so i have different opinions on where to locate the fpss. before the fuel reg or in between the reg and solenoid. i have a adjustable fpss 4-7psi. if i had it set to 4psi and the nitrous regulator set to 5.5 or 6psi what would the pressure drop momentarily when the solenoid opens? you think it drop 1.5-2psi?

i have 1 fuel pump (110gph@7psi) that will feed 2 regulators off a fuel log and the fpss is on the log.

 

If your system is a return style system then it will maintain pressure. If you system dead heads at the regulators then it's very possible to see a 1.5 - 2 psi drop at WOT and nitrous activation.

 

Run a bleed jet at the solenoid. Look it up. It's how we do it with a 250 and the pressure stays solid.