OK, here's the story. I have a 89 350 TPI with an LT4 vet cam, hypertech chip, better, valves etc. I just put a NOS dry kit on, with the fuel pressure boost and bypass line that comes off the nitrous regulator. The nitrous is injected on the motor side of my MAF sensor, and is working fine. There is a charge hitting my adjustable fuel pressure regulator also, but I can NOT get the pressure to rise when I hit the button. It spikes for a split second and then drops down to about 47psi where I have it set for normal driving. I have all the hoses clamped properly, and the bypass hooked up to the plenum, but I can't get higher fuel pressure for NOTHIN! Any suggestions. Are you NOS users using a socondary fuel pump? That's what NOS is telling me I need. What kind of fuel pressure are you running when you hit the button? Just need some help here...please.

Jason

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"Why StockBastard?" you might ask. Well...
84 Berlinetta body w/custom paint.
92 front/rear bumper and ground affects.
89 IROC 350tpi engine w/lots of mods.
87 3.73 BW possi rear w/disk brakes.
86 interior w/IROC dash.
And finally, stock Vet rims from the early 70s.(same ones used on the 69ss)
ALL IN ONE CAR!!!
13.9@98.7
soon to be juicin'
hopin' for 12s

 

To run the NOS dry system, you will need to run either a larger in-tank pump or a booster pump. I would recommend the Walbro in-tank 255ltr/hr pump. The dry system needs about 75+ psi to work and the stock pump will not hold that kind of pressure. Also, just to make sure you have the vacuum tee hooked up correctly; The line coming off the blue nitrous regulator should be routed to the either side of the tee(not the jetside), then the other side(directly opposite of the inlet) should connect to the fuel pressure regulator. Finally, the last end of the tee(the jet side) will connect to the vacuum port on the plenum. The smaller the jet the less it bleeds off into the plenum, therefore the more pressure to the fuel regulator. The larger the jet, the more it bleeds off, therefore less pressure will be going to the fuel regulator. HTH!



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David Tuschhoff
1991 RS/Z28 Camaro
Fuel injected 355ci V8.
12.47 @ 110.7mph 1.80 60'
Best mph of 111.6.
My f-body page!

 

OK, well, looks like I'm getting a pump. I'm going with the inline pump from NOS. much easier to hook up than an in tank pump, and I may be able to run it to my arming switch so it won't be running all the time. (Not that it would matter.)

Anyway, thanks for the info. I did have the thing hooked up right, just need the pump.