I want to make it ***VERY CLEAR*** that any time I say "pound of air" in this video, I'm referring to the mass flow rate of "X" pounds of air per minute. NOT "X" psi of boost. Also, I messed up a bit on the time stamps, here are accurate links: 1:50 How to Read a Compressor Map 16:18 How to Install a Turbo Speed Gauge 20:26 How to Hook Sensors up to Megasquirt 22:45 Test Pulls 24:03 Analyzing Surge 29:50 Making More Boost 31:36 Analyzing Choke 34:21 Trying to Overspin The Turbo (Myth?)
I liked the comment about 18psi I am spending way too much time on that site and on your channel. I want to do something very similar to your car for track use. Keep up the great work.
The data you provide is underrated man. For the amount of effort you’ve put in it’s sad you don’t have as much recognition as the you tubers with all the flashy cars.
@@jefftoonstra5087 Not realy. If that boat with that much Power and so much traction barely beats the Miata on 0-60 (3.5 Seconds) 60-120 will be roughly 8 seconds due power to weight. 0-120 the miata easly wins.
Greg, this is without doubt THE BEST turbo compressor map video. A perfect real-world explanation (with actual data - no bluffing or fudging figures). It was even better than Brett's video, from GFB, on the MCM channel. Simply brilliant. Thank you. (Huh.....how can anyone give this video a thumbs down? Shame on you!)
This is an incredible service. Sitting with a turbo’d NA that I built along side your videos, you’ve got the motherload of content that I bet other cars platforms wish they had.
Now I finally understand compressor maps, every time I went into a forum trying to grasp the concept I was welcomed with comments with more mathematical and technical jargon than a Apollo mission to the moon. Now I need to understand the exhaust side of the turbo 😂
13min of technical content.....and I promise you..we are gonna install..the flux-capacitor on a miata..and see...... Killer! :) This was insane, good explaining skills and the passion
Came back to watch again after a few months. Great job simplifying the fancy engineering stuff. My brain has a hard time comprehending engineering technical documents. You made it easy. Thanks man!
I loved this video. We have a running joke at my job "pumps don't make pressure" because people don't understand flow vs pressure. Thank you for an awesome video!
Vids like this make me excited to put my car back together. Its like a rolling science experiment! I want to put sensors on everything! This info would have been cool to see back when you swapped compressor wheels on the old build. Time to start shopping for an EFR 6258 😂
Thanks Greg! Also, pretty sure you can wire the frequency output of the BW sensor up to pt4 on a MS3x, it has an option to use hardware timers on the main processor, so it should manage to read 160K from a 6258 no problem. 0-5V only. Little to no documentation on it though, about to try it myself. Or, you can also wire it to MAF input on maybe any MS3 and config it as a frequency MAF and do some math on the datalogs after the fact. No need to actually run MAF, you can just log it's frequency.
I wired up the EFR speed sensor direct to PT4, configured for high speed input 1.75 teeth/rev on my MS3x. Seems to work fine. It quits reading around 2K RPM and I haven't maxed it out at 140K+ RPM yet either, around 1/10s update rate could be better but still plenty workable. I log a MAF while running SD and it's still working fine too. Going to make a frequency generator and send a fixed signal just to make sure I'm getting correct data and see where it caps out.
Great video man. Covered a lot of ground here in an easy to digest way. Really demonstrated how beastly the EFR is too. Love the Southern Hooning shirt. That's a throwback. As for the over spin, I think it's that whole shop vac concept. It actually spins faster when there is a restriction. I forget the exact physics law, something something stall. You get dangerous overspeed when the car is under heavy load and a boost pipe suddenly blows though, I believe.
This is a fantastic video. I don't think it's "overly technical" at all. You do a really good job of explaining concepts and then exhibiting data to show what you mean without getting lost in the weeds. Your videos are more useful than my engineering degree when it comes to a lot of this stuff. Super interested in an rpm-variable boost video.
Currently searching turbo sizes to replace a 2554r on a 1.6, Cram all the knowledge in my skull miata dad Love this video hopefully more technical videos to come
Been watching for years and can't believe you still only have 105k subs and I've been trying to find a patreon or something to support you (other than the shop). Insane information, both in video and on your website. I didn't have a Miata for 2-3 years for personal reasons and I don't think I would've bought one again just now without your channel. 5/7 would pump money into Craig/Kreg/Grag/or any other variation if you had a patreon
Did I miss a video where you changed shifters? Love the content here Greg, you present so much technical info in such an easy to digest way. Keep it up!
I watched this a few months back and had a hard time w all the terms. I have been reading maximum boost by corky bell and now this video is way more fun to watch.
Hands down the best explaining and favorite car stuff channel i am watcing your videos since the "garden hose" times and man does you upload quality stuff keep it up Greg i wish some day i meet you.
yes i absolutely loved the shared knowledge, although its not something i want to watch while im laying in bed trying to sleep. because now my mind is racing with the possibilities! man i cant want for my turbo so i can also " keep on boosting"
Loved, loved, loved this video. The way you break concepts down into edible chunks and deliver fantastic entertainment is why you're the best dad on youtube 😁
Nice one brother. Interesting topics, I don't know much about it haha. I do have a mate who overspun his Borg and it blew up haha. He went up a couple of sizes and now runs a speed sensor for safety. He was simply making more power than the turbo was rated to
Peak nerdiness. Good shit. Thanks for this Crai....Greg! I definitely enjoy these technical videos! Even though I'm supercharging my car for low-end oomph rather than high end zoom-zoom (even sporting that Broke&Boosted sticker) this is hella interesting and useful!
overspinning topic: If you don't use compressor like you did, there is less airflow compared to when the engine is charged so overspinning can't happen. It could happen in case you completely removed compressor rotor - there won't be any appiance which would use power generated by the turbine. But this is not the case. You are still spinning compressor wheel which is powered by the turbine and you are compressing air and blowing it back to the atmosphere. And yeah setup you tested for overspin did propably about 120-130hp because of that added extra „restriction in exhaust“ ;)
Compound is large turbo feeding small turbo on compressor side. With regards to overspeed, factory cars are usually smaller turbos and made of cast aluminin meaning they can reach max rpm easier in NA and the cast aluminium has a lower tensile strength. Your wheel is billet an has a higher tensile strength, though aluminium still suffers from fatigue. Running a wheel at its limit may not shatter straight away, but eventually it will, everytime you hit redline line you have put tremendous force on the wheel. If you calculate the centrifugal force of only 5grams of aluminium at a radius of 31mm at 180,000rpm that little piece of 5gram aluminium is experiencing 5500KG of force try to pull it outwards. You should displace the compressor wheel in water and calculate its volume and mass of each fin, as well as the back and entire wheel to calculate how much force it is going through. Thats 5500kg for 5 grams. That is why they make the housings so thick in case a wheel breaks.
Fantastic video. I’ve over spun a Turbo already running near its limit that then had a slight charge pipe boost leak. It’s to do with the engine load like you saw with the street vs dyno logging. Something else for you to test/prove!
In terms of using the dyno readout and boost log for the Compressor map, you mention a calculation to figure out Flywheel bhp. Maybe one way to make the compressor map more accurate would be to use a Dyno that measures transmission losses, as yours must be extremely unique! 😁 Awesome video as usual though bro ✌
You have to simulat the overspeen the turbo with a small leak! Because you need the strength off the engine to speen the turbo, but the leak for the turbo to spool up and over spean
Awesome video! Been researching turbos and compressor maps, and I was a bit confused about the hp to flow thing and your videos really explained all of it so well. I think I'll also buy a speed sensor for science :-)
@TheCarPassionChannel I suspect that with the turbo disconnected (Running NA) not nearly as much air flow is passing in, and therefore Out of the head and into the turbine side of the turbo. So, there just isn't enough air to spin it up to 168k rpm. Super big thanks for all the research you have done, and more importantly, summarizing it so that we who are not quite as bright, can understand. I have looked at turbo pressure maps before, but had no idea what they meant. Now, to get more than 210hp from my garrett SR20DET...
People/bros need to play with turbos in the Automation game. They are guaranteed to learn a thing or two how turbos work and flow, matching exhaust housings etc!
The 10lbs/minute equation is correct. Compressor maps are rated for 93 octane us (98 everywhere else). For a very close approximation of what that same turbo can make on e85 you add 30ish percent to the final bhp number ie: If the turbo can produce 40lbs/min equaling 400bhp + 30% = 520bhp on same boost pressure on e85.
26:35 If you're losing more PSI through the intercooler, that is a good thing because that means you're losing heat Manifold air density is the name of the game. Pounds of boost means nothing. Normally to double the horsepower you need at least 14.7 psi additional air at ambient temperature However, the guy that invented nitrous oxide systems, has invented cold air supercharging, where they just compress normal air, but into a tank, then when you're ready to use it, for a quarter mile run, you just run off this pressurized tank. The air is coming in at 10 lb of boost which technically shouldn't double your horsepower except it's coming in at - 100° f. And therefore, because it's more dense, it doubles the horsepower at 10 lb instead of at nearly 15, not to mention almost no chance of detonation with temperatures that cold
Yes pounds of boost does not equal power as mentioned at 3:57. However PSI is how you measure intercooler pressure drop. Significant pressure drop across the intercooler means it's too restrictive. 1-1.5psi is the maximum you want otherwise you're not using the right intercooler for your application. High pressure drop is not desirable. PSI can also be used to measure compressor pressure ratio to help plot your setup on the map to determine efficiency
It's a centrifugal compressor. You'd be more likely to overspeed it by completely blocking either the inlet or outlet. Then it can't perform work, so it'll speed up. Just like a vacuum cleaner speeds up when you plug the hose.
Nice technical video and stupid yet very informative tests, I wish there was more like these. I just wanna give you some additional food for thought. In your plotting you assumed the pressure ratio by having 14.5PSI of absolute pressure ie 0 restriction air filter and induction pipe. I can't tell for the induction pipe because I haven't done that yet but what I can tell is that even aftermarket air filter does restrict airflow. Not that much in my case, usually 0.2 to 0.5 psi but still, it moves the pressure ratio. Especially with restrictive/dirty air filter, once the pressure drop in front of the turbo PR moves up fast. It might be also interesting to hook up a third MAP sensor (yet another analog in needed) in front of the turbo to really calculate the PR seen by the compressor. Some industrial engine have sensor at the back of the airbox to indicate air filter blockage from dust, that read up to 1.5 PSI of vaccum to get a more precise measurement rather than having a 1b MAP sensor used at most on a tenth of its full scale.
Awesome vid dude... really well done. Now... lets see how efficient your intercooler and intake system is... Add a map pre intercooler then post intercooler but pre throttlebody. It'll isolate where your limiting factors are. Fantastic chanel man, good on you for schooling people. Also high boost in the mid-rang then tampering it off.. guess how modern high performance turbo cars work? (Ie GTI, S3, 1205i etc) Boom. You got it baby! Make the turbo work in its most efficient range constantly. Makes for an efficient engine.
I love this series!!! Greg you're the best at making things easily accessible and giving a good foundation to learn from. Love your channel, helped me start learning how to boost my Miata!
![3000HP, 150 PSI Of Boost | What Do YOU Know About Compound Turbo Systems | Shane T [TECH TALK]](/img/n.gif)
I want to make it ***VERY CLEAR*** that any time I say "pound of air" in this video, I'm referring to the mass flow rate of "X" pounds of air per minute. NOT "X" psi of boost.
Also, I messed up a bit on the time stamps, here are accurate links:
1:50 How to Read a Compressor Map
16:18 How to Install a Turbo Speed Gauge
20:26 How to Hook Sensors up to Megasquirt
22:45 Test Pulls
24:03 Analyzing Surge
29:50 Making More Boost
31:36 Analyzing Choke
34:21 Trying to Overspin The Turbo (Myth?)
Been waiting for this video forever, awesome video man
I liked the comment about 18psi I am spending way too much time on that site and on your channel. I want to do something very similar to your car for track use. Keep up the great work.
PIN THE COMMENT GREG
@@braydoncoate9583 weird, it came unpinned
@@TheCarPassionChannel understandable 👍
The data you provide is underrated man. For the amount of effort you’ve put in it’s sad you don’t have as much recognition as the you tubers with all the flashy cars.
+1
100%
420hp to the wheels in a Miata must feel like 700hp in a new car.
It's about as fast as a 700hp Hellcat in terms of roll-on acceleration. But it feels like about 3000hp in a car made of tin foil and bubble gum
TheCarPassionChannel will you ever get a chance to drag race one? The only ‘
stang to give you trouble now is the new 500 😎
@@jefftoonstra5087 Not realy. If that boat with that much Power and so much traction barely beats the Miata on 0-60 (3.5 Seconds) 60-120 will be roughly 8 seconds due power to weight. 0-120 the miata easly wins.
I listened and bought an NA Miata. Thanks dad.
about time!
samee. Bought one last week
and THIS my friends is why I've been subscribed for so long! sweet sweet technical content explained for dummies!
I have no idea what any of this means but I'm still interested lol.
Turbo spinny ok go fast
On same boat
Up down turn around jump clap. Up down turn around jump clap
Did I just watch a tv show long TheCarPassionChannle video... yep and I enjoyed every second 🤙
Greg, this is without doubt THE BEST turbo compressor map video. A perfect real-world explanation (with actual data - no bluffing or fudging figures). It was even better than Brett's video, from GFB, on the MCM channel. Simply brilliant. Thank you.
(Huh.....how can anyone give this video a thumbs down? Shame on you!)
finally, an understandable explanation on how to read a surge map. thanks so much bro.💪
13:49 I smashed the like button so hard I broke my screen. Thanks for the content Greg.
I’ve literally sat in engineer lectures and I’ve never had such a quality of knowledge and data provided. Outstanding! 👏👏👏
Making the complex understandable! Bravo, Greg!
This is an incredible service. Sitting with a turbo’d NA that I built along side your videos, you’ve got the motherload of content that I bet other cars platforms wish they had.
I just learned SO MUCH. Would love to keep seeing in depth technical stuff
Loved the longer technical side of it, keep it up man!
Now I finally understand compressor maps, every time I went into a forum trying to grasp the concept I was welcomed with comments with more mathematical and technical jargon than a Apollo mission to the moon. Now I need to understand the exhaust side of the turbo 😂
Man I've been binge watching pretty much all your videos lately and I'm so happy to see a new upload! Keep up the great work Greg!
you just answered something that I think about everytime I consider turbo. driving two hours to get it tuned without the turbo plumbed.
Epic video, love the more detailed format.... You are going to end up getting less power to weight ratio if you keep adding sensors 😂
Craig and Craig is the most under-rated auto team on youtubes.
13min of technical content.....and I promise you..we are gonna install..the flux-capacitor on a miata..and see......
Killer!
:)
This was insane, good explaining skills and the passion
I thought this was TheCarPassionChannel? or is it TheCarPassionChannelxEngineeringExplained? Down with either!!
It's the car engineering passion channel explained. Duh
Came back to watch again after a few months. Great job simplifying the fancy engineering stuff. My brain has a hard time comprehending engineering technical documents. You made it easy. Thanks man!
I could watch these videos all day lol.
Very informative and also fun.
Hands down my fave UA-camr 👌
We ❤️ you Cragita!
I watch UA-cam all day everyday and this man is my favorite. I loose it when I see Miata dad with a new video!
I loved this video. We have a running joke at my job "pumps don't make pressure" because people don't understand flow vs pressure. Thank you for an awesome video!
Vids like this make me excited to put my car back together. Its like a rolling science experiment! I want to put sensors on everything! This info would have been cool to see back when you swapped compressor wheels on the old build. Time to start shopping for an EFR 6258 😂
Thanks Greg!
Also, pretty sure you can wire the frequency output of the BW sensor up to pt4 on a MS3x, it has an option to use hardware timers on the main processor, so it should manage to read 160K from a 6258 no problem. 0-5V only. Little to no documentation on it though, about to try it myself.
Or, you can also wire it to MAF input on maybe any MS3 and config it as a frequency MAF and do some math on the datalogs after the fact. No need to actually run MAF, you can just log it's frequency.
I was thinking the same thing.
I wired up the EFR speed sensor direct to PT4, configured for high speed input 1.75 teeth/rev on my MS3x. Seems to work fine. It quits reading around 2K RPM and I haven't maxed it out at 140K+ RPM yet either, around 1/10s update rate could be better but still plenty workable. I log a MAF while running SD and it's still working fine too.
Going to make a frequency generator and send a fixed signal just to make sure I'm getting correct data and see where it caps out.
That was a great online lesson for my upcoming test for API source inspector for rotating equipment
Yes you can with out watching the ending of the video. Excellent turbo selection.
Great video man. Covered a lot of ground here in an easy to digest way. Really demonstrated how beastly the EFR is too. Love the Southern Hooning shirt. That's a throwback. As for the over spin, I think it's that whole shop vac concept. It actually spins faster when there is a restriction. I forget the exact physics law, something something stall. You get dangerous overspeed when the car is under heavy load and a boost pipe suddenly blows though, I believe.
This is a fantastic video. I don't think it's "overly technical" at all. You do a really good job of explaining concepts and then exhibiting data to show what you mean without getting lost in the weeds. Your videos are more useful than my engineering degree when it comes to a lot of this stuff. Super interested in an rpm-variable boost video.
I just want to say that this would have been a great time to do a collaboration with Engineering Explained.
You spun my brain right up to the choke line. Luv'n it. Thank you.
Currently searching turbo sizes to replace a 2554r on a 1.6, Cram all the knowledge in my skull miata dad
Love this video hopefully more technical videos to come
Man.. your content is way better than tons of other youtubers's!
Keep on! Your car and project is a total "boost" for myself!
Name a better duo than Greg and Craig, wou guys rock 😍
Been watching for years and can't believe you still only have 105k subs and I've been trying to find a patreon or something to support you (other than the shop). Insane information, both in video and on your website. I didn't have a Miata for 2-3 years for personal reasons and I don't think I would've bought one again just now without your channel.
5/7 would pump money into Craig/Kreg/Grag/or any other variation if you had a patreon
Did I miss a video where you changed shifters? Love the content here Greg, you present so much technical info in such an easy to digest way. Keep it up!
It's a bmw shifter if I'm not mistaken. He did a video about it maybe early or middle of last year is my guess
Long Technical video approved, definitly want more!!!
I don't have an MX5 anymore, but I still watch Craig's videossss xoxoxooxx
My man Greg out here like engineering explained. Love the amount of knowledge this guy just has sitting in his mind
Excellent explanation!
Love the "every day astronaut " Tshirt...
The 18psi comment was a gem! Great work Craig, keep it up my dude!
I watched this a few months back and had a hard time w all the terms. I have been reading maximum boost by corky bell and now this video is way more fun to watch.
Man I love that intro with a passion. Also was that a compound set up for a 2v Cummins
Awesome video on the more technical side of things.
Eventhough I'm an N/A guy
for now, I really loved it man!
This video is a gold mine
I’m subscribed to tons of car channels and none of them make me half as excited as I get when I see activity from this channel.
Hands down the best explaining and favorite car stuff channel i am watcing your videos since the "garden hose" times and man does you upload quality stuff keep it up Greg i wish some day i meet you.
yes i absolutely loved the shared knowledge, although its not something i want to watch while im laying in bed trying to sleep. because now my mind is racing with the possibilities! man i cant want for my turbo so i can also " keep on boosting"
Your data is somehow "scientific" and i would approve it as a scientific experiment regarding to airflow. Very educative video too, enjoyed! Keep up!
Thank you so much for this great video explanation. It’s making me want to enjoy my fluid mechanics & thermodynamics class more than I want to.
I love this channel so much. I want to modify an ND Miata now.
Loved, loved, loved this video. The way you break concepts down into edible chunks and deliver fantastic entertainment is why you're the best dad on youtube 😁
Nice one brother. Interesting topics, I don't know much about it haha.
I do have a mate who overspun his Borg and it blew up haha. He went up a couple of sizes and now runs a speed sensor for safety. He was simply making more power than the turbo was rated to
Peak nerdiness. Good shit. Thanks for this Crai....Greg! I definitely enjoy these technical videos! Even though I'm supercharging my car for low-end oomph rather than high end zoom-zoom (even sporting that Broke&Boosted sticker) this is hella interesting and useful!
overspinning topic: If you don't use compressor like you did, there is less airflow compared to when the engine is charged so overspinning can't happen. It could happen in case you completely removed compressor rotor - there won't be any appiance which would use power generated by the turbine. But this is not the case. You are still spinning compressor wheel which is powered by the turbine and you are compressing air and blowing it back to the atmosphere. And yeah setup you tested for overspin did propably about 120-130hp because of that added extra „restriction in exhaust“ ;)
Really good stuff, thanks! I much prefer learning through your technical video than angry forum posts!
Our boy dropping knowledge on them foos
Talk about a knowledge bomb!! Thanks for your research miata dad!!
Very thorough, well explained! Thank you Greg!
like this type of video. something new, and technical with measurements. get that thing in the wind tunnel and go full time attack
Excellent presentation, easy to understand and useful data. 👍👍👍
You are a great educator. This format is great for you.
I want more technical and long videos like this. Very informative and very entertaining. Thank you so much
Compound is large turbo feeding small turbo on compressor side. With regards to overspeed, factory cars are usually smaller turbos and made of cast aluminin meaning they can reach max rpm easier in NA and the cast aluminium has a lower tensile strength. Your wheel is billet an has a higher tensile strength, though aluminium still suffers from fatigue. Running a wheel at its limit may not shatter straight away, but eventually it will, everytime you hit redline line you have put tremendous force on the wheel. If you calculate the centrifugal force of only 5grams of aluminium at a radius of 31mm at 180,000rpm that little piece of 5gram aluminium is experiencing 5500KG of force try to pull it outwards. You should displace the compressor wheel in water and calculate its volume and mass of each fin, as well as the back and entire wheel to calculate how much force it is going through. Thats 5500kg for 5 grams. That is why they make the housings so thick in case a wheel breaks.
Fantastic video. I’ve over spun a Turbo already running near its limit that then had a slight charge pipe boost leak. It’s to do with the engine load like you saw with the street vs dyno logging. Something else for you to test/prove!
Man alive. You have become a scientist! Nice work!!!!! I’ll have to watch this a few more times to digest it. Awesome content!
This is really good stuff! As an engineer I really enjoy these in depth technical videos. I hope to see more in the future! Keep it up!
In terms of using the dyno readout and boost log for the Compressor map, you mention a calculation to figure out Flywheel bhp. Maybe one way to make the compressor map more accurate would be to use a Dyno that measures transmission losses, as yours must be extremely unique! 😁
Awesome video as usual though bro ✌
Today I learned more than by going to University :D thanks man keep it going
Keep them coming Mr. Peters! Amazing videos...
You have to simulat the overspeen the turbo with a small leak! Because you need the strength off the engine to speen the turbo, but the leak for the turbo to spool up and over spean
Lol Greg, your doppelgänger character is too funny. .
Awesome video! Been researching turbos and compressor maps, and I was a bit confused about the hp to flow thing and your videos really explained all of it so well. I think I'll also buy a speed sensor for science :-)
Speechless
@TheCarPassionChannel I suspect that with the turbo disconnected (Running NA) not nearly as much air flow is passing in, and therefore Out of the head and into the turbine side of the turbo. So, there just isn't enough air to spin it up to 168k rpm.
Super big thanks for all the research you have done, and more importantly, summarizing it so that we who are not quite as bright, can understand. I have looked at turbo pressure maps before, but had no idea what they meant.
Now, to get more than 210hp from my garrett SR20DET...
People/bros need to play with turbos in the Automation game. They are guaranteed to learn a thing or two how turbos work and flow, matching exhaust housings etc!
This might be my favorite video I've seen of yours. Love the technical depth. I learned a lot :)
I really like the presentation of this video as compared to many of your previous videos. Keep up the great work!
So pumped for another vid
finally putting this info to use for my drift miata!
The 10lbs/minute equation is correct. Compressor maps are rated for 93 octane us (98 everywhere else).
For a very close approximation of what that same turbo can make on e85 you add 30ish percent to the final bhp number ie:
If the turbo can produce 40lbs/min equaling 400bhp + 30% = 520bhp on same boost pressure on e85.
Call me weird but I really enjoy this ability to read and log these kind of metrics!
All of the internets compressor map overlords have been triggered and will now bombard the comments haha
Dude this video is seriously so amazing
Good video. I like the deep dive videos and you did well.
Now this is quality content 👌
26:35 If you're losing more PSI through the intercooler, that is a good thing because that means you're losing heat
Manifold air density is the name of the game. Pounds of boost means nothing.
Normally to double the horsepower you need at least 14.7 psi additional air at ambient temperature
However, the guy that invented nitrous oxide systems, has invented cold air supercharging, where they just compress normal air, but into a tank, then when you're ready to use it, for a quarter mile run, you just run off this pressurized tank.
The air is coming in at 10 lb of boost which technically shouldn't double your horsepower except it's coming in at - 100° f. And therefore, because it's more dense, it doubles the horsepower at 10 lb instead of at nearly 15, not to mention almost no chance of detonation with temperatures that cold
Yes pounds of boost does not equal power as mentioned at 3:57.
However PSI is how you measure intercooler pressure drop. Significant pressure drop across the intercooler means it's too restrictive. 1-1.5psi is the maximum you want otherwise you're not using the right intercooler for your application. High pressure drop is not desirable.
PSI can also be used to measure compressor pressure ratio to help plot your setup on the map to determine efficiency
It's a centrifugal compressor. You'd be more likely to overspeed it by completely blocking either the inlet or outlet. Then it can't perform work, so it'll speed up. Just like a vacuum cleaner speeds up when you plug the hose.
best youtube video ever
This video was very helpful as I have not found much info on the BW turbo RPM gauge. Thanks.
Nice technical video and stupid yet very informative tests, I wish there was more like these.
I just wanna give you some additional food for thought. In your plotting you assumed the pressure ratio by having 14.5PSI of absolute pressure ie 0 restriction air filter and induction pipe. I can't tell for the induction pipe because I haven't done that yet but what I can tell is that even aftermarket air filter does restrict airflow. Not that much in my case, usually 0.2 to 0.5 psi but still, it moves the pressure ratio. Especially with restrictive/dirty air filter, once the pressure drop in front of the turbo PR moves up fast.
It might be also interesting to hook up a third MAP sensor (yet another analog in needed) in front of the turbo to really calculate the PR seen by the compressor.
Some industrial engine have sensor at the back of the airbox to indicate air filter blockage from dust, that read up to 1.5 PSI of vaccum to get a more precise measurement rather than having a 1b MAP sensor used at most on a tenth of its full scale.
Awesome vid dude... really well done.
Now... lets see how efficient your intercooler and intake system is...
Add a map pre intercooler then post intercooler but pre throttlebody.
It'll isolate where your limiting factors are.
Fantastic chanel man, good on you for schooling people.
Also high boost in the mid-rang then tampering it off.. guess how modern high performance turbo cars work? (Ie GTI, S3, 1205i etc) Boom. You got it baby! Make the turbo work in its most efficient range constantly. Makes for an efficient engine.
Love these longer more technical videos, Keep up the great work man !
I love this series!!! Greg you're the best at making things easily accessible and giving a good foundation to learn from. Love your channel, helped me start learning how to boost my Miata!
great job bro , keep it going
have to say this helped me understand a lot more thanks