No subject

turbo and the throttle plate when the throttle is abruptly closed and the
pressurized air has nowhere to go. The air "bounces" off the closed throttle
and goes back to the turbo, slowing it significantly, and accelerating wear
on the turbo. With a BOV, the air escapes through it, and does not slow the
turbo as much.

But, BOV or no BOV, the bulk of the air isn't getting past the closed
throttle. So I don't see how the mixture would be affected by the BOV.

Am I missing something?

Cheers,
Brady Moffatt
Montreal, Quebec, Canada
83 UrQuattro with 50,000 miles
86 4ksq with 308,000km
86 4ksq parts car
72 Datsun 240Z with 180,000 miles
92 VW Golf with 200,000km FOR SALE
in middle stages of quattrosis accumulatus

----- Original Message -----
From: "Steve Sears" <steve.sears at soil-mat.on.ca>



> Taka,
> A BOV will not cause CIS to stall, since the opening of the valve will
vent
> some pressurized air ("metered air") instead of taking air in ("unmetered
> air" - aka - vacuum leak).  The result will be that the mixture will go
way
> rich while the valve is open.  I seem to recall someone posting about the
> use of BOV's and CIS - mentioning that if you see a VW making the
> characteristic "ksssshhh" noise, you'll see a blast of black smoke from
the
> tailpipe when they get back on the gas.  The result is a waste of fuel,
and
> the premature death of the catalytic convertor/oxygen sensor.  But if one
> subscribes to the "sound and fury" club, and doesn't have/need a cat/oxs,
> then go for it.  Added tip - putting a K&N on will also increase
audibility
> of the turbo (if somebody wants one, I'll sell the one on my garage
shelf -
> it's doing a great job of keeping the dust off the wood).
> Now EFI......now that's getting away from the .001% hp gains of adding a
> lighted exhaust tip and into some serious stump-pulling.....I suggest
adding
> an airhorn to the BOV to announce the presence of your "sleeper" :-D
> Steve Sears
> 1987 5kTQ - "I wish I had EFI"
> 1980 5k - "I wish I had a turbo"
> 1962 and '64 Auto Union DKW Junior deLuxes - "I wish I had a four-stroke
> engine"


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