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Old 11-26-2014, 11:28 AM   #1
95impreza209
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Member#: 387218
Join Date: Apr 2014
Location: Valley springs, Ca.
Default Boost leak above .5bar Loud hum/whistle from drivers side

Thanks for looking, I have a 95 Gf that I put a 95 JDM WRX EJ20G into. the car runs great with an Iwire harness merge and a robtune Z4 ecu.

I had the 20G running in my other car, a 1995 sedan and I had no issues. It was great! I fell asleep and crashed my sedan. I pulled everything from the sedan and put it into my wagon. When driving down the road and the car runs great, it idles great, it's just when under boost above .5 bar or 7-8psi it starts making a whistle or humming from the drives side. Once I go back under .5bar the noise stops.

The only two things I can think of is the gasket from the from the intercooler to the pipe under it is leaking or a leak from the brake booster somehow....? I know that air line from the manifold connects to the brake booster and helps with the braking but don't know exactly how. I replaced most gaskets but wasn't able to find one for under the intercooler to the plastic pipe that connects to the intercooler or find a part number for it.

Any help would be very much appreciated, part number, where I can buy the gasket and any other ideas of where the noise can be coming from. thank you!
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Old 11-27-2014, 01:01 PM   #2
95impreza209
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No ideas or guesses? I don't want to just start throwing parts at it but would really like to have this fixed! I had this setup in my 95 sedan then pulled it and put it into my 95 wagon. I didn't have this problem when it was in the sedan. Please help!!! Any guesses would be helpful! I cant think of anything besides the intercooler gasket or the brake booster but the brakes work just fine!
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Old 12-01-2014, 01:39 PM   #3
CRX7
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Join Date: Jan 2003
Chapter/Region: SWIC
Location: Albuquerque
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99 Impreza
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Buy a boost leak tester, and use it to find the leak. Clamp off the line to the boost controller/MBC, air it up with your compressor, and spray it down with soapy water. This is the only way to reliably find leaks other than a smoke maching.

Note: I have replaced all the rubber pieces relating to the stock intake, vacuum, and crank case vent system. They are all hard and crack and leak due to age. All rubber lines need to be replaced. I suggest you throw in a AOS while you're doing it.
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Old 12-02-2014, 10:09 AM   #4
chadwickog
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Join Date: Feb 2012
Chapter/Region: Tri-State
Location: Scranton, Pa
Vehicle:
2001 2.5 rs
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Sounds like your brake booster... I had the exact same problem with the stock booster in my GC when I did my swap. They go bad internally

But as previously said, you should test your other lines/etc
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Old 12-17-2014, 04:20 AM   #5
CRX7
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There should be a one way valve in the line to the brake booster. Thus it should not leak under boost. If the one way valve is not working or not there, you will have issues braking after boosting.
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