Turbo BACKPRESURE to BOOST Ratio!!! Are you monitoring it????
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- Опубліковано 22 сер 2024
- If not, you should be!!! Backpressure is a natural byproduct of the turbine wheel doing work spinning the compressor wheel! But if the turbine wheel is too small, cam is wrong design or you have a less efficient exhaust system, you could have way more backpressure than boost pressure!
Hey there ole Johnny Boy!!
Your videos are THE *Best* for ANYONE trying to learn more about the Big Power, Small Tire world! Very knowledgeable Racer and willing to Help and teach others from his bag of tricks and experience!!!
LOVE it, man! Keep up the good work!!! Wish there was a way I could get you More Followers!
That tire pressure gauge hack is a hell of a good idea.
Thanks man, this is gospel. The one piece of information that is missing in most sources on turbo builds.
Glad to help
Even though I don't run a turbo on my racecar it nice to learn new things. Thanks for the informative videos I enjoy them keep up the great work
Thanks
Man I figured that turbos would cause some back pressure but I never though it would be that much, man! Very informative video. Great job explaining the ratio too, makes sense, engines are just big air pumps, some are better than others.
jcnpresser if my gate doesn’t open my VG i can make 6lbs of boost at idle and 25lbs of back pressure.... sounds like a jet throttling up 😆🤦♂️
I just discovered your channel and am really enjoying the content. Very informative and easily understood tutorials. Keep up the good work!
Thanks
that tyre pressure gauge datalog trick is pure genius
Clear explanation. Thank you. Since the piston on the exhaust stroke is acting as a pump for the turbo then it makes sense that it also it taking HP away from the tires when there is more resistance if back pressure is high.
Really loving the information your giving on the channel. Keep it up.
Thanks
Never thought about the boost to back pressure ratio. Thanks for sharing!
We have mesured bavkpressure og drivepressure for years and have found out that bakcpressure is the highest when accelerating hardest in lower gears. Max hold tire pressure gauge may give confusing result as the bakcpressure should be noted around the 1/4 mile mark. IMO.
True statement, about possible confusing results! The tire pressure gauge is only gonna show the peak. I recommend making a pass looking at the boost pressure, and backpressure, et and mph. Make a change, turn the boost up and make a pass. The look at the boost, backpressure, et, mph again, did it help or hurt or not make a difference at all. It is also important to note, only make one change at a time so that you can see for sure if the change you made was good or bad.
Great information. I Always enjoy the budget stuff.
Intake manifold vs exhaust manifold pressure ratio. The closer you get the 2 to each other, enables the ability to run a n/a cam(high lift, high overlap). In the case of VTEC, you cross from low cam to high cam when the WG opens.
Great info. I'm definitely subscribing.
This is great information, thanks.
Awesome information as usual TJ!
I’ve had guys like John Bennett from Bennet racing/kbx tell me that back psi is nonsense that they don’t watch it . But I agree it’s definitely something that should be monitored
I would humbly disagree with them. On most of my cars, once I get a little over 1.5 to 1 backpressure to boost, the car slows down.
Good info
Thanks
Great content. Thanks for explaining the back pressure situation that’s involved with boosting. I have a question to ask. I’m running a 410w and want to put an on3 turbo kit on it. It’s a single T4 flange kit unfortunately. I was told it I put a huge 60mm gate or double gate along with an 1.27ar exhaust housing on a 7875 turbo I should be fine. I’m not looking to break records just to be around the 650whp reliably. Thank you for helping out.
Really cool video
Thanks
mine is 1:1 with a vgt housing with the ebp operating the wastegate ratio🤙🏻
1:1 is perfect
Turbo John took me a while to get it that way.... amazing how many people have no idea about ebp to boost
This is good info!
Love the content John. Anyway you could cover pan vacuum? And how it effects a set up?
Thank you for this information. Can you do a video on C02 on the waste gate.
Yes, I’m planning to do one on co2.
Great video
Very helpful tj thanks
John Doc sent me!
Great video!!
U put a fittnn in it lol don't u mean fitting John good vid.
I'm running out of sensor inputs watching all these videos. Time to ditch the Super Sniper and go Dominator, eh?
Data and info gathering is what makes you able to make small changes that increase the cars performance. I really think that is why cars have picked up so much power in the recent years!
@@TurboJohnRacing 100% agreed!
Technology & *Information* have absolutely REVOLUTIONOZED the whole Game!
Great info.
Inside the plumbing tee, you mentioned using a scotch Brite pad. Did you use the green scruffy one?
@0:50 shows BP fitting location..would it work as well if the fitting was installed in the header side of the flange?..basically 3" downstream.
I'm learning about back pressure now. I have a 80/88 s480 Borg Warner and I'm at approaching 2:1 already at 15 psi. I believe I need a bigger turbine wheel. It made 700whp at 13 psi. Not 100% sure what's going on yet. But I'm learning alright!
Yes, sounds like you are out of turbine.
When i bought it I thought it'd support a bit more. Im going to check pressure in the downpipe and do a boost leak test to make sure I'm not missing anything. Thanks for the input!
Hi ! I have a F40 and would like to remove the cats. So how should I adjust the turbos since there will be less back pressure ?
Too much boost can put you on the wrong area of the compressor map.
Tap the turbo housing? Can I just tap into the turbo manifold instead?
Yes
What if you don't have a Holley? Can I monitor the back pressure via a guage; like measuring boost gauge
Yes
How much scotch Brite are you packing in the t fitting
headers can cause lot of backpressure?
Yes, if way to small or too restrictive. But you could not measure it, unless the pressure port area was right at the header flange.
Which do you recommend Holley HP or Holley terminator x?
HP or Dominator preferred, but the terminator is nice
Quick question. You say copper but I wonder if nicop (nickel-copper) would work
What is that? Not familiar.
I discovered it at advance auto when doing some patch work on some brakes. Its bends easy like copper but resists kinking way better and really is pliable. According to the sales guy (old timer) this won't rust or corrode away like others, also takes a double flare so easily it makes the price difference worth it. Even my set in his ways dad loves this and his from the points and condenser days.