[200q20v] RE: [s-cars] blowoff valve questions

Achint Sandhu sandhu at nortelnetworks.com
Mon Jun 18 12:31:02 EDT 2001

	There is a major problem with using a Blow Off Valve instead of a
bypass valve in our cars and this relates to the fact that any air entering
the turbo has already been metered by the MAF. The ECU is expecting this air
to be somewhere in the intake system.

	If the Bypass is replaced with a Blow off valve, metered air will
get lost and the ECU will assume that there is a leak somewhere in the


-----Original Message-----
From: Chris Covington [mailto:malth at umich.edu]
Sent: Monday, June 18, 2001 10:30
To: s-car-list
Cc: 200q20v
Subject: [s-cars] blowoff valve questions


Has anyone here ever run a blow-off valve instead of replacing their BPV
when it blows?  I see that many manufacturers use those from the factory
(Mitsubishi, Nissan, Mazda) and this could help eliminate our blown
hoses, etc. issues with chipped cars and/or upgraded turbos, since the
pressure is relieved instead of being re-routed.  It seems that
Audi never has though, I assume even with the RS4, RS2, etc.  Thoughts?

'91 200q20v IA3

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