How are you testing for Turbo Back Pressure?
How are you testing for Turbo Back Pressure? Hello,
What's an affordable way to test your turbo back pressure? Are their decent kits on the market? Analog, digital? What are you using?
From my understanding you want a 1:1 ratio, At what point do you have to start worrying about too much back pressure? 2:1?
Could I use my Narrow Band O2 bung as a port to do some quick tests from?
Thanks!
What's an affordable way to test your turbo back pressure? Are their decent kits on the market? Analog, digital? What are you using?
From my understanding you want a 1:1 ratio, At what point do you have to start worrying about too much back pressure? 2:1?
Could I use my Narrow Band O2 bung as a port to do some quick tests from?
Thanks!
Sure you could use the narrow band bung. 1:1 is great while at around 2:1 you’ll see diminishing returns when the boost is turned up. I’ve heard of guys using a cheap peak and hold tire pressure gauge as a super budget route. I use a transducer tapped into the turbine housing right at the flange and monitor it through the ecu. Hope this helps, good luck.
Hello,
What's an affordable way to test your turbo back pressure? Are their decent kits on the market? Analog, digital? What are you using?
From my understanding you want a 1:1 ratio, At what point do you have to start worrying about too much back pressure? 2:1?
Could I use my Narrow Band O2 bung as a port to do some quick tests from?
Thanks!
What's an affordable way to test your turbo back pressure? Are their decent kits on the market? Analog, digital? What are you using?
From my understanding you want a 1:1 ratio, At what point do you have to start worrying about too much back pressure? 2:1?
Could I use my Narrow Band O2 bung as a port to do some quick tests from?
Thanks!
I’ll preface this with…. I have a race car, not a street car.
It’s nice to measure back pressure and log it. as it gets toward 2:1, you can open the waste gate to relieve the pressure and keep everything in its “happy place”.
As for street car, I’d think just something like upthread with a peak/hold pressure gauge on the dyno (or for a street pull for that matter) to get an idea if your setup is as efficient as it should be.
Good luck
It’s nice to measure back pressure and log it. as it gets toward 2:1, you can open the waste gate to relieve the pressure and keep everything in its “happy place”.
As for street car, I’d think just something like upthread with a peak/hold pressure gauge on the dyno (or for a street pull for that matter) to get an idea if your setup is as efficient as it should be.
Good luck
If you're running a 7875 turbo on an LS2 then you're guaranteed to run into excessive back pressure sooner or later.
My 7875 on my LS1 started running out of breath around 6,500 rpm so an LS2 will just get there quicker.
If you can get a reading on the cheap then go for it, otherwise I wouldn't worry about it, you'll see power plateau when it becomes a problem.
My 7875 on my LS1 started running out of breath around 6,500 rpm so an LS2 will just get there quicker.
If you can get a reading on the cheap then go for it, otherwise I wouldn't worry about it, you'll see power plateau when it becomes a problem.
The cheap (~$25) sensors that work with Holley for fuel and oil pressure also work for back pressure. Weld a bung to exhaust, run some coiled hardline to insulate it, configure it, away you go.
Stupid question, you wouldn't happen to have a picture of what this looks like would you?
Trending Topics
or a bit fancier with a kit like this: Earls PK0001ERL Earls Exhaust Back Pressure Plumbing Kit (holley.com)
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Thanks for the insight guys. With the $20 sensor, how could I read the value?
Could I integrate the output signal into my HP Tuners Pro interface?
What the heck is Dome Pressure?
I have the Huron Speed T4 AC Kit. For Turbo, I have the Turbonetics 7575 Billet with a 1.15AR housing.
Could I integrate the output signal into my HP Tuners Pro interface?
What the heck is Dome Pressure?
I have the Huron Speed T4 AC Kit. For Turbo, I have the Turbonetics 7575 Billet with a 1.15AR housing.
Yess!!
I’m getting ready to log back pressure with my new 70/70 turbo. I’m going with the low dollar motorsports $50 100psi transducer which is recommended over the generic $20-35 100psi transducer beloved to have more accurate reading with less noise. Then got a $12 copper tubing mechanical gauge install kit. That’s all you need. I got a 15ft harness and I’m gona pull the oil pressure and connect in on my Holley term x and I will be able to log back pressure with a run and also see how it correlates with boost etc. I could set it up as a input but not worth it as it’s just for testing and then will remove. I’m also gona run boost, pre turbo back pressure and after turbo to see how much I’m seeing in the down pipe and how that relates to the pre turbo pressure. Less than $100 but that’s with the term x ECM. My HP tuners I got the logging external connector where I can add external inputs and it worked for a WB02 I ran when I used HP tuners.
TECH Fanatic
Joined: Feb 2015
Posts: 1,080
Likes: 178