Bypass installation

[Peter Berrevoets]

The return of high pressure air to the low pressure side of the turbo does
not create pressure on the air metering plate. I think that's what you are
referring to.

The valve merely allows the spinning turbo to essentially 'feed itself' so
that there is less resistance to it's spinning.

Having just swapped a K26 for my K24 on the 200, I have noticed some lag
(maybe boost starts 300 to 500 rpm later) initially, but once the turbo is
spinning, the bypass valve keeps it going and lag is not noticeable.

The pressure wave, at the throttle plate when it snaps shut, is what blows
off intercooler end caps and stalls the turbo as it tries to force feed a
zero flow situation.

A bypass valve is a good install on any turbo engine. I'm running around 15
lbs of boost (had it up to 20 for a short while - but I get more power at
the lower level) and have experienced no failure of hoses or IC as yet.

My $0.02 cdn

Cheers!

Peter

Peter Berrevoets
1990 200TQ
Toronto, Canada
http://frontpage.home.net/pjberr/





> >-----Original Message-----
> >From: quattro-admin at audifans.com
> >[mailto:quattro-admin at audifans.com]On
> >Behalf Of Swann, Benjamin R. (BSWANN)
> >Sent: Thursday, September 06, 2001 2:59 PM
> >To: 'quattro at audifans.com'
> >Subject: Bypass installation
> >
> >
> >If  a bypass valve is routed from before the throttle body
> >to before the
> >turbo inlet, as I understand it should be, won't that cause
> >a problem with
> >the pressure forcing the throttle plate down to abruptly?
> >Just curious.
> >
> >Ben
> >'87 5kcstqw
> >