Audi TT 1.8T - N249 Delete - Should you do it? Should you re-fit yours? The answer may surprise you!
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- Опубліковано 8 чер 2022
- So, the N249 Delete. It's a VERY popular modification, but is it wise to delete a part that Audi spent time and money developing?
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Mines all stock form .. bryn replaced all my pcv pipes 😎
Outstanding content, explained clearly, no confusion and I was able to understand exactly how this works on first viewing. What I take away from this is there is no good reason to delete this, if it's broke it should be repaired, if you don't like the look of it and want a "nude" valve cover then it should be relocated which I am guessing should not be too difficult and involves a couple of custom pipes, but definitely no performance to be gained by ripping out a healthy N249.
This format is awesome. Definitely enjoying the premiers. The informative commentary from a know voice of experience makes these choices so much more clear
Awesome explanation keep coming these Tech Time talks!!
Thanks for explaining this !
Awesome. Very nice explanation. I didn't know about it being a failsafe in case of N75 failure. Now I am even more glad that I rebuilt whole N249 from scratch myself last year :)
The only two valves I was sure that were broken in my case were the DV and the pancake one. As those two weren't touched by any mechanic in the past 20 years according to production dates, I assumed that the "not as easily accessible" ones are probably in terrible state too, so I replaced everything.
Car now behaves much better.
Can I ask how you rebuilt it did you use aftermarket hose or oem?
@@leegoodwin47 I used brand new valves and connected them with reinforced, silicone vacuum hoses. I bought 3 metres of 4mm hose and 1 meter of 8mm one to make sure I have enough.
The hardest part to get (at least for me) were hose tees matching the sizes and shapes of the original ones (there were like 8mm-4mm-8mm or 4-8-4 connections or something like that and at least one reduction from 8mm to 4mm hose).
I reused the metal plate that was holding all of those looping valves in front of the engine. Something has to hold all of that and there was nothing wrong with it (it's just a metal plate).
The vaccum reservoir was also in good shape. It wasn't leaking and it's easy to check, so I didn't bother looking for new or aftermarket replacements.
Finally. I posted this comment 3 times already and every time it was disappearing. I wish YT at least showed an error or some explanation on why my comments are gone.
I’m watching this again! 😂
The gift that keeps on giving.
Merry Christmas 🎅🏻
Well informative Bryn... explained like a pro👍👍
Very clear explanation 👌
Great explanation. I've no clue when it comes to anything technical but I understood all of this, keep these videos coming 👍🏻
More of this kind of thing please. Excellent explanation. Thanks.
Awesome video i cant wait for the next tech time
Excellent demonstration iam definitely keeping mine on.
Yet another top class video 👏👏 ..I just wished you knocked this out a few years ago when I decided to rip mine out!
This is an amazing explanation of this system. I cannot express how useful this is. Saved it for later during my journey on my second a4 b5 lol
great explanation mate I think I will keep mine on as its all working perfect 👍
Good stuff. I never completely understood that system til now
Thanks Bryn, well said.
Amazing knowledge great no nonsense videos great advice thank you
Thanks Bryn, this is the most interesting video about how works N249 valve. Your explanatons are really good! I low this new Tech Time section, we learn about out TTs a lot , thanks again and I wish you have bigg success with thise videos. Congrats and regard from the Basque country! 💪💪💪
Great informative video mate maybe show us options where to relocate it as I'd like to keep it but think it's such an eye sore 👍🏼😎
Leaving as is I think.. cheers for explaining Bryn 🙂👍
Can’t wait!!
Excellent video Bryn. One of your best I reckon. You should do more like this. Keep up the good work👍
Thanks!
Top Drawer info Bryn....think mine is staying
Finally! Thanks for this. Now I know why it's there. It at least, was there. Deleted mine when I inadvertently broke the vacuum storage connectors doing a rocker cover gasket. Might buy a new vacuum resivoir and refit but in a more discreet location. Thanks for this vid!
Great explanation thankyou
Great video man
Thanks for the knowledge
Great explaination thanks for knowledge
Now that was an informative video, and thankyou so much for explaining it so indepth but without confusion. Don't suppose you could do another but for the sai pump could you? lol
Very detailed video. I have a problem with my AUM, when I drove on the highway in 5th and in boost it felt like the turbo went on and off. Boost then no boost then full boost. Wanted to do the modification but after seeing this I will replace the N75 and check the N249 system and might replace it if the problem keeps on.
Thanks for the video helped alot
Don't know if its board worthy, but would love to see you do a vid on installing the DR...from splitting the unit, installing the LED strip, to wiring it all up
I Do wonder how many engines have been nuked because of the N249 delete? Great stuff! Sometimes hard to get your head around if you are new to it, especially with all the noise online and people obsessed with ascetics, but I suppose just a bit of logical thinking does the trick!
Hey man, glad you have your license back! Wondering if you have run into any rev hanging issues on the bam engine. Done this delete and catch can but have bad rev hang after boost in my s3.. vac leak do you thing?
Great video finally someone giving educational information about the N249 valve, whenever I see people asking for help about deletes on 1.8Ts I always tell them to leave the N249 in as it has alot of benefits, when I removed mine for science I was getting a very slight turbo surge, it was gone after I reinstalled it.
More than 10 years without n249 and car works as first days....
Good video, and yes Audi didn't design it without a reason. My experience is that the car drives way smoother with the n249 than without.
Beautifully explained🇦🇺🤜🏼🤛🏼😎🍀🍀🍀
When I bought my tt most standard parts that could be deleted had been ie secondary air/ combi. But I am old fashioned so all back to stock. Cars run great. Replace all rubber bits.😁
Very good video and realistically why would anyone really want to contradict audi/vw who have been developing turbo systems for long enough and remove in essence a safety system. Things have come a long way since the laggy 1980s when engines and turbos regularly let go.
excellent
When you are driving a stock engine there is virtually nothing you need to delete unless you are bored. However when you get a tune every tune I looked at the 249 delete is mandatory. When or if the N75 fails your car will simply fail to make boost higher than the wastegate, if you are really skeptic go outside unplug the N75 and take a spin you’ll barely hit 5psi which is the psi for your wastegate. I know plenty of people including myself who run a unplugged N75 during the slippery winter months with zero issue. Excellent video explaining what the 249 does and why if your tune does not require it to be bypassed you should or could just leave it alone.
Great vid!
My original N75 was very slow to respond and was causing boost spikes (21psi+ on a stock car).
I believe the N249 pulled the DV open and possibly saved the engine from catastrophic failure before I figured out the issue.
I was considering removing it when I bought the car, but after the above experience when I fit my catch can I am going to check and replace any spurious vac lines.
Sounds like your n249 did indeed save the engine!
Do all of the 1.8T engines have this valve ? or just 225hp versions ? Btw nice video
Next time you've got your teaching head on, maybe extend that video with a part 2 about DV and aftermarket diverter/blow off valves especially springs etc 👍
Not a bad shout, ill add it to the list 👍
@@BWSTT I remember asking you about the n249 waiting for the rain to stop before you did my clutch so for me this was great!
Remember I had a twirrupping noise that you said might be boost leak? I smoke tested but couldn't find anything, replaced the DV with aftermarket. Tried the three springs and the lightest one (red I think) reduced the twirrup noise massively (although still does it a little)
I'm tempted to book a few hours with you and come up to see if you can give it a look over and see any issues that need sorting 👍
From what I’ve heard it’s a bad thing to do, so this should be interesting
Hey hows it going? I have a mk4 1.8t golf and should i delete the sai and evap? There's lots of internet chatter that the sai/evap/n249 should be the first mods to do but i think rebuilding the n249 seems a better outcome BUT what about the rest?
Bryn, any chance you could do a Vid on how to change the Bonnet cable?
I am struggling like hell lol?
😂🤣😂
My 1.8t pulls oil when I get up to speed good driving for a bit cool but hen i go to slow down its fine as it idles down but ones I get back up the 2000 oil light comes on at 3000 goes away mainly in town with all the bs stops it runs at low rpm always causing to pull oil or light turns on also having an issue with blow by and yucky milky oil in crank case breather hose
Good
I know there is probably not much chance of you seeing this Bryn, but I'm currently looking into some boost issues that i have... if my turbo actuator was broken, ie diaphragm blown etc, i guess the the first time time the engine detects an overboost, it will the use the N249 to open the diverter valve and bleed as much boost away as possible... This is what i seem to have at the moment, boost can reach 20 psi plus initially, but then it drops to somewhere between 5 and 10 and you can hear the boost being dumped out... Initially i was told it may be a dodgy map detecting an overboost after fitting a badger 5 tip, but the more i research the more i think it may actually be the actuator
It could well be the actuator, I would test it manually with a pump and see what pressure it moves at
Iv deleted mine as I'm doing a conversion int to a corrado and it's not ever gunna get daylied or tracked and it looks so much cleaner
A little late, but is there a way to bypass the n75 or “delete it”? I’ve seen people using manual boost controllers. Is that a solid replacement?
Hey Dude
I drive the AUQ. What i have seen makes me feel that something is wrong with your explaination. There is the boost circulation valve, wich i have changed due to higher pressure. Then there is the N 249 Valve under the circulation valve in the suction hose. But it is the circulation Valve that prevents from building up pressure on closed manifold. And this circulation Valve is one-way functional.
What i have recognized is a sucking or screaming noise in regulated boost mode ( half gas or whatever) wich may come from the N 249...but i am not familiar with the exact function. May be that it mixes particial air into the system to lower the boost additional to the wastegate....!?
Kind Regards
Klaus
Great explanation, may not get a reply but maybe a viewer can answer. Does removing this give you an engine warning light
It will throw a code for n249 missing, you can bypass it, or you can put a resistor on
@@BWSTT thanks for the reply man, it does make the head look messy and a clean up would be nice have a new fuel rail and coil packs to go on will do it then thanks
Great information. I’m relatively new to the world of TT. I bought. 2001 180bhp 6spd Quattro a few months back and the list of parts is well, everything so far. Last weekend I deleted the N249 etc. also removed the secondary air pump as it was sized solid with water. Anyway I still have an annoying problem. From about 2800 rpm if I go wide open throttle in second or third when the car is hot I get a little power then it backs off…. Like low fuel pressure or something. It now has a new Bosch MAF. All PCV hoses replaced with new ones. New diverter valve, new turbo control valve, new fuel reg, new fuel filter etc. etc. when it’s not doing this the engine has loads of power and drives beautifully. Baffled at this point. Thoughts anyone??
Combi gone too 😜
@@mickehoe Have you found out your issue?
Does this also pertain to the gen3 1.8?
Well now I know why I hear a whooshing sound under WOT, sounding like the DV was leaking massively... I now know my 1.8t has an n249 delete
N i c e
Hi Bryn. I have a lot of brand new Audi TT performance parts that I'm looking to offload. They were for a build I haven't been able to complete. Would you be interested in them?
So good explained thank you.i have a fault now at my seat leon 1.8t 180hp and maybe you can help me 17695 Boost Presure controle valve n249 / P1287 -35-00 Open Circuit. Ehat can be please help me.thank you!
The n249 valve on my car was deleted when i bought it and didn't think annything of it. But about a year ago i blew up my engine, a connectingrod snapped. I bought a new engine and the guy from wich i bought it told that the blowup could have something to do with the n249 delete and that i should keep it installed on the new engine. Now that i have completed the installation of the new engine i am looking for what could have caused the blowup. Was the n249 delete the issue??
Нет.
does the map sensor have a role in that situation? if it detects overboost doesnt cut fuel?
Its the map sensor that detects the over boost. Regardless if it did cut fuel, you do not want more air than is wanted forcing its way in
my turbo had only 1 screws so i put 3 new screws when i run it for a test broken my exhaust octopus..i pay on garage to fix it and now i got oil leak in turbo it leak only at high revs in idle no leak....i test oil cap and for sure i got exclusive crankcase pressure my pvc system need repair its broken..i wondering change it or delete it?this video make me wondering if my exaust broke because of this?i got this thing 3 months and happen to me all ur vinteo..i change trasmision sensor etc now my gona change turbo because this mechannic open it to remove it or pcv need repair..all vacum line wire seems like a rat eat them and have only 80k km before 30k km become forged cost me more than mk2 and every day something need repair....u thing my exaust broke because exclusive crankcase presure?
To where would one relocate the N249? Mine works fine but the engine bay looks so much cleaner without it. Can’t fine any UA-cam content on that.
What would happen if you bipassed the n75 with a manual boost controller to gain a pound or two of boost? Would the n 249 still protect from over boosting? Or would it keep the diverter open past the stock psi? Mine only pushes about 9.5-10 psi
I wouldnt advise bypassing the n75 to use an mbc, if you want more boost get it mapped in properly
@@BWSTT thank you
Think it may best to put all mine back in bud 😉😬
Haha nah, you never drive it in anger, youll be dafe
Surly there's something else you can do to act as a fale safe that is not using the ECU and bits of tube that cause loads of problems when they rot out?
Well since the ecu controls the boost using those hoses, theres not much you can do, aside from the car shutting off completely. You could put in an mbc, but still, if the hose fails, an increase in load and rpm increases turbo spool, the only way to stop that is with a boost reference to the wastegate, or to dump the boost created, or to not allow any throttle movement.
@@BWSTT how about a blow off valve,it would do the same job but sorts of doing the same job as the one you have just removed.
Seems like leave it alone.
I have a question why does my Audi TT never get hot enough for the heater to work it always stays cold I mean I’d rather have it cold than hot but a heater would be nice
Bad thermostat
What happens when it starts to go? I want to keep it, but I’m having some symptoms that act kinda like a slipping clutch, and one reference says that a N249 symptom is like a clutch beginning to slip. N249 is cheaper and easier than new clutch…
I can’t see how clutch slip over rev could ever be the same as anything n249 related going wrong
Ok. This guy says his N249 is causing his RPM spikes, not clutch slip.
m.ua-cam.com/video/WtK1XoxW_1Y/v-deo.html&pp=ygUMTjI0OSBmYWlsdXJl
I don’t know what a bad M249 would cause otherwise. Here is another symptom that makes me not 100% certain I have a slipping clutch. If I set cruise control, and slow down, then resume cruise control it will start to accelerate but then dump all boost through diverter valve more dramatically that I can do my self. It’s very loud. I can also set cruise control then disengage by pressing the clutch, mimicking a slipping clutch, the boost isn’t dumbed nearly as dramatically.🤷♂️ I’m going to replace M249 valve and replace vacuum lines and I’ll let you know. Please let me know if I’m crazy and it’s something completely different
@@Thomas-rx9ur if the revs rise without you gaining any momentum, you’ve got clutch slip, it’s impossible for it to not be. The only way an n249 is involved, is if as I said in the video the boost control is at fault causing boost spikes, causing more power than the clutch can handle, causing slip- so a bad n249 that also can’t then prevent the boost spikes would “rectify” that but only like putting a plaster on the situation- the clutch is still at the end of its life, and you’ve still got overboost that needs properly addressing. The much more likely situation though, is that youve just got clutch slip.
As always, thanks for the help.
на автоматической коробке передач чувствуется разница после удаления этого клапана динамика становится на много слабее
👍👍👍👍👍👍👍👍👌👌👌👌💪💪
All those silly pipes and valves in an extra system takes too much time for it to control it in reality, a more instant response has given mine a much better drive under performance and no difference under steady drive, looks so much better and I do have a boost gauge.. but ultimately the WASTEGATE bleeds off the boost pressure all the time with instant information using the N75 valve. The n249 does not stop overboost. The n75 stops overboost. Unless faulty or sticky wastegate.
I tried to make it clear- if the boost reference to the n75 fails, the n75 cannot control the wastegate in any way, at all. At that point the n249 will open the dv to stop overboost.
Also, you say they take too much time to work- then n249 valve is controlled before the throttle plate is closed, and the valve is allowing a closer source of vacuum to control the valve, so is measurably quicker to control the valve if the system is working, since theres no delay whilst waiting for throttle to close, and vacuum to be generated in the intake.
@@BWSTT in regard to the time of it, I mean a more instant response to the actual pressure inside the inlet manifold, the DV will sense the exact pressure inside there giving a more accurate and instant feel to the DV, which under harder driving helps with boost on and off, as you've agreed some differences are marginal, and I like marginal differences because when you add them all together it becomes a huge difference :)
I do agree though Bryn with regards to it being a fail safe, the way you explained the overboost(on an unhealthy turbo) would potentially be the only real advantage of it.. but again thats on a system that isn't maintained or looked after.
With a healthy n75 and all turbo workings, overboost will be instantly (or close to) controlled by the wastegate dictating how much boost to generate, as you put it very clearly.
I don't see many n249's on many big power builds still suing n75 etc or without.. and I know of a good youtuber that's posted how to do n249 deletes also ;)
As a general driver experience you will have more feels without an n249 as it's a computer operated system controlling the diverter valve.
But there could be slight increase in MPG keeping the n249 potentially. It's not a design Audi implicated to help performance that's for sure. And most TT owners would prefer performance I believe over keeping as much economy but that's likely quite split with how the fuel prices are right now.
Not taking anything away from the video mate was spot on 👌 keep up the good work. But I'll certainly not be putting my m249 back on,. I prefer the instant boost repsonse and raw feel(minor) over how it used to be with a working n249.
I think the more important topic to be at hand is the fact that on a 1.8t, deleting the Pcv valve and removing positive crankcase pressure / ventilation will result in far worse symptoms and failures than deleting the n249 👍
You should do a video for people to see how and why they should be relocating their PCV Valve for A healthy internal system that doesn't build up acid and so on and so forth 👌
Of course I understand if the n75 wastegate fails, the car can overboost and n249 isn't there to help out.. that's as I say the only benefit I see.. but if you are driving your car like myself and always watch boost pressure, temps and 02 live data then things aren't a worry. But I understand for the other guys who don't get too into that stuff, some might want the fail safe as they have no clue about the running of an engine, and that's fine of course Motorsport isn't everyone's cup of tea 😊🏎️
why not just replace the N249????
I think it would be best not to delete it
Fancy featuring in a video titled “ mk1 tt specialist takes his first drive in a mk2 ttrs?” Lol
@@BWSTT if i had a TTRS i would definitely be up for that i only have a stage 2 225 bam lol. Maybe 1 day i get my dream car
@@BWSTT One of my work colleagues had a stage 1 TTRS, by god it was fast!
Still have my MK1 that we did the steering rack on by the way!
This is why BMW's have 2 boost solenoids, one's a spare to avoid over boost.
i deleted because its just another thing to cause a boost issue on a 1,8t
Removed, weight reduction 😂
bad for daily driver imho :)
This gives a good example for dummies not to touch their cars. Instead of fixing something that doesn't work they just bypass it which makes no damn sense... You want more boost, then get some upgrades !
The Vaccum system on this engine is PURE shit! So delete all that and ye dont have any issues and pain in the ass search and destroy time to find faulty parts and hoses.. Ive had two TT's APX engine.
Great explanation love this new Tech Time!