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

Chris Covington malth at umich.edu
Mon Jun 18 12:38:06 EDT 2001

That seems to be the consensus, but wouldn't the MAF just compensate for
the fact that the air is gone?  Doesn't it measure to make sure that the
bypassed air is back in the system before it enrichens the mixture, etc.?
Or does it always use an assumption that X amount of air will be rerouted,
post MAF?

'91 200q20v

On Mon, 18 Jun 2001, Achint Sandhu wrote:

> 	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
> system.
> Cheers,
> Achint
> -----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
> 20VTers,
> 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?
> Chris
> '91 200q20v IA3
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