[200q20v] re: stock bypass valve, TBV

[Brett Dikeman]

At 1:21 AM +0000 9/14/00, Paul Friedenberg wrote:
>Mine seems to go out about every 6-12 months, but I tried a valve 
>from TAP, and subsequently bent some vanes on my brand new RS2 
>turbo, so I would advise sticking with the stock one. Just replace 
>it when you hear the WG "chatter." Blau seems to have a decent price 
>of $45. Better than a rebuilt RS2!!

Porsche makes a metal replacement valve that costs about the same. 
Call any posche parts place and ask for a TBV for a 996 twin turbo.

It's substantially more durable.

>just a passing thought, but has anyone considered putting a blow off 
>valve on in place of the turbo bypass valve (ot throttle overrun 
>cutout, what ever you want to call it..)  I really have no clue 
>about whether it would work, but it would be interesting to find out

Don't.  Blowoff valves dump metered air.  The result is a sudden, 
extreme rich condition which eats catalytic converters.  There is no 
reason to use a blowoff valve in a street car.  No reason to use one 
in a race/track car unless you've done a lot of other stuff to the 
car.  The clowns running around with blowoff valves on their A4's are 
going to be real sorry in a few years when they have trashed 
catalytic converters...of course, I bet all the A4 performance tuners 
will be more than happy to sell them "performance" cat converters to 
replace those "restrictive" cats on their cars.

Brett
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Brett Dikeman				Systems Engineer
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