Boost not going up enough when boost controller is turned up

xnick101 · 11-04-2022, 01:22 PM

I am trying to fix an issue on my car, hoping someone on here can help me out.

I have a Boosted performance kit on my car. I have a GReddy profec boost controller and it's hooked up properly. If I do a pull with my boost controller off, my car goes to right around 8 psi of boost with no issues. Which is pretty close as I have 9 psi springs in my wastegates. This is fine. When I turn the controller up the boost does go up but not as much as it should. For instance, if I have the boost controller set to 65%, I only hit 11-11.5 PSI. Which is really low for having the boost controller set so high up. At 65% the car should be seeing like 16 PSI. Can anyone help figure out what is going on here? I've checked all the vacuum lines and it's all good.

Spooler · 11-04-2022, 03:05 PM

You have a boost leak. BP kits are notorious for it. Smoke test it. That or you have an exhaust leak causing it. Notorious for that too. Along with the turbo going bad.

11-04-2022, 01:22 PM	#1 (permalink)
xnick101 Base Member Join Date: Aug 2014 Location: Florida Posts: 109 Drives: 2008 6MT G37 Rep Power: 11	Boost not going up enough when boost controller is turned up I am trying to fix an issue on my car, hoping someone on here can help me out. I have a Boosted performance kit on my car. I have a GReddy profec boost controller and it's hooked up properly. If I do a pull with my boost controller off, my car goes to right around 8 psi of boost with no issues. Which is pretty close as I have 9 psi springs in my wastegates. This is fine. When I turn the controller up the boost does go up but not as much as it should. For instance, if I have the boost controller set to 65%, I only hit 11-11.5 PSI. Which is really low for having the boost controller set so high up. At 65% the car should be seeing like 16 PSI. Can anyone help figure out what is going on here? I've checked all the vacuum lines and it's all good. __________________ \|Boosted Performance Turbo G37 Coupe\|

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11-04-2022, 03:05 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,834 Drives: 2013 Nismo 370z Rep Power: 2684392	You have a boost leak. BP kits are notorious for it. Smoke test it. That or you have an exhaust leak causing it. Notorious for that too. Along with the turbo going bad.