Turbo bypass valve

[Peter Berrevoets]

Been thinking of doing this mod for a while now but can't seem to find a
bypass valve anywhere.

I think you should have created a shorter recirculation route for the
pressurized gases. ie intake manifold on intercooler side of throttle body
to low pressure side of turbo air in.

If I follow your description, you are only creating an alternate route for
low pressure air to the turbo and haven't tapped into the hogh pressure
side.

Just a thought

Peter
1990 200TQ

> >-----Original Message-----
> >From: quattro-admin at audifans.com
> >[mailto:quattro-admin at audifans.com]On
> >Behalf Of Colin Hames
> >Sent: Saturday, November 18, 2000 12:10 PM
> >To: quattro at audifans.com
> >Subject: Turbo bypass valve
> >
> >
> >To all,
> >
> >I recently retrofitted my 5tqw with a turbo bypass valve or cut-off
> >valve as Audi likes to call them.  I had a 1" metal tee welded
> >perpendicular to the intake pipe half way from the air meter
> >boot to the
> >turbo inlet.
> >
> >I ran the car for a few days after the installation and everything
> >seemed fine.  After letting the car sit for 2 weeks, I cranked it up
> >last night for a quick run to the store ( 6 to 10 miles) and halfway
> >there I had some serious problems.  I now have oil leaking from my
> >distributor/hall sender and blue smoke drifting out the exhaust.
> >
> >Is it possible the bypass value is sent pressure back towards the air
> >meter and through the vent hoses to the valve cover,  essentially
> >pressurizing it and the crankcase, blowing valve stem seals,
> >distributor
> >seals, etc.
> >
> >Is the new issue just coincidental on a high mileage car? ( 160,000 )
> >By the way, the car is completely stock.
> >
> >Colin Hames
> >Minneapolis, MN
> >'86 5tqw
> >'90 200t
> >