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kellcats521 kellcats521 is offline
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Join Date: Feb 2005
Location: Atlanta Metro
Posts: 219
Fuel pressure is another variable with EFI that can be used to work with bigger (or smaller) injectors. With an adjustable regulator, you can lower the pressure and let a bigger injector use a longer PW at idle/low RPMs to improve response. Depending on your (or your tuner's) skill, the injector size parameter (in the ECU, not the motor) can be changed 10-20% to compensate for fuel pressure changes (ie the ECU sets PW based on a 60lb/hr injector, but the motor actually has a 72 lb/hr injector running at a reduced fuel pressure).

Also, ECUs are typically set up to run either high or low impedance injectors. Once you get over ~72lb/hr, there are no high impedance injectors available AFAIK. It is, however, fairly easy to set up a low impedance injector driver with a high impedance ECU.
Old 06-15-2007, 05:51 AM
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