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Registered:
May 2002
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Re: flutter type noise?!?!?
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Mon, 15 March 2004 02:04
 
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Hello MR.2,
this fluttering you refer to is very common on cars with high flowed turbos. Sounding like a fluttering/choofing noise, its called reversion and occurs when the turbo compressor is trying to force more air into the engine than it can ingest. If you do a search on the net there is heaps of literature on this very problem.
My car suffered the same problem when the turbo was high flowed. You get the fluttering noise from a particular point in the rpm range, the boost flicks up and down dramatically while its fluttering and the power surges up and down also (not good for turbo or engine).
From lots of reading I found that the problem was the compressor trying to force more volume into the engine than it could take, the answer appeared to be to increase the exhaust flow. So I ported the wastegate (internal wastegate) and opened up the inlet on the exhaust housing. After that it flowed better, no more fluttering/reversion and gained a few more kw.
I am no expert, this is just my first hand experience, but I do suggest doing a search on the net for "turbo reversion" and read some of the more reputable sites for answers to solving your problem.
Cheers.
PS. I noticed the post above, mine was worse with the stock air box and filter than with the unifilter pod on it now, don't know why??(pre porting turbo I tried this, now its always using the pod filter).
[Updated on: Mon, 15 March 2004 02:07]
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