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Old 08-17-2004, 10:37 AM   #1
timo
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Default Screeching noise at WOT when shifting gears

Hi guys,
Lately I have noticed that my car is making another noise that bothers me a little bit and want to see what you guys think about it. Basically when I am at WOT and shift gears at after 6k rpms I hear this screeching noise for probably less than a second. It happens after I fully press the clutch to shift. It's only for a split second and you have to really listen carefuly to hear it. I am hoping that it's not the turbo or the engine, but am not sure at all. Coult it be that the stock BOV is going bad and starts leeking(I am hoping it's this one as it would be the cheapest to fix), or could it be the wastegate, or could it be the engine(I hope not), or maybe the turbo? I am at Cobb stage 2 and am reaching target boost and everything else seems normal, and my car has only 25k miles on it.
All responses are greatly appreciated
thanks

martin

p.s. I should add that I have had an uppipe leak before and I don't think this is the case right now. The leak that I had was fixed a long time ago and hasn't leaked since.
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Old 08-17-2004, 10:40 AM   #2
sufx
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is it JUST when you press the clutch in, or does it screetch when you shift?
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Old 08-17-2004, 10:43 AM   #3
timo
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when the clutch is fully engaged before I shift the shifter
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Old 08-17-2004, 10:45 AM   #4
cdvma
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Are you using an aftermarket BOV? If you are, what you hear may be compressor surge. It kinda sounds like a lazer beam in a sifi movie.
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Old 08-17-2004, 10:46 AM   #5
timo
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That's what it sounds like(laser beam in a sci-fi movie), and I am not using an aftermarket bov

Last edited by timo; 08-17-2004 at 10:59 AM.
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Old 08-17-2004, 11:03 AM   #6
timo
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I have never heard what a compressor surge sounds like, but for some reason I have the feeling that this is exactly what happends. If it is a compressor surge, how do I go about fixing it? What's causing it? Please guys help, I am worried about my car
thanks
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Old 08-17-2004, 11:17 AM   #7
cdvma
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Got a local buddy with a WRX that you can trade valves with? Try his out to see if thats the issue. I dont know if the stock ones are serviceable but you can also probably pick up a used one for really cheap if thats what it comes down to.
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Old 08-17-2004, 11:45 AM   #8
timo
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cdvma, I'll try that.
In the meantime is there anything else that I can do to try to pinpoint the porblem?
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Old 08-17-2004, 12:54 PM   #9
Alizarin
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Would a cracked or split return line from the BOV->intake cause a screech from the leak?
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Old 08-17-2004, 01:33 PM   #10
cdvma
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Quote:
Originally Posted by Alizarin
Would a cracked or split return line from the BOV->intake cause a screech from the leak?
That is a possibility as well.
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Old 08-17-2004, 02:03 PM   #11
timo
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I'll have to check that. Will let you know later on tonight.
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