[s-cars] Question about turbo chatter and BPV

[Tony]

If it's the original BPV then the diaphram could be torn. This part was
prone to failure  and there is no access to it. The last three digits of
Audi part no. is 710A. Highly recommended to replace with 710N. This is the
stock part used in TTs and maybe Porsche too. It is also $20 cheaper, at
least here in Canada - cost me Cdn$55.

Check out this link for details on BPVs...

http://www.s4biturbo.com/art-dvtests.shtml

Good luck,

Tony
96 S6

----- Original Message -----
From: "James Bufkin" <jbufkin at austin.rr.com>
To: <s-car-list at audifans.com>
Sent: Sunday, July 18, 2004 6:46 AM
Subject: [s-cars] Question about turbo chatter and BPV


> I don't own a urS4, but a good friend of mine does and I helped him
install
> a Stage 1 pair of chips yesterday morning.  The chip install went fine and
> the 287 HP was definnately there, but when I sat in his car and we went
for
> a test drive, I was hearing a definate turbo chatter at the top of the
revs
> between shifts.   I could especially hear it when driving next to parked
> cars or concrete barriers.
>
> I told him I think his BPV is faulty cause that noise is indicative of
> turbo stall, just like the rally cars used to make (I really like the
> sound, but its not good for a street car in the long scheme).   He said
his
> car has been making that noise for a year or so.   Good thing the guy
> rarely takes his car about 4K rpm when he's driving...     So we went back
> to my place and removed the BPV, It looked okay.   There was a trace of
oil
> on the side facing the turbo, which was odd, but could be explained by the
> fact we were pushing the motor to test the chip.   The vacuum line to the
> Valve was intact as well.
>
> Is the only possibility a torn boot inside the BPV?
>
> James
>
>
>
> ----------------------------------
> James Bufkin, P.E.
> Bufkin Design & Engineering, Inc.
> Austin, Texas
> ph: 512-236-8070
> fax:  512-480-5927
> cell:  512-914-2659
>
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