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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Works the same way as shimming the return regulator on the fuel distributor for more fuel at max delivery.

Increasing system pressure (not control pressure) increases the potential fuel pressure at the injector.

The raising rate reg would be installed on the return line from the Fuel Distributor.

For this to work the fuel pump/s must be able to deliver and operate at the higher system pressure.

Trick rarely used on 930's so you probably will not find may clues here. Comes from other turbo'd CIS cars.

Also, ultra high system pressure ( along with modified metering cones, mod fuel distributors, and larger injectors) were used by some like Volvo and Porsche on some of the old Group B turbo cars.

Still, it has potential for someone that is willing to go down that road.

Before running out and installing a reg I would test if shimming the fuel distributor (system pressure) gets more fuel. If not then the raising rate is not going to help. Possibly because the fuel pump/s are not able.

Last edited by 911st; 05-05-2013 at 02:11 PM..
Old 05-05-2013, 01:57 PM
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