I finished wiring up my wet nitrous kit and it's not spraying at WOT. I wired it up exactly like the diagram below. I am using the Mallory 685 box and FPSS. When I flip the switch to arm the nitrous system the light turns on and the purge works, but the nitrous won't activate at WOT. I have the window switch set at 3000-6000 rpms. I tested both the new fuel and nitrous solenoids before I installed them and they were working fine. If anyone has any good ideas of where to start looking or checking please let me know!http://www.fquick.com/images/vehicle.../382159564.jpg

 

Where did you install the FPSS? Are the contacts in the FPSS "normally open" or "normally closed"? Is the FPSS set pressure adjustable?

 

Did you verify the throttle body is opening all the way and activating the WOT switch?

With the gas pedal, not by hand.