WTF Boost creep on stock turbo!?

Discuss the RB20, RB25 and RB26 series engines.
garage-c
Posts: 38
Joined: Fri Jun 08, 2007 11:17 am
Car: RB25DET powered S14a
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All,

I'm having an issue with the stock turbo / wastegate actuator that is causing my car to creep from 8psi at around 4000 rpm to over 12psi at 7000. This is with my E-01 installed, but turned OFF. I have verified the lines are properly connected to the solenoid. Also, if I completely bypass the E-01's solenoid, the boost creep is still present. Think there could be a leak in the diaphragm in the stock WGA? Does anyone have a stock WGA they would be willing to sell? The creep is pissing me off because its causing me to go into R&R.

I do have an e-manage ultimate & map sensor so I can do away with the MAF, but I have not yet had time to have the car dyno tuned. It seems like anything over 4.7v~4.8v from the MAF causes the R&R to pop up in case anyone was wondering.



Also, whatever is doing this is making it a B*TCH to get the E-01 to hold boost at 10psi steadily.


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BoostFab
Posts: 3529
Joined: Wed Dec 03, 2003 8:23 am
Car: S13cp, S13fb, S14z
Location: Nismo Land
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i have an extra rb25 stock wastegate actuator; email me if you still need it; nismo{dot}tech{at}gmail{dot}com

try to run a vac line from the actuator to behind the throttle body and test to make sure that is the issue.

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Shocker
Posts: 2082
Joined: Sun Aug 01, 2004 2:40 pm
Car: 89 240sxHB rb26/30

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Once it got below 40 my stock was creeping to 12-13 psi. I just adjusted my MBC so it would creep to only 11 and still hold around 9-10 strong before the creep...


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