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> Has there been any headway as far as bypass/blowoff valve installation on
> UrQs, etc?  Martin?

Yes, I have a 944 Turbo By-pass valve on my Ur-q.
It was a very easy install actually.
You can almost se it in:
Well the vacuum hose and the clamps for the in and out hoses.
The hardest part is fabricating the T pieces.
I used stock 5kt turbo intake pipe (2.5"dia) and welded couple of heater hose
pipe pieces, (the one along the engine block, as it has the flared ends and is
the same dia. as the by-pass valve inlet/outlet.

The rest is basically cutting sections of 2.5" hose (you can get those in any
truck shop, I used ovloV turbo hoses instead) to fit.
I did enlarge the hose going from the FI to the turbo at the same time.
The hose going from the intercooler to the MC throttle body became the 5kt
accordion hose (the piece after the metal T) see it at:
But you can just cut a section out of the original Ur-q intercooler/TB hose.

BTW the By-pass valve does not give you the chirping noise, just some muffled
A blow-off valve into the atmosphere would do that for you.

Martin Pajak


1983 Audi Ur-quattro (229,000 km)
1986 Audi 4000 S Quattro (420,000 km) with 5 bolt pattern