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Old 02-19-2013, 03:25 PM   #44
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Drives: 13 2SS/RS 6M, 05 Mitsubishi Evo 8
Join Date: Jan 2013
Location: KU
Posts: 239
Originally Posted by GretchenGotGrowl View Post
Yeah, these mechanical High-Pressure Fuel Pumps are a PITA. Too big and they flow too much fuel at idle and low RPMs. Too small and they don't flow enough at the high RPMs. It would be nice if they had two, one that had a valve that didn't open to the fuel rails until the RPMs were above 4000, otherwise it just recirculates the fuel. I think that would solve the problem for high HP demands.
Have you guys thought of using a rising rate fuel pressure regulator? We've been using them for years in FI imports.

You mentioned wanting to be able to inject more fuel into the system aka the same way nitrous is done. We used to use sub-injectors that were RPM-reliant in FI cars in the 90s. These were nothing more than one or two fuel injectors that were tapped into the intake track and would only come on once a certain set RPM was hit. We got away from that when rising rate fuel regulators became more reliable in the early 2000s in conjunction with high-flow fuel pumps.

Just my 2 cents.

Good luck.
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