I have my N20 install done and am about to run first time use of it.

I have 350cid, 80lbs TBI injectors(2) at 20 lbs fuel pressure, and at 86% duty cycle. Assuming a 100 HP(or less for that matter) shot does anyone know how much fuel the system will need to only accomodate the N20. For instance if I wish to keep DC at 86% I will need to increase fuel pressure X amount. The jetting relationship for each is published but no mention of the grams on each delivered at jet. I can calc the lbs or grams of fuel delivery per additional lb of fuel pressure. Just need a ballpark fuel quantity relationship to N20. I will certainly monitor the DC% in my datalog.

 

2*60*sqrt(20/13) = 198 lb/hr
assuming .50 bsfc and 100% duty cycle 198/.50 = 395 bhp
assuming .50 bsfc and 90% duty cycle 395*.9 = 356 bhp.

I would say you have 0 margin for running N2O if it is normal mild 350.
TBI setups just run out injector too quickly unless it is a 4+ injector TB. And even then over-fueling becomes a problem.
I would upgrade the go with a wet shot, TB and injectors, or upgrade to port injection. All in that order.

 

I suspect my motor is about 330-350 HP currently. To start I will use the smallest jets supplied by NOS. about 50 HP. My FP reg (aeromotive) comes with 2 springs. My current spring is the weaker set at 20 lbs. The stiffer is rated 20-60 lbs. I may end up running it at higher FP (25-35) as needed. I do have VAFPR functioning.

My ECU(EBL) allows control of N20 based upon rpms(>3000 on and 5500 off shifting at 5800) as well as MPH(>30).

your calc shows "60". should that not be "80"?

 

Yes, the end result is right, but the stated equation using "60" is incorrect.
I would check and make sure your pump will do the volume you need at higher pressure. This is what always gets the boost rigs..........they increase fuel pressure and then the volume isn't there. Too lean.

VAFR is like an FMU that the boost rigs run. Personally, I would stay away from them for N2O and forced induction, but the choice is yours. With the limited injector options I would add a wet solenoid. Between the lines, solenoid, and nozzle you are probably looking at $100 worth of parts. It is up to you, but I don't think a 50HP dry shot is going to make you happy or feel that your investment was worth it.
N2O AFR is much richer than NA AFR. Keep that in mind also.

 

I am running currently a GM TPI fuel pump. My NOS brand system is wet. Fuel solenoid and N20 noids. Aeromotive FPR that has xtra outlet ports for fuel to noid. Innovate WB02 to monitor event. As stated I will start small.

My Aero actually reduces FP when vac source is hooked up. So I fuel WOT with appropriate FP and VAC reduces fuel for idle control. My ECU also supports VAFPR by changing BPC vs VAC

 

Stock TPI is good for about 40GPH at stock pressure (43 PSI), so you should be fine.
That works out to about 400BHP maxed out. I didn't realize you already had a wet kit. You should be fine for your goals then.