+Busaboy1103 Its ok the r34 doesn't need it as much as dougs r32 have you seen the wing they came with from the factory? That's at least 80hp right there
the car has the wastegate restriction removed. its a small piece of metal inside the vacuum hose that goes to the wastegate. once removed the car goes from 10psi to 14 psi and 276 hp to around 320, or exactly whats shown here
An unrestricted wastegate wouldn't add almost 50HP, and certainly not 4psi. Especially on stock boost. Maybe if he had a aftermarket boost controller, but four psi isn't going to jump that much in difference
correct...once you remove that,you need a boost controller to control boost.Free boosting on an turbo car is a disaster waiting to happen.BPU make the boost go to 14psi.
+BCJDM If you're talking about *que the ominious music, lightning flash, rain, the lights going out* THE LETTER!!!!!!!!!!!!! *que dramatic sting*, it's kinda a myth.
+threefortyduster Which is kinda ridiculous imo. There are cars like the RS6 with 560hp which would easily run 300+kph (186mph) but they limit them because of safety issues. You can barely go 155mph on the Autobahn when there's traffic so why limit them at that speed?
+UA-cam Li If it's low mileage, it wouldn't have lost nearly as many as you think. If you take a 20 year old Alpha Rome that has been a daily, and it had 150 horsepower at stock, it will most likely have no more than 120 now.
BNR32's stock exhaust was incredibly restrictive. Adding a larger exhaust definitely adds a fair amount of power and it was one of the most common mods on them. If your RB26 has not been rebuilt since it was made then it is definitely down on power and the exhaust is equaling everything out back to stock horsepower figures.
+OmegaEGGY Well actually there is a vid of a NSX here in the Netherlands. It does have a different exhaust. It scored 350 Horsepower and 355 Nm. So that's 70 horsepower more. It's in well.. Dutch haha /watch?v=U4qIRmaF264
+Tedlasman No awd S54 powered vehicles were made. The other 3 engines are torquey engines that didn't need be wound out to 8300 to make power due to having turbo(s). The area under the hp curve is bigger due to the large torque making them feel quicker, especially around town. The S54 has a super flat torque curve delivering power very linearly and not making peak power all the way until around 8000 or so.
+XenomorphLV426 Move to Australia mate! We get all types of cool JDM cars. Later MK4 Supras, Skylines (R32-34), S15 Silvia's. you name it. The only riced out cars you see are the base model lancers from the late 90's pretending to be Evo's.
+Eggly Bagelface Yep. All too often you see a guy (sometimes a girl, only because it's her boyfriends car) with a sixth gen lancer with an enormous wing and body kit, much like the sixth gen evo which came from the factory with a huge wing on the back.
+XenomorphLV426 It still is considered to be amazing and the R32 is legal in the states as well. I have a 96 R33 that i plan to take back in 2021 when its legal.
um no.......it depends on the power output. if the car had 1hp. do you think it would move? if it had 2000whp, do you think it would loose 450hp to the drivetrain? hell no..... to use generic % is dumb. it depends on the power level of the car in order to determine the ratio of power loss
Ummm... if a car had 2000whp, it would have exactly that, 2000 WHEEL horsepower. We are talking about crank horsepower compared to wheel horsepower. If a car has 2000bhp through an AWD drivetrain it would loose the same amount of power per ratio (ex 22percent) The amount of power the engine makes/doesn't make does not exempt it from drivetrain loss genius
Considering the importer guessed 320, it sounds as if that is a standard HP rating throughout the line. Would be difficult to estimate loss over time that accurately, unless they all lose HP at a fairly predictable rate. But still, that guess was spot on.
Ok firstly I love all your vids Doug, but as a GTR know-it-all I'm going to post these things... American dynos.. vs Australian etc, yours read higher. Catback on a 32 GTR actually does give you more power than you'd think. Also im 99.1% sure the boost restrictor will have been removed by now. The stock PSI is 7-8. You'll be running 14psi to achieve those numbers. Factory figures are based on 7-8psi with the restrictor in. If you do nothing else but get a proper dyno tune and run it at 14psi (generally regarded safe limit for factory turbos), you will see 330-340awhp (aus dyno), so about 370-400awhp american dyno. Cheers!
+Ash Ketchum totally hearing what your saying. boost restrictor and exhaust is easy 200kW+ GTR add PFC and tune 220kW+ My Standard R32 GTR in full standard trim standard intake and exhaust. 142kW (190hp) @6667rpm: boost 6.7psi and with boost restrictor removed 178kW (238hp) @6656rpm hitting 10.3psi.
+Ash Ketchum Dude.... its all about how power is calculated and the model of dyno used. This was likely ran on a Dynojet Dyno, which is known as the "Hopes and Dreams" dyno. Had it been run on a Mustang dyno aka "Heartbreaker" dyno, it would read a lot lower than 281AWHP. And the conversion rate between kW and HP is high enough to assume one countries dyno's read better or worse than anothers. IIRC, the difference is usually 10-13% which can be attributed to HOW the dyno's interpret the power being made.
Dynos vary depending on type. If by "American" dynos you mean Mustang dynos, then you're correct. But not all dynos in America are mustang dynos. Also, this was not a catback exhaust mod, it was a muffler mod. It sounds like that boost restriction made all the difference.
the first car that got marketed under the 276hp limit was the Nissan 300ZX Z32 turbo that already exceeded 300hp in reality. So it is not surprising that the later R32 also exceeds the 300 mark. but good to see this confirmed once and for all! :)
Doug, Your exhaust may not contribute 50hp, but if you see a standard R32 exhaust and how small a diameter it is, an aftermarket exhaust could add 20 - 30 hp. It all depends if it's just a tail pipe, complete exhaust and what sort of cat it has. When my 32 was stock, (16 years ago), I had a complete HKS exhaust and removed the cat and got 370 crank hp still on the stock boost. Now, I'm not saying for one minute Nissan 276hp was anywhere near realistic, but the RB26 loves to breath. Keep up the great blog, it reminds me of when I first got my R32 in the UK back in '97 and how everyone wanted to know about it. Regards, Scott. Secretary and confounded of the GTROC. The only official Nissan recognised GTR club in the world.
Any dyno vid with posted numbers now days deserves a like.BTW,AWd is higher at drivetrain loss. To add,that thing puts down 330-350 at the crank easily. This thing was an underrated beast. Awesome. Most boosted cars tend to be. Still awesome
Here in Brazil they usually do it on some sort of cars. Less power = less taxes regarding poluents and stuff like that. 2015 VWGolf GTI por example. 220 hp on the paper, 260+ on the dyno. Turbo BMWs are the same history. And about your results, possibly it lost some hp during the years, so it may probably have had even more hp back in the days. Really badass car! Congrats Doug!
+Lucas Almeida my MK4 1.8T 5 speed at APR Tuning made 177hp and 190lbs stock at the wheels, for a car rated at 180hp and 176lbs, after tuning i left with 234 at the front wheels. I mean not all cars are like the skyline, or the GTI, or the 1.0L 3 cylinder 2015 Ford ecoboost, which on paper is around 120hp but dynos are showing 145-150hp
I think it's actually the modified exhaust that LIBERATES the extra power. Earlier R32 GT-Rs did indeed make ~280hp stock, but the stock exhaust was deliberately undersized to restrict the engine's true power. Later R33s and R34s got slightly modified turbochargers and the 280hp advertised was in-name only. In fact later, a Nissan engineer did reveal the late R34 GT-R in stock trim (with the choke-the-power out of it stock exhaust) is around ~330hp. Put on a decent exhaust and the power jumps easily to 360~370hp.
wow very interesting! great video. I live in utah, elevation is around 4,700 ft to 5,300 I love when people say there stock wrxs are 225HP. on the dyno here a bone stock wrx is around 160/175WHP. I put 303whp down in my 98 gsx dsm and people say that's it??? that's it!? that's alot!
I was told Skylines always had airflow-limiting exhausts from factory. They did it so they could tune-up the engine while staying close to the quoted figures, but allowed for anybody to rotate out the exhaust and up the power.
When the Skyline was on the dyno I could hear an engine sound that sounded like how the Skyline sounds when you drive it (stock that is) in Gran Turismo 2, 3, 4, etc. AWESOME!
You are partially right about the gains of exhaust mods on this car, because the R32 GTR has a RB26 twin turbo motor which is hugely tuneable, I have once remembered an edition of Top Gear magazine said an exhaust can already helped the R32 getting 320bhp so it is possible. PLUS honda civic are naturally aspirated cars so the gains are much less beacuse no turbo to force the exhaust gas to come out, while THE R32 has twin turbo, greater flow more power. PS you also have an aftermarket intercooler! Love the show!
They'll make around what you're quoting with even a clean flowing standard exhaust but they MUST have the factory installed olive restricter removed from the factory boost control hose. You'll see a yellow stripe printed around the hose close to the factory boost control valve that is bolted just in front of the driver's side shock tower. Squeeze the hose at the stripe..... Feel a little brass olive inside the hose? If not, there's your power gain. All the press cars had them removed "back in the day".
Hmmm pretty suspicious that the dyno figures didn't change after the engine's components were heatsoaked, not to mention that he didn't actually show us the figures... just read them out>>>> SKETCHY
the reason for the higher horsepower is most likely that a previous owner removed an inch of tubing going into the waste-gate actuator. if you cut that off, you can see a restrictor in the tube, wich is part of the agreement to lower the HP.
Im sorry, but there is more to it than this story lets on. Real GTR fanboys like myself would know that R32's came with a restrictor valve in the wastegate plumbing that restricts the car to 10psi stock (and about 280bhp). Simply by removing that valve brings the car up to 14psi (320+bhp). SINCE the previous owner did the aftermarket exhaust, I GUARANTEE that he did the 14psi mod, people with bone fucking stock R32's do that before they ever think of modding the car. Also, the exhaust is probably good for about 20whp and 40lb/ft torque to a bone stock RB26DETT. Sooo, that puts him around 370bhp, then factor in around 15%-20% drivetrain loss.. you get around 300whp. Factor in the hp lost due to engine wear and youre about 270-280whp, like the video states. GTR's can make 280 whp "bone-stock" but only with the 14psi mod.
You have to remember that different dyno's will give you different numbers and an exhaust on a turbo car is very different to NA, better flowing exhaust means the turbo's will run more boost which means more power.
You need to consider the OEM boost restrictor it had fitted from the factory, once removed it will produce slightly higher peak boost. it was a yellow ring that most owners ripped first thing they díd, feel free to google and you will find out this is the reason for about 50 more bhp with exhaust.
+fakethinkpad I have a 1990 Skyline R32 as well that is "stock accept for an exhaust" that I purchased a few months ago. I removed the boost restrictor prior to the dyno and I got 319 at the wheels on the first pull. The car just flat out has more horse power than advertised. Which *totally* sucks. ;)
+Alex Stern The germans have a diferent reasoning for underselling because of PS units. PS units obviously come from metric system but the germans also use it to confirm that the car is rated to achieve that level in poor operatin conditions like alititue and temperature. When the vehicle is running in optimal conditions like sea level on a cold day and warmed up fluid, most vehicles perform beyond it's PS rating.
+Alex Stern You don't mean 2008. In 2008 the M3 had the S65, a 4L V8. You probably mean the S54, the 01' to 06' M3. The 335i has the n54 or the n55 depending on model year, same engine that's in my car. It doesn't make anywhere near 400bhp. It's accurate at a little over 300hp and 300tq.
+SnipinCatz they did dyno tests of early n54 cars and they put 300hp at the wheels. BMW turned the power down because of the M3 and the high pressure fuel pumps. My car has had about six fuel pumps all under the extended warranty.
Mr335iBMW Being detuned is not the same as the stock crank hp being wrong. Nearly all the modern turbo engines run well below what they could. BMW gave an accurate figure. A stock 335i is not running much above or below 300tq and 300hp.
One important question: how much boost pressure did you run? Stock R32's came with ~276 hp at 0.7 bar (~10psi) , and that pressure was (only) physically restricted with nipple on the wastegate actuator. If the restriction was pulled off from the actuator intake hose (pretty easy thing to do), you would get almost 1 bar (~14psi) of boost pressure, and that would give you ~50hp increase, and there's your current ~320hp . :)
When the back wheels spin and the front do not, the clutch packs engage and spin the front tires accordingly. If the front and rear wheel speeds match then the AWD willl disengage and it will be a RWD car.
Those cars were made at a time where they were all limited to 276hp by law, and the competition was fierce, so they were trying to understate their car's power instead of overstating it, because they wanted to fit as much power as they could while staying within the law.
You are a car guy but you are bad at maths XD It doesn't produce 323 but 330. Because you are supposed to get the 15% of the engine's horsepower which is different than the 15% of the wheels' horsepower. ;P
The famous yellow marked hose with the boost restrictor in it. Majority of the gtr's have them removed now but when they came out it would keep the horsepower down alot, once removed you feel a big difference. Even the R34-gtr in the intake on the side of the airbox there is like a large plug, once you remove that you get an extra air intake for the stock airbox plus better intake sounds haha.
I love how nobody's commenting on the fact that these cars actually DO make 276HP from the factory. Nissan installed a boost restrictor that limited the car to 0.7 bar of boost, about 10 PSI. Nissan highly encouraged their owners to remove this restrictor to unlock the full 1.0 bar/14.7 PSI that the motor was designed for, bumping power to about 320HP. it only takes about 5 seconds to remove the restrictor. it's stuck in a boost line and you just cut it off to unlock all that power. Matt Farah covered this in his review.
Super impressive! What a gem. Can't believe how old and yet still kick ass these cars are. God damn the Japanese knew how to make bullet proof cars back in the 80's-early 2000's. These days? I don't know anymore. R34 wheels? They look good on the 32.
I'm not surprised as I've read for years the R32 and R33s made 320 crank hp and the R34 made 340 but it is great to go beyond print and see real world dyno figures :)thnx for the vid
Hey Doug, does the dyno results show the boost pressure that the car was reaching during the runs? one of the ways these cars were capped from factory is from a restrictive exhaust system. This leads to a back pressure which can limit the boost slightly and an aftermarket exhaust in the case of the GTR can actually add 30-40Hp from simply bolting it on and freeing up the exhaust to build slightly more boost. Regards A fellow awesome R32 GTR driver.
What makes it more interesting is the age of the car. Factor in your mileage (and that its 25 years old), plus (a more realistic) +20% drive train loss. Thats why these cars are so sought after.
Did you check for the stock boost restrictor (marked in yellow on tube in drivers front of engine bay) ? Removing that banjo restrictor should bring you up to 1 bar of boost so if its not currently there that would explain the increased amounts of power. They used that restrictor to fall in line with gentlemans agreement.
Close to 310 is the real figure for R32, 320 for R33, 330+ for R34, 330 for Supra, 320 for 3000GT. Evos and STIs were over 280PS from 1997 and forward.
the stock exhaust may have been designed to restrict it. possibly to comply with emissions. Ford restricted the intake tube on their turbo escort in a similar way. So people would upgrade the intake and gain 30hp or so
Has the factory boost restrictor been removed? Nissan put a little plastic restrictor in the line marked with a bright yellow ring right before the boost solenoid, taking this out gives an instant 40 hp increase courteousy Nissan. This is why most r32s are about 320 in stock form.
Between the exhaust, the front mount intercooler and whatever other little things could have been tweaked over the years it's definitely possible to have picked up 50hp. The RB26 is a beast locked in a cage anything that removes restriction unleashes horsepower. And Nissan added plenty of those in the first few years.
15% is actually a pretty low driveline loss for AWD. 15-20% is a good measuring stick. I generally use 18% when using Mustang 1100-SE Dyno (which is similar to what is used at AWE). Which actually means at the crank you're putting about 340hp down... With that said, 320-340hp sounds about right. Some dynos, like DynoDynamics can take that full 20%. I've done a dyno 'year' where I tried a few dynos in the same car. I found that Dyno Dynamics can be a driveline loss of 18-20, DynoJets can be 12-15 and Mustangs can be 15-18 for an AWD car. Can't go wrong with 15% though if you want to keep your numbers sounding less inflated. I always tell people that if you're going to quote 'crank horsepower' based on your wheel horsepower, do a range. 15-18% "Yeah, it made 281whp on a Mustang dyno, so that's anywhere between 320 and 340hp at the crank." sounds a lot better than "yeah dude, it makes 350 crank hp!"
+chapel976 on a side note - it also depends on the dyno shop. I brought my BONE STOCK 97 328i (192bhp) to a dyno once... they ran it a few times and each time it made 190whp or more... I'm pretty sure their dyno was broken or they didn't know how to use it.
True the exhaust doesn't add 50 hp but I'd say it adds around 25hp the put a restrictive exhaust from the factory so a custom one does a lot more than usual
the dyno is seem to be right here but i think he needs to check the ECU settings for any changes. Just to be sure he should have reflash the ECU back to factory settings. also there is a boost controller limiter under the glove compartment. Removing it will allow the boos limit to be raised. later models of the Skylines could gain around 400BHP just from doing basic stage 1 tuning
As mentioned, Toyota, Nissan, and Mazda all maintained a 276 hp limit from the factory with the Japanese government. The cars were however capable of much more, as demonstrated by this video, and the lower power was made by way of a restriction in the vacuum tubing to the wastegate actuator. Toyota and Nissan both clearly marked this restriction in the line with yellow tape so the owner could remove the restriction and enjoy a boost of 50+ hp right off the lot. There was never any rules that stated the owner couldn't make more than 276, just a gentleman's agreement from the manufactures that they wouldn't. As for people wondering if their N/A Sentra is understated, don't get your hopes up, this was only for the big performance cars like the Supra, Skyline, RX-7, etc.
Be interesting to see what boost this is running, compared with stock? I wouldn't be surprised if the ECU was modified too. Something you couldn't tell to look at. Looks like a good example there though!
I am sure people have mentioned it like a thousand times... but, what brand dyno was that? There is low reading, high reading, and in between/correct. The difference between a low reading and a high reading can be as much as 30%. Yes! 30%! So, you might see 300hp on one and 200hp on another... from what the video shows, I would say it is a Dynojet, which is the correct reading dyno. The dynapack, which people like to say is correct, is not reading power at the wheels, it's reading it after you remove the wheels and bolt on the dyno.. which means it will give higher readings, as much as 30% over the lowest reading. The lowest reading is the Mustang Dyno. The in the between, would be the correct reading, which is what SAE uses when a car is produced and presented to them for testing to give a rating and/or limits to what can be stated. That would be a Dynojet, which is what i think you used from looking on the video. There is sooo many brands out there, and there is chinese brands also, which are really poor quality machines, with readings all over the place from one to another and even on back to back runs.
I actually read that the real rating was 350HP but was really illegal so they made it to 276HP but everyone knew about it that's why this guys is still the BEAST during it's prime.
I have not been reading through all comments, myabe it is already mentioned? However, what boost is the car running right ow, stock is around 0.7-0.8 bar right? Is the restrictor removed, wich increase the boost to about 1-1.1 bar? This restrictor was "meant" to give around 320 hp if im not mistaken. Even the hose is marked with a yellow stripe so it was easy to find the restrictor.
Oh lets not forget that there's a known difference between American dynos and whatever else too. Not sure how much difference it accounts for but it does exist. Will have to look into it.
so I'm going to add my two cents based on things I know, for one changing the muffler with one that flows better can actually increase boost at higher rpms where horsepower peeks especially older cars, and another thing is that this car has atteza-ets when you get going on the road and you don't have rear wheel slip all power goes to the rear wheels increasing its efficiency by reducing drive train loss until it it slips then then splits up to 50% power to the front wheels, you can just pull a fuse to disable this system and use a 2 wheel dyno and get a more accurate reading, and 15% power loss through the drive train is purely a rule of thumb.
Think about it, gentlemens law from classic Japanese times. It limited anything over 300mph so makers started to claim below those numbers to get away with it and give us high powered, fun cars. Hope that helps in a logical way!
the thing is, that all the Japanese horsepower rates are underrated due to the government agreement which was taken down on '99 I think, which limited the max. horsepower to 280. All the cars had theoretically 280, but practically little bit more. Same goes for JDM Supra TT for instance.
also to give more info on a Mustang dyno 280+whp is more then a regular dyno jet which is what most people use and this on a dyno jet would dyno 300+whp. Also if it's a awd skyline it's more then 15% loss. It's closers to 20% due to having more drivetrain.
Sounds very accurate for a bone stock r32 gtr with exhaust. You may have got a higher figure using rear wheel drive only. GTR, Supra Rz, Mitsubishi GTO(3000gt),Soarer etc all have around 320 at the flywheel. The Gentleman's agreement explains why US 3000gt was rated at 320hp but exact same engine in Japan was rated at 276hp
is your boost restrictor still in ? the BNR32 came with one (mine was when i got my gtr, so its been on stock boost all its life.) Usually they've been removed from previous owners. Its rare for a BNR32 to have them in now days. Nissan actually labeled where the restrictor is so people could remove it and have a bump in HP. If yours isn't in, it's not running stock boost level.
Well it's nice they measured three times the same power on the wheels... but shouldn't the power decrease the more times you measure because the car gets hotter? The first run should be the best when the car is moderately warmed up before, right?
The reason for the increase is probably due to the build up of carbon deposits in the cylinders therefore creating a higher compression during combustion. It's not that uncommon to have more hp over time because of the build up if the car is taken care of.
Rims arent stock, the clearly produce 50 hp duhh
+Jonathan Long R34 rims.
VirusTornado I know they are, i would recognize those rims from anywhere
+Jonathan Long man, I feel bad for that R34, they took away its 50hp and added that to the R32.
+Busaboy1103 Its ok the r34 doesn't need it as much as dougs r32 have you seen the wing they came with from the factory? That's at least 80hp right there
+Paul T the gtr badges add like 69hp
the car has the wastegate restriction removed. its a small piece of metal inside the vacuum hose that goes to the wastegate. once removed the car goes from 10psi to 14 psi and 276 hp to around 320, or exactly whats shown here
yup
yup, most of them supposedly have that removed too
An unrestricted wastegate wouldn't add almost 50HP, and certainly not 4psi. Especially on stock boost. Maybe if he had a aftermarket boost controller, but four psi isn't going to jump that much in difference
correct...once you remove that,you need a boost controller to control boost.Free boosting on an turbo car is a disaster waiting to happen.BPU make the boost go to 14psi.
did they talk about that on another video or are you assuming as its a common mod and the numbers seem correct?
It's really rare to see a company understate the power of a car.
yeah
+Barnacules Nerdgasm Ohhh damn barnacules is a doug demuro fan !! :)
+Barnacules Nerdgasm It also occurred during the muscle car years in America, as insurance companies charged really high rates to really high HP cars.
+Lars Bolduc which led to some monstrous horsepower numbers, chevy was the king of fudging the numbers.
Things are different in Japan
Doug is a lot different from other car UA-camrs.. I think that's why I like him haha
+Zach Pennington His content is well thought out, and he comes across as a great guy. I agree with you.
+Jonathan Leack I used to think he was a pretentious douchebag. He seems nine actually
+omar khan He must be a big nine year old
+Claudia Haggerty I meant nice hahaha
+Claudia Haggerty LoL!
Interesting, the Japanese manufacturers also had a similar gentlemans agreement went it came to motorcycles.
+BCJDM Who needs to go over 186mph anyway?
+Ford RS That's why the Germans had a gentleman's agreement to limit their cars to 155 :)
+BCJDM If you're talking about *que the ominious music, lightning flash, rain, the lights going out* THE LETTER!!!!!!!!!!!!! *que dramatic sting*, it's kinda a myth.
+BCJDM The gentleman's agreement on motorcycles is still in use at 299km/h
+threefortyduster Which is kinda ridiculous imo. There are cars like the RS6 with 560hp which would easily run 300+kph (186mph) but they limit them because of safety issues. You can barely go 155mph on the Autobahn when there's traffic so why limit them at that speed?
You also need to take into account that engines loose horsepower over the years.
+UA-cam Li Yeah this car 25+ years old. Yet still has 281AWHP. dafuq?
+VirusTornado Japanese what you expect
+UA-cam Li Happens less with wastegated turbo cars, though, unless they have been run hard and long. But Japan frowns on high mileage.
+UA-cam Li If it's low mileage, it wouldn't have lost nearly as many as you think. If you take a 20 year old Alpha Rome that has been a daily, and it had 150 horsepower at stock, it will most likely have no more than 120 now.
+UA-cam Li German cars kinda don't.
They're so over-enginered that they feel brand new 10 years later.
also you can't forget about the power loss over time when the engine was new it probably made much more...
Much more? Nah lol maybe 10 tops
Jdm fans after seeing the title
“Uhh obviously 3000 hp”
10,000hp*
@@shohamroshan lol
BNR32's stock exhaust was incredibly restrictive. Adding a larger exhaust definitely adds a fair amount of power and it was one of the most common mods on them. If your RB26 has not been rebuilt since it was made then it is definitely down on power and the exhaust is equaling everything out back to stock horsepower figures.
moezep well no first of all you have to change the whole system not the tip also even so it's not going to add 40+ HP
Now I want to know how much power the other Japanese cars of the time had. Evo, RX-7, Supra, NSX, you name it.
I think RX-7's make around 225-230WHP stock
+OmegaEGGY C30A in NSX(manual) makes ~250whp
+OmegaEGGY 3000GT VR4, R34 V-Spec II, Supra TT. Those are the ones I would expect to have the biggest numbers...
Martin Espinoza
Yeah, with their twin-turbo 6-cylinders and all. I'm betting that they push out at least 350 at the crank.
+OmegaEGGY Well actually there is a vid of a NSX here in the Netherlands. It does have a different exhaust. It scored 350 Horsepower and 355 Nm. So that's 70 horsepower more. It's in well.. Dutch haha /watch?v=U4qIRmaF264
Seriously? BRB selling my STI for one of these
Get a n54 powered car instead. Make 400 whp with $100 in mods.
Bryan Kendall I'd rather have an S54
ravesilly The S54 is an amazing engine, though completely different type of engine from an EJ25, RB26 or N54.
+Bryan Kendall Such as? were there any awd variants released?
+Tedlasman No awd S54 powered vehicles were made. The other 3 engines are torquey engines that didn't need be wound out to 8300 to make power due to having turbo(s). The area under the hp curve is bigger due to the large torque making them feel quicker, especially around town. The S54 has a super flat torque curve delivering power very linearly and not making peak power all the way until around 8000 or so.
Nissan was the shit in the 90's. Too bad we never got to see these beasts in the U.S., and instead got stuck with shitty Honda's with fart cans.
Japanese crafting level: 99.
Add me gnome child.
WithMyWhoas
+XenomorphLV426 Move to Australia mate!
We get all types of cool JDM cars. Later MK4 Supras, Skylines (R32-34), S15 Silvia's. you name it.
The only riced out cars you see are the base model lancers from the late 90's pretending to be Evo's.
+Banana Split You have those?
The riced Lancers, I mean.
+Eggly Bagelface Yep. All too often you see a guy (sometimes a girl, only because it's her boyfriends car) with a sixth gen lancer with an enormous wing and body kit, much like the sixth gen evo which came from the factory with a huge wing on the back.
+XenomorphLV426 It still is considered to be amazing and the R32 is legal in the states as well. I have a 96 R33 that i plan to take back in 2021 when its legal.
Wow, not what I expected. I love older sports cars and imports.
Looks like little dougy got one hell of a deal.
AWD is usually more like 20-22% drivetrain loss
+Pill Baxton Up to 30+% for an automatic.
Justin Updyke Agree, good point
+Pill Baxton The GTR's are well known to lose an extra 12% in AWD mode than when measured in RWD mode.
um no.......it depends on the power output. if the car had 1hp. do you think it would move? if it had 2000whp, do you think it would loose 450hp to the drivetrain? hell no..... to use generic % is dumb. it depends on the power level of the car in order to determine the ratio of power loss
Ummm... if a car had 2000whp, it would have exactly that, 2000 WHEEL horsepower. We are talking about crank horsepower compared to wheel horsepower. If a car has 2000bhp through an AWD drivetrain it would loose the same amount of power per ratio (ex 22percent) The amount of power the engine makes/doesn't make does not exempt it from drivetrain loss genius
Keep in mind that's a 25 year old car. I bet you it could make 350 crank with a brand new factory stock engine.
Considering the importer guessed 320, it sounds as if that is a standard HP rating throughout the line. Would be difficult to estimate loss over time that accurately, unless they all lose HP at a fairly predictable rate. But still, that guess was spot on.
Ok firstly I love all your vids Doug, but as a GTR know-it-all I'm going to post these things...
American dynos.. vs Australian etc, yours read higher.
Catback on a 32 GTR actually does give you more power than you'd think.
Also im 99.1% sure the boost restrictor will have been removed by now. The stock PSI is 7-8. You'll be running 14psi to achieve those numbers. Factory figures are based on 7-8psi with the restrictor in.
If you do nothing else but get a proper dyno tune and run it at 14psi (generally regarded safe limit for factory turbos), you will see 330-340awhp (aus dyno), so about 370-400awhp american dyno.
Cheers!
+Ash Ketchum totally hearing what your saying. boost restrictor and exhaust is easy 200kW+ GTR add PFC and tune 220kW+
My Standard R32 GTR in full standard trim standard intake and exhaust. 142kW (190hp) @6667rpm: boost 6.7psi and with boost restrictor removed 178kW (238hp) @6656rpm hitting 10.3psi.
Agreed American dynos seem all shit
+Ash Ketchum Dude.... its all about how power is calculated and the model of dyno used.
This was likely ran on a Dynojet Dyno, which is known as the "Hopes and Dreams" dyno. Had it been run on a Mustang dyno aka "Heartbreaker" dyno, it would read a lot lower than 281AWHP.
And the conversion rate between kW and HP is high enough to assume one countries dyno's read better or worse than anothers. IIRC, the difference is usually 10-13% which can be attributed to HOW the dyno's interpret the power being made.
Conversion from kW to HP is fixed, its a number (1hp = 3/4kw).
Dynos vary depending on type. If by "American" dynos you mean Mustang dynos, then you're correct. But not all dynos in America are mustang dynos.
Also, this was not a catback exhaust mod, it was a muffler mod. It sounds like that boost restriction made all the difference.
the first car that got marketed under the 276hp limit was the Nissan 300ZX Z32 turbo that already exceeded 300hp in reality. So it is not surprising that the later R32 also exceeds the 300 mark. but good to see this confirmed once and for all! :)
Sneaky Nissan
Now people from the U.S will finally understand / experience why the GT-R bloodline is legendary and almost considered Japan's national sportscar. ;)
Doug,
Your exhaust may not contribute 50hp, but if you see a standard R32 exhaust and how small a diameter it is, an aftermarket exhaust could add 20 - 30 hp. It all depends if it's just a tail pipe, complete exhaust and what sort of cat it has.
When my 32 was stock, (16 years ago), I had a complete HKS exhaust and removed the cat and got 370 crank hp still on the stock boost.
Now, I'm not saying for one minute Nissan 276hp was anywhere near realistic, but the RB26 loves to breath.
Keep up the great blog, it reminds me of when I first got my R32 in the UK back in '97 and how everyone wanted to know about it.
Regards,
Scott.
Secretary and confounded of the GTROC.
The only official Nissan recognised GTR club in the world.
Any dyno vid with posted numbers now days deserves a like.BTW,AWd is higher at drivetrain loss.
To add,that thing puts down 330-350 at the crank easily. This thing was an underrated beast. Awesome. Most boosted cars tend to be. Still awesome
When my GTR (89, R32) was dynoed in completely stock form (including exhaust) it came out with a consistent 276 to the ground. Hmmmm....
Here in Brazil they usually do it on some sort of cars. Less power = less taxes regarding poluents and stuff like that.
2015 VWGolf GTI por example. 220 hp on the paper, 260+ on the dyno. Turbo BMWs are the same history.
And about your results, possibly it lost some hp during the years, so it may probably have had even more hp back in the days. Really badass car! Congrats Doug!
+Lucas Almeida my MK4 1.8T 5 speed at APR Tuning made 177hp and 190lbs stock at the wheels, for a car rated at 180hp and 176lbs, after tuning i left with 234 at the front wheels. I mean not all cars are like the skyline, or the GTI, or the 1.0L 3 cylinder 2015 Ford ecoboost, which on paper is around 120hp but dynos are showing 145-150hp
You remind me a lot of Jay Leno :D
+iKebabHD A little bit.
+iKebabHD i could see that..
More like quagmire.
I think it's actually the modified exhaust that LIBERATES the extra power. Earlier R32 GT-Rs did indeed make ~280hp stock, but the stock exhaust was deliberately undersized to restrict the engine's true power.
Later R33s and R34s got slightly modified turbochargers and the 280hp advertised was in-name only. In fact later, a Nissan engineer did reveal the late R34 GT-R in stock trim (with the choke-the-power out of it stock exhaust) is around ~330hp. Put on a decent exhaust and the power jumps easily to 360~370hp.
wow very interesting! great video. I live in utah, elevation is around 4,700 ft to 5,300
I love when people say there stock wrxs are 225HP. on the dyno here a bone stock wrx is around 160/175WHP. I put 303whp down in my 98 gsx dsm and people say that's it??? that's it!? that's alot!
I was told Skylines always had airflow-limiting exhausts from factory. They did it so they could tune-up the engine while staying close to the quoted figures, but allowed for anybody to rotate out the exhaust and up the power.
Are you a congress member...? what's with the license plate?
+MegaHitsGaming Pretty sure he put that there as a joke reference to his story about getting pulled over twice because of his actual plates.
Ohhh, right! I completely spaced XD
Although, I can totally see Doug as a Congress member.
+Comedic Sketches Doug is Deez Nuts
When the Skyline was on the dyno I could hear an engine sound that sounded like how the Skyline sounds when you drive it (stock that is) in Gran Turismo 2, 3, 4, etc. AWESOME!
Can't wait to import an R34, I think it'll pair sweet with my R/T😍
Ro Formance It will!
I want this car. I love how small and thin and Japanese it looks. Im also a Nissan fanboy so there is that. lol
You are partially right about the gains of exhaust mods on this car, because the R32 GTR has a RB26 twin turbo motor which is hugely tuneable, I have once remembered an edition of Top Gear magazine said an exhaust can already helped the R32 getting 320bhp so it is possible. PLUS honda civic are naturally aspirated cars so the gains are much less beacuse no turbo to force the exhaust gas to come out, while THE R32 has twin turbo, greater flow more power. PS you also have an aftermarket intercooler! Love the show!
Doug Demuro ; the type of guy who would be upset if his car turns out more powerful than on the paper.
They'll make around what you're quoting with even a clean flowing standard exhaust but they MUST have the factory installed olive restricter removed from the factory boost control hose.
You'll see a yellow stripe printed around the hose close to the factory boost control valve that is bolted just in front of the driver's side shock tower. Squeeze the hose at the stripe..... Feel a little brass olive inside the hose? If not, there's your power gain. All the press cars had them removed "back in the day".
Not sure how you got your horsepower number .
281/0.85= 330hp
Your math doesnt work out.
323 * 0.85 = 274.5
It's also amazing that this car has gotten old and it still puts down this kind of power!
Hmmm pretty suspicious that the dyno figures didn't change after the engine's components were heatsoaked, not to mention that he didn't actually show us the figures... just read them out>>>>
SKETCHY
the reason for the higher horsepower is most likely that a previous owner removed an inch of tubing going into the waste-gate actuator. if you cut that off, you can see a restrictor in the tube, wich is part of the agreement to lower the HP.
Im sorry, but there is more to it than this story lets on. Real GTR fanboys like myself would know that R32's came with a restrictor valve in the wastegate plumbing that restricts the car to 10psi stock (and about 280bhp). Simply by removing that valve brings the car up to 14psi (320+bhp). SINCE the previous owner did the aftermarket exhaust, I GUARANTEE that he did the 14psi mod, people with bone fucking stock R32's do that before they ever think of modding the car. Also, the exhaust is probably good for about 20whp and 40lb/ft torque to a bone stock RB26DETT. Sooo, that puts him around 370bhp, then factor in around 15%-20% drivetrain loss.. you get around 300whp. Factor in the hp lost due to engine wear and youre about 270-280whp, like the video states. GTR's can make 280 whp "bone-stock" but only with the 14psi mod.
An almost completely stock GT-R, you don't see that every day.. It's really cool that these engine produce way more hp than written in the specs.
'member of congress' license plates... nice!
+audioh0lic saw that too, but I'm assuming he covered up his real plates with that one to foooool us!
You have to remember that different dyno's will give you different numbers and an exhaust on a turbo car is very different to NA, better flowing exhaust means the turbo's will run more boost which means more power.
3:07 DAMN it's sexy!
You need to consider the OEM boost restrictor it had fitted from the factory, once removed it will produce slightly higher peak boost. it was a yellow ring that most owners ripped first thing they díd, feel free to google and you will find out this is the reason for about 50 more bhp with exhaust.
+fakethinkpad I have a 1990 Skyline R32 as well that is "stock accept for an exhaust" that I purchased a few months ago. I removed the boost restrictor prior to the dyno and I got 319 at the wheels on the first pull. The car just flat out has more horse power than advertised. Which *totally* sucks. ;)
Same story with my 335i. Not as much of an exaggeration but close.
+Alex Stern The germans have a diferent reasoning for underselling because of PS units. PS units obviously come from metric system but the germans also use it to confirm that the car is rated to achieve that level in poor operatin conditions like alititue and temperature. When the vehicle is running in optimal conditions like sea level on a cold day and warmed up fluid, most vehicles perform beyond it's PS rating.
Neojhun Right yea I've heard that too. Also I think back in 2007 the 335 was getting too close to the 2008 M3 power.
+Alex Stern You don't mean 2008. In 2008 the M3 had the S65, a 4L V8. You probably mean the S54, the 01' to 06' M3. The 335i has the n54 or the n55 depending on model year, same engine that's in my car. It doesn't make anywhere near 400bhp. It's accurate at a little over 300hp and 300tq.
+SnipinCatz they did dyno tests of early n54 cars and they put 300hp at the wheels. BMW turned the power down because of the M3 and the high pressure fuel pumps. My car has had about six fuel pumps all under the extended warranty.
Mr335iBMW
Being detuned is not the same as the stock crank hp being wrong. Nearly all the modern turbo engines run well below what they could. BMW gave an accurate figure. A stock 335i is not running much above or below 300tq and 300hp.
One important question: how much boost pressure did you run?
Stock R32's came with ~276 hp at 0.7 bar (~10psi) , and that pressure was (only) physically restricted with nipple on the wastegate actuator.
If the restriction was pulled off from the actuator intake hose (pretty easy thing to do), you would get almost 1 bar (~14psi) of boost pressure, and that would give you ~50hp increase, and there's your current ~320hp . :)
15% lost for four-wheel drive car? I thought it would be more.
肖博诣 it's not an all time AWD it only powers the front wheels when you lose grip
It is AWD, just an rear wheel drive bias AWD.
Uh, did you not see the front wheels spinning?
acalthu that's because it's on a AWD dyno
When the back wheels spin and the front do not, the clutch packs engage and spin the front tires accordingly. If the front and rear wheel speeds match then the AWD willl disengage and it will be a RWD car.
Those cars were made at a time where they were all limited to 276hp by law, and the competition was fierce, so they were trying to understate their car's power instead of overstating it, because they wanted to fit as much power as they could while staying within the law.
You are a car guy but you are bad at maths XD
It doesn't produce 323 but 330. Because you are supposed to get the 15% of the engine's horsepower which is different than the 15% of the wheels' horsepower. ;P
9Tech no, 15% is for automatics
9Tech whoops. I forgot the awd
exactly, he multiplied 281 by 1.15, when in fact, you are supposed to divide 282 by 0.85, which gives you 330
yes Yusuf is 100% correct. you divide by .85 to get the correct number.
He was off by 7 hp we must notify the press
always nice to find out your car thats stock, has more power than advertised
The heavy breaths through his teeth in the middle of sentences get on my fucking nerves. So triggered right now....
The famous yellow marked hose with the boost restrictor in it. Majority of the gtr's have them removed now but when they came out it would keep the horsepower down alot, once removed you feel a big difference. Even the R34-gtr in the intake on the side of the airbox there is like a large plug, once you remove that you get an extra air intake for the stock airbox plus better intake sounds haha.
I love how nobody's commenting on the fact that these cars actually DO make 276HP from the factory. Nissan installed a boost restrictor that limited the car to 0.7 bar of boost, about 10 PSI. Nissan highly encouraged their owners to remove this restrictor to unlock the full 1.0 bar/14.7 PSI that the motor was designed for, bumping power to about 320HP.
it only takes about 5 seconds to remove the restrictor. it's stuck in a boost line and you just cut it off to unlock all that power. Matt Farah covered this in his review.
This car was well ahead of it’s time
Lol so you're Doug! Been reading your articles for quite a long time now. Great work!
Super impressive! What a gem. Can't believe how old and yet still kick ass these cars are. God damn the Japanese knew how to make bullet proof cars back in the 80's-early 2000's. These days? I don't know anymore.
R34 wheels? They look good on the 32.
I'm not surprised as I've read for years the R32 and R33s made 320 crank hp and the R34 made 340 but it is great to go beyond print and see real world dyno figures :)thnx for the vid
Hey Doug,
does the dyno results show the boost pressure that the car was reaching during the runs? one of the ways these cars were capped from factory is from a restrictive exhaust system. This leads to a back pressure which can limit the boost slightly and an aftermarket exhaust in the case of the GTR can actually add 30-40Hp from simply bolting it on and freeing up the exhaust to build slightly more boost.
Regards
A fellow awesome R32 GTR driver.
What makes it more interesting is the age of the car. Factor in your mileage (and that its 25 years old), plus (a more realistic) +20% drive train loss.
Thats why these cars are so sought after.
Did you check for the stock boost restrictor (marked in yellow on tube in drivers front of engine bay) ? Removing that banjo restrictor should bring you up to 1 bar of boost so if its not currently there that would explain the increased amounts of power. They used that restrictor to fall in line with gentlemans agreement.
Stock boost levels? I hope mine has similar results!
I'm a Japanese.
32R was approximately 330HP at the time of a new car.
the catalogue specifications were blague!
Close to 310 is the real figure for R32, 320 for R33, 330+ for R34, 330 for Supra, 320 for 3000GT. Evos and STIs were over 280PS from 1997 and forward.
the stock exhaust may have been designed to restrict it. possibly to comply with emissions. Ford restricted the intake tube on their turbo escort in a similar way. So people would upgrade the intake and gain 30hp or so
Very nice numbers... Now imagine the possibilities...
It's crazy how far we've come. Today, a stock v6 can put out well over 350hp. I love the old GT-Rs though!
Has the factory boost restrictor been removed? Nissan put a little plastic restrictor in the line marked with a bright yellow ring right before the boost solenoid, taking this out gives an instant 40 hp increase courteousy Nissan. This is why most r32s are about 320 in stock form.
Between the exhaust, the front mount intercooler and whatever other little things could have been tweaked over the years it's definitely possible to have picked up 50hp. The RB26 is a beast locked in a cage anything that removes restriction unleashes horsepower. And Nissan added plenty of those in the first few years.
The 1996 Nissan 300zxtt (last year imported to US) was detuned from 1990-1995 horsepower
level of 300 to 280hp. Why was it reduced?
15% is actually a pretty low driveline loss for AWD. 15-20% is a good measuring stick. I generally use 18% when using Mustang 1100-SE Dyno (which is similar to what is used at AWE). Which actually means at the crank you're putting about 340hp down... With that said, 320-340hp sounds about right.
Some dynos, like DynoDynamics can take that full 20%. I've done a dyno 'year' where I tried a few dynos in the same car. I found that Dyno Dynamics can be a driveline loss of 18-20, DynoJets can be 12-15 and Mustangs can be 15-18 for an AWD car.
Can't go wrong with 15% though if you want to keep your numbers sounding less inflated. I always tell people that if you're going to quote 'crank horsepower' based on your wheel horsepower, do a range. 15-18% "Yeah, it made 281whp on a Mustang dyno, so that's anywhere between 320 and 340hp at the crank." sounds a lot better than "yeah dude, it makes 350 crank hp!"
+chapel976 on a side note - it also depends on the dyno shop. I brought my BONE STOCK 97 328i (192bhp) to a dyno once... they ran it a few times and each time it made 190whp or more... I'm pretty sure their dyno was broken or they didn't know how to use it.
True the exhaust doesn't add 50 hp but I'd say it adds around 25hp the put a restrictive exhaust from the factory so a custom one does a lot more than usual
you defo have an uprated intercooler at the front they are tiny stock and not shiny
always painted black too
the dyno is seem to be right here
but i think he needs to check the ECU settings for any changes. Just to be sure he should have reflash the ECU back to factory settings. also there is a boost controller limiter under the glove compartment. Removing it will allow the boos limit to be raised.
later models of the Skylines could gain around 400BHP just from doing basic stage 1 tuning
As mentioned, Toyota, Nissan, and Mazda all maintained a 276 hp limit from the factory with the Japanese government. The cars were however capable of much more, as demonstrated by this video, and the lower power was made by way of a restriction in the vacuum tubing to the wastegate actuator. Toyota and Nissan both clearly marked this restriction in the line with yellow tape so the owner could remove the restriction and enjoy a boost of 50+ hp right off the lot. There was never any rules that stated the owner couldn't make more than 276, just a gentleman's agreement from the manufactures that they wouldn't. As for people wondering if their N/A Sentra is understated, don't get your hopes up, this was only for the big performance cars like the Supra, Skyline, RX-7, etc.
what about warranty voids for modifications?
@Doug DeMuro Ford did the same thing with the 03-04 SVT cobra's. The car was rated at 390 at the crank and makes 360-370 at the rear tire.
Be interesting to see what boost this is running, compared with stock? I wouldn't be surprised if the ECU was modified too. Something you couldn't tell to look at.
Looks like a good example there though!
QUESTION: What are the torque figures? The RB26 is a pretty torquey engine isn't it?
This guy needs more subscribers his videos are always but awesome haha I can't stop watching!!!!!
I am sure people have mentioned it like a thousand times... but, what brand dyno was that? There is low reading, high reading, and in between/correct. The difference between a low reading and a high reading can be as much as 30%. Yes! 30%! So, you might see 300hp on one and 200hp on another... from what the video shows, I would say it is a Dynojet, which is the correct reading dyno. The dynapack, which people like to say is correct, is not reading power at the wheels, it's reading it after you remove the wheels and bolt on the dyno.. which means it will give higher readings, as much as 30% over the lowest reading. The lowest reading is the Mustang Dyno. The in the between, would be the correct reading, which is what SAE uses when a car is produced and presented to them for testing to give a rating and/or limits to what can be stated. That would be a Dynojet, which is what i think you used from looking on the video. There is sooo many brands out there, and there is chinese brands also, which are really poor quality machines, with readings all over the place from one to another and even on back to back runs.
I actually read that the real rating was 350HP but was really illegal so they made it to 276HP but everyone knew about it that's why this guys is still the BEAST during it's prime.
I'm honestly impressed and the civic part at the end was funny
I have not been reading through all comments, myabe it is already mentioned? However, what boost is the car running right ow, stock is around 0.7-0.8 bar right? Is the restrictor removed, wich increase the boost to about 1-1.1 bar? This restrictor was "meant" to give around 320 hp if im not mistaken. Even the hose is marked with a yellow stripe so it was easy to find the restrictor.
you have an exhaust. The OEM exhaust is hugely restrictive in itself. Good chance the boost restrictor is out too.
Oh lets not forget that there's a known difference between American dynos and whatever else too. Not sure how much difference it accounts for but it does exist. Will have to look into it.
so I'm going to add my two cents based on things I know, for one changing the muffler with one that flows better can actually increase boost at higher rpms where horsepower peeks especially older cars, and another thing is that this car has atteza-ets when you get going on the road and you don't have rear wheel slip all power goes to the rear wheels increasing its efficiency by reducing drive train loss until it it slips then then splits up to 50% power to the front wheels, you can just pull a fuse to disable this system and use a 2 wheel dyno and get a more accurate reading, and 15% power loss through the drive train is purely a rule of thumb.
Doug, can you post pics of the dyno sheets? Curious to see the power curve. Makes me feel really good about my car.
Another quirks in Japanese agreement is all of the speedometer will max at 180km/h and for the K-cars 660cc,6+hp and 140km/h.
Think about it, gentlemens law from classic Japanese times. It limited anything over 300mph so makers started to claim below those numbers to get away with it and give us high powered, fun cars. Hope that helps in a logical way!
the thing is, that all the Japanese horsepower rates are underrated due to the government agreement which was taken down on '99 I think, which limited the max. horsepower to 280. All the cars had theoretically 280, but practically little bit more. Same goes for JDM Supra TT for instance.
is it hard going from a left hand drive car to a right hand car? clutch pedal and everything reversed?
More surprising is that the skyline has maintained its power after 25 yrs all hail the king of JDM
also to give more info on a Mustang dyno 280+whp is more then a regular dyno jet which is what most people use and this on a dyno jet would dyno 300+whp. Also if it's a awd skyline it's more then 15% loss. It's closers to 20% due to having more drivetrain.
do you got an ecu remap ? you must watch out because japanese only got 100 octane fuel and the stock ecu did not have a proper knock control.
Sounds very accurate for a bone stock r32 gtr with exhaust. You may have got a higher figure using rear wheel drive only. GTR, Supra Rz, Mitsubishi GTO(3000gt),Soarer etc all have around 320 at the flywheel. The Gentleman's agreement explains why US 3000gt was rated at 320hp but exact same engine in Japan was rated at 276hp
It says "Tuned by HKS" on the lip spoiler, under the main spoiler.
is your boost restrictor still in ? the BNR32 came with one (mine was when i got my gtr, so its been on stock boost all its life.) Usually they've been removed from previous owners. Its rare for a BNR32 to have them in now days. Nissan actually labeled where the restrictor is so people could remove it and have a bump in HP. If yours isn't in, it's not running stock boost level.
Well it's nice they measured three times the same power on the wheels... but shouldn't the power decrease the more times you measure because the car gets hotter? The first run should be the best when the car is moderately warmed up before, right?
The reason for the increase is probably due to the build up of carbon deposits in the cylinders therefore creating a higher compression during combustion. It's not that uncommon to have more hp over time because of the build up if the car is taken care of.
Is the difference of horsepower a problem if you want to insure it?