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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
Originally Posted by 911st View Post
Might be the de-accel valve that passes air around the throttle plate between shifts and with throttle lift.

I would probably move my boost gauge read to the other side of the throttle plate.
On all 930's the deceleration valve was not plumbed into the intercooler, instead it was bolted to and plumbed between the big intermediate manifold or origonal blow off valve housing and the intake manifold.

..and definately install an aftermarket boost gauge line to the intake manifold or brake booster line so you can see what the motor is getting.
That way the origonal boost gauge in the tach reads pressure from above the throttle butterfly, while the other one reads below the throttle butterfly and you can sort of see the pressure differential.
Old 12-11-2009, 02:42 PM
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