[200q20v] re: stock bypass valve, TBV

[Glen Dustin Powell]

I wondered about the blow-off valve issue and too-rich mixtures as a
result... I plan to install one on my 85 ur-q, as it does not have a
bypass-valve stock and likes to blow induction hoses above 15 PSI boost. I
think the idle-switch will tell the F/TCU the throttle is closed and it
might not inject fuel as long as the throttle is closed. This should 'fix'
any rich problems resulting from the blow-off valve letting metered air flow
by the blow-off valve.

Thoughts?

-glen


-----Original Message-----
From: 200q20v-admin at audifans.com [mailto:200q20v-admin at audifans.com]On
Behalf Of Brett Dikeman
Sent: Wednesday, September 13, 2000 9:50 PM
To: Paul Friedenberg; Brian.Link at Level3.com; fussball_3 at hotmail.com
Cc: 200q20v at audifans.com
Subject: [200q20v] re: stock bypass valve, TBV


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
--
----
Brett Dikeman				Systems Engineer
CFN(formerly iClick, Inc)			914-872-8043
120 Bloomingdale Rd.			914-872-8100(fax)
White Plains, NY 10605			http://www.iclick.com
PGP Fingerprint: 06C2 5D5B D2B4 7626  BB24 2BBC 9E4A C8B3
PGP Key location: http://pdikeman.ne.mediaone.net/pgp/brett.pgp
_______________________________________________
200q20v mailing list
200q20v at audifans.com
http://www.audifans.com/mailman/listinfo/200q20v