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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Think of the tubing and valve like a bigger version of an air bypass screw but it just bypasses air around the metering plate, not the throttle plate.

It would be plumbed into the section just after the air filter and back into the section just after the metering assembly (could use a C2 Turbo elbow). The tube would need a valve in it to control how much air passes and to reset the AFR back to this ideal after the CO screw is advanced substantially.

Again, we are not bypassing any air around the throttle plate and AFR at idle will reset to our ideal using the new valve.

Another way to approach this might be to just clip or bend up the edge of the metering plate so it dose not respond so quickly to changes in air flow and then readjust the AFR back to normal levels by advancing the CO adjustment screw.

Might be better to just bend the metering plate at the end that drops the lowest into the metering cone when it advances. This should then also help increase the range of travel of the metering arm on top of the increased travel gained from the readjustment using the CO adjustment screw. Might be a more and simpler approach.

One post here some where noted his 930 had a metering plate that was in such condition and not one seemed to understand why this might have been. This makes some sense of it.

What I we do not know is what the AFR curve will look like. I suspect modifying the metering plate would keep it more stable. On the other hand the air bypass method might make is flatter at lower rpm and fatten at higher rpm as the percentage of air through the bypass becomes a lower percentage of the total air flowed.

Just a thought that would need to be tried.

Would be cool if just bending the metering plate and readjusting the CO could get us another 10% or so more fuel as if we had lowered control pressure using a modified WUR w attachments.
Old 11-22-2009, 02:53 PM
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