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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
I think of what we are calling the Deaccel Valve on the turbo motor as a good thing. It acts as a smaller BOV to keep boost up between shifts. It also may keep a turbo from getting damaged if the BOV malfunctions.


It dose pass the air around the throttle plate slowing RPM drop between shifts which is a good thing on a turbo.

If you remove it the motor will drop in RPM's faster which some like.

In your case you probably do not need it with your large BOV. Just a note, it is not typically a good idea to vent intake air to atmosphere after it has been measured by the metering assembly. A few do so and it is not the end of the world. However, it makes for a lot of extra fuel being sent down the motor and when the BOV opens and flooding the motor. EFI motors usually totally shut down fuel with throttle lift so they can do so.

Stock BOV's on CIS cars put the air back after the metering assembly and before the turbo inducer.
Old 01-05-2010, 03:36 PM
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