Originally Posted by nonnieselman

I dont think there is on..
what about a aeromotive FPR 1:1? You can dial pressure from 30psi to 70psi..


aeromotive 13129

Originally Posted by wkdivr

You can adjust the factory regulator, you need a tamperproof torx driver.

Originally Posted by oxidizr

Unlike the LS1/LS6 motor we do not have a static pressure fuel system. We have a more traditional GM fuel-pressure bypass system. This means the pump is running all the time and the regulator allows fuel to pass above a preset pressure. This pressure is adjusted like any after market Adjustable Fuel Pressure Regulator. The driver's side fuel rail/inlet has a cylindrical devise on the return side of the rail with a #10 security torx bit. You simply have to turn this screw to achieve desired pressure (clockwise=higher pressure/counter-clockwise=lower pressure.) In order to adjust the pressure you will need a fuel pressure gauge to read pressure from the schrader valve and a #10 security torx bit. Be sure to remove vacuum from the regulator to read WOT pressure before adjusting.

I have found 3-5 PSI lower = 5 rwhp on stock tune-no mods. To maintain stable nitrous operation 5-6 PSI higher for 125 (RWHP+.) I have seen much variation from factory on the settings of these regulators. I believe their is some coorolation between the color (lt.blue, yellow, pink) strip painted on the regulator and the factory preset pressure.

Richard