Car Info:
97 LT1 SS 355 (GM847 Cam, Ported Stock Casting Heads 2.02/1.60 valves)
11:1 CR, Forged SRP Pistons, Forged H Beam Rods (Eagle), Forged 4340 Crank (Eagle)
Power:
~360rwhp/370rwT

Fuel System:
42lb Racetronix Injectors
255lph Ractronix FP w/ optional harness
Metco AFPR
All other fuel components stock

The problem:
Currently installed is NOS Dry Kit. The problem with it is due to the fuel psi increase on activation (about 70-80psi) the fuel pump flow goes down below the required amount neccessary to run the nitrous kit.

See Link For Walbro 255lph Fuel Pump Flow vs Pressure Chart:
http://c4.ac-images.myspacecdn.com/i...a74f08921f.jpg


What do you think is the easiesr, best reliable option on a reasonable budget.

Solutions:

A - Change over to a wet kit
Con - Nitrous Backfires more likely

B - Install another fuel pump (Series or Parallel?)
Con - Removal of bucket (parallel) or noisy pump when in series

C - Install Boost-a-pump to boost fp voltage and flow during nitrous activation
Con - How will that high voltage affect the dependability of the pump in the long run?

D - Another viable option I haven't thought about?

 

With a pump capacity of only 38gph (144 LPH) at 12.0V, its likely you are running out of fuel. You need the Walbro high pressure 255 LPH pump, which will flow over 200 LPH at 80psi. Another alternative would be an in-line external pump. You could use a boost-a-pump to raise the voltage to the pump, but I'm not sure you can gain enough that way.

Are you sure the Metco AFPR will work OK with the slipstream from the nitrous to boost the pressure? I had one of the first LT1 dry kits from NOS back in early 1995. I thought the inline booster pump was bad, and took the pump to the NOS shop to have it flow tested. Met spec (its a Bosch 208, that I am still using 15 years later). We traced the problem to the AFPR, and I don't remember the brand. Put the stock FPR back in, and the kit worked perfectly. Just a thought.

 

I was under the impression that Racetronix's 255lph Intank Pump was a hi-pressure Walbro pump.

 

I can't find a copy of the high pressure curve, but it flows a lot more than the curve you linked. This is the copy that is included on virtually every website that sells the Walbro 255 LPH pumps:
I have no idea what Racetronix sells.