Bypass valve part numbers

[Bob Rossato]

> I wanted to know if anyone knows what the latest vag or bosch parts
> numbers are for the turbo bypass valve. Has the current version been
> improved, or is it the same design from the 200tq?
>
> If there have been supercessions, I'd still like the old numbers, too.

The standard Audi BPV has been 034 145 710 A (Bosch p/n 0 280 142 108),
though they don't last long.

There was also the Sport quattro BPV, 035 145 710 (Bosch p/n 0 280 142 102),
which is supposedly stronger and a bit more responsive.  These were also the
same as the Porsche 944T BPV, Porsche p/n 993.110.337.50 (though this now
gets you a Bosch 108 instead of the 102, but it is cheaper than the Audi one
~$25 at Carlsen).  The Sport Q/Bosch 102 BPVs have been discontinued as best
I can tell but may still be in the pipeline somewhere.  I was able to get
one from Adirondack Auto Brokers.  While it did feel more responsive than
the stock one, it honked like a goose at 2800 rpm and part throttle so I
switched back to the Bosch 108.  The honking was supposedly also a problem
with the standard BPV (see below) though I didn't experience it.  May depend
on the application.

The latest Audi part number is 06A 145 710 N (Don't know Bosch #).  This has
been redesigned to eliminate the honking noise.  Don't know if longevity has
been addressed.  See the following TSB:

http://www.springbreakdaytonabeach.com/vwtech/www.vwwebsource.com/vwtechcont
ent/audipdf/a210001.pdf.

Bob R.