I've got my nos hooked up, and have been spraying. I have a .026 jet for the nos, and a .042 jet in the bypass. (supposed to make a 30 shot). When I hit WOT and flip the switch, my f.p. shoots up to 120 psi. Am I wrong, or is this WAY too high?? Do I need a FPR, or can I just change the bypass jets? thanks for any help. by the way i'm s/c'ed, and have the walbro pump.

 

Whats up man? Takin' another trip to Amsterdam soon? You've inspired me to go

Mine did the same thing it shot up to 100-110 psi on the .42 jet. I tried different jets, but I ended up taking it out and its still at 80-85psi. So I just stuck a .47 jet(100 shot), which I'm sure you don't want being supercharged, and I'm still runnin rich. I'd say take out the bypass jet to see where you are.

 

your injectors are suppose to lock up at 120 PSI.. and then your engine blows..

try a higher bypass jet.. and keep going higher till it goes down

 

Take the jet out of the by pass and see what the fuel pressure does. When you do this disconnect the second nitrous solinoid so the nitrous dosent spray into the motor. NOS sells different springs for the pressure regulator (blue round thing), so you may need different spring.

A .026 jet is ~30hp. If you are tuned properly you should just be able to spray it with out the extra fuel. Put it on a window switch and shut it off at 6k.

Best to have an J&S or EGT or do some O2 tuning on a dyno to be sure.

 

So what fuel pressure do I want to be at? 80 or lower?

 

90