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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
I am not an expert on this but it seems to depend on the operating or system pressure you are running at.

The short answer is over 500+ CIS HP if done right.

Per one CIS expert I talked to our systems have a hard time maintaining System Pressure at high fuel delivery rates. This was confirmed by one gifted fellow Pelican that found his car did not respond with richer AFR's when he tried the old trick of shimming his Fuel Distributor for higher system pressure. When he upgraded one of his pumps to an 040 he did see better fueling up top.

Of course one dose not have to increase system pressure to get more fuel. The C2T Fuel Distributor can be modified and re-calibrated to deliver up to 30% more fuel. However this will not work with the stock WUR and might bring other issues with it.

On a car converted to EFI that might be operated in the 50-60psi fuel pressure range on boost, the stock fuel pumps are probably not going to be any issue unless you are building a very, very extreme monster.
Old 08-20-2010, 07:41 AM
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