[BiturboS4] s4 engine noise
michael at isuzu-mods.com
Thu Oct 16 10:03:59 EDT 2003
On my 2001 S4, the turbos started whining almost immediately after
installing the X chip at 8000 miles. the turbos failed last week at
20,000 miles and there was no warning. I just hit the gas and all of a
sudden i was shooting tons of smoke out the back end. :-(
Robin Gibson wrote:
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>I run a 1999 S4 manual with ABT chip (310bhp) which was fitted 2 years ago. Over the last 6 months I have noticed more induction-type noise from the turbos; rather than the usual crisp high pitched whistle from 1500rpm, it sounds like a muted moaning sound between 1500-2000rpm, almost like one of the turbos is slow to speed up and slow down. It is most noticeable on light throttle or when decelerating. No noises or problems when driven hard. Feels like some loss of response below 3000rpm, but difficult to tell if much loss at higher revs. Sound familiar to anyone?
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