[BiturboS4] BOV v. DV

[john sonty]

Not only that, but it'd seem that with a BOV, the whole system
would have to start building boost from scratch after a shift,
no??

Maybe my logic is flawed but if there's air/exhaust/some
boost(??) already present or built-up in the 'system', I'd think
that right after upshifting, it would take less time to reach
max-threshold of boost before the next upshift--opposed to
having a BOV that would have released that existent air into the
atmosphere.

--- Todd Sager <todd at awe-tuning.com> wrote:
> A BOV vents boost between shifts and at part throttle to the
> atmosphere,
> hence the "whoosh" noise you hear from a car equipped with
> one.
>
> A DV vents the boost back to the intake side of the turbo.
>
> A DV is required on a Mass Air Flow (MAF) equipped car to
> prevent the
> ECU from incorrectly adapting the fueling.  With a BOV, the
> ECU sees air
> being pulled through the MAF, and assumes this air is being
> used by the
> engine, when in fact it is being vented to atmosphere.  This
> leads the
> ECU to add fuel unneccessarily, which begins to degrade
> drivability.
>
>
>
> California Fields wrote:
> >
> > [ Converted text/html to text/plain ]
> > Can someone explain to me the difference between a blow-off
> valve (BOV) and a
> > diverter valve (DV)? Also, are these things that you all
> recommend replacing
> > with aftermarket parts on the S4?  Forgive me if these
> answers were already
> > present in any FAQ...I didn't know where it was located.
> >
> > Thanks much, Carter.
>
>
> --
> **PLEASE NOTE!**
>
> As of July 8, 2002, AWE Tuning has moved to a new,
> state-of-the-art
> facility:
>
> 2385-C Maryland Rd
> Willow Grove, PA  19090
>
>
> Please direct all shipments and correspondence to this new
> address.
>
>
> If you have any questions, please do not hesitate to contact
> us.
>
>
> Regards,
> Todd
> A.W.E. Tuning
> 215-658-1670
> Orderline 888-565-2257
> http://www.awe-tuning.com
>
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