turbo issues & bypass valve
Charlie Smith
charlie at elektro.cmhnet.org
Sun Sep 9 13:21:56 EDT 2001
Earlier, c a l i b a n wrote:
>
> just what is "surging" anyway? how does it feel?
>
> lately i have noticed that when i really get on the gas
> i hear and feel kind of a rumble from the car. this is
> a 2k a4 1.8t avant with an APR chip, BTW. the rumble
> kind of sounds like it's coming from the rear of the
> car, and like i said, i can hear and feel it. it is
> pretty subtle and i am pretty sure it subsides a bit
> once i reach maximum boost. i'mn pretty much just
> talking about 4th or 5th gear, here.
Don't really know what that is, but it's not turbo surging.
> any ideas what, if anything, this might be? is this
> surging? i also heard from a friend big in the VW
> scene that there is come kind of valve that wears out
> in a year or so in chipped 1.8t cars, perhaps this is it?
What wears out, is the turbo bypass valve. Most common
symptom is a honking noise when you let off the gas, and
greater lag when you get back on the gas. There's been a lot
of conversation about the "best" Audi part number to use
for this. The topic has been beat to death over on the S car
list, and the concensus seems to be to use an aftermarket
bypass valve. I might note, NOT the T.A.P. valve which has
been reported to lose parts and shred the turbo. I'm using
a FORGE bypass valve on my S6. I believe I'm using the model
for the 2.7 biturbo, of course you only need one. Here's
a URL for this:
http://www.stratmosphere.com/forge_valves.htm
- Charlie
Charlie Smith charlie at elektro.cmhnet.org 614-471-1418
http://elektro.cmhnet.org/~charlie Columbus Ohio USA
95 S6 Quattro - 24 PSI, RS2 6 speed, and other features
96 Dodge Ram - 30 PSI, w/Cummins turbo diesel
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