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did a boost leak test

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1fast97gsx

15+ Year Contributor
4,520
17
Jul 6, 2003
Orland Park, Illinois
Last night I finally installed my 780 injectors so I decided to play with the boost. I turned it up to 19 - 20 and it was fine. Then I set the controller at 24 and floored it and the car still only ran 20 psi all the way across. ( I think it went to 1.35 bar .. but I had it set at 1.7 bar ) Anyways, I thought maybe I just need to reprogram the controller and reset it so I did. I went for a pass for it to learn the initial "base pressure" which should be 1.0 bar since that's the spring my tial 38mm has in it. Well I do the pass and the controller reads .85 bar. ( the guage seemed to be reading 14ish psi ) I just left the controller at 20 psi then and took the car home.

Today I did a boost leak test and got a VERY quiet hissing noise from between the throttle body and intake manifold. I couldn't track it down exactly, but I'm 90% sure that's where it's leaking from. The thing is the hissing was so quiet I literally had to put my ear down there and concentrate to hear it and I couldn't find anything else that was hissing. Could this really limit my boost this much? I can understand a LITTLE slower spoolup but not wanting to build any more boost is strange. Thoughts / Opinions?
 
yes. at the higher boost levels. I was having a problem with my car so I did a test. The car wouldn't boost past 7. I had a small leak like your describing. I fixed it and it went all the way up to 18 where I wanted it. Maybe when your getting on it it gets bigger or something :confused:
 
I had the same prob with my 2g, it ended up being the o rings actually in the throttle body, you could open/shut the tb and it would get louder off and on. check that first :thumb:
 
An sc61 should have no problem keeping the boost up with the leak you are describing. I bet it will end up being a setting in the profec.....
 
nanokpsi said:
An sc61 should have no problem keeping the boost up with the leak you are describing. I bet it will end up being a setting in the profec.....

I didn't think so either ... but I have no clue what else it would be. Besides even in the learning mode I only built .85 bar of boost instead of 1.0 bar.
 
hw bout the WG spring? could be not enogh springin there.
 
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