I have a DW300 pump, -6 AN feed about to change to -8 AN feed with -6 AN return with an adjustable FPR running 58-60 PSI. Nx 90mm plate system 150-200 shot.

This is a two part question here;

1) do i need a FPR for the Nitrous enrichment solenoid, and if so what should it be set at
2) are -6 AN fuel rails going to be large enough?

I'm pretty sure i can get away with this, but I need some insight. I've had it all installed for a couple of years and it works, but I still havent sprayed yet (tuning myself and it's taking forever but its almost time)

 

dont need fpr for nitrous solenoid, but make sure you are using the right jetting for the fuel pressure it is seeing, (higher efi pressure wants a different fuel jet than low carb pressure for a given nitrous jet)

im assuming youre pulling fuel from the port on the rail?

-6 would be close but you say youre switching to -8 which should be plenty

best way to test if you have enough fuel flow is run just your fuel solenoid into a can under the hood and make a WOT pull while "spraying" just the fuel solenoid and datalog it, if youre seeing the same AFR as without the fuel solenoid spraying you have enough fuel flow