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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269

According to Larry at CIS Flowtech, it is a dampener. A better discretion would be to call it an accumulator. It's function is to maintain or reestablish control pressure and system pressure in the Fuel Distributor with throttle lift under high demand.

Apparently when the throttle is quickly closed at high rpm-full boost it can take a sec for control pressure and system pressure to come back.

This may help reduce fuel delivery on throttle lift.

The nipple that connects to the manifold is in case the dampener should leak.

Apparently if say system pressure is something like 7 bar at idle. It might be 5.5 bar at WOT- high rpm. With throttle lift when the metering pin quickly moves up, system pressure and control pressure might drop to something like 4 bar for a sec and the lowered control pressure slows the metering pin from closing up as quickly.

This is just a guess on my part but if this is all as it seems, there might be more fuel available if we can stabilize system pressure at WOT with higher spec fuel pumps. Thierry seemed to find this to be the case on his C2 turbo. He found that shimming for more system pressure did not give him more WOT fuel. He upgraded to a 049 fuel pump and picked up more fuel up top.

Way fun stuff!!!

Last edited by 911st; 03-28-2010 at 02:10 PM..
Old 03-28-2010, 02:06 PM
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