[BiturboS4] BOV v. DV

[Todd Sager]

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.


--
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Todd
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