I finished hooking up my N2O kit Saturday and it's great. Until I can get another fuel pump I am just sticking with 75hp shot, but I have a question. What kind of fuel pressure should I have when I'm on the hose. All motor at WOT I have 52psi fuel pressure. When I use the nitrous my pressure drops to about 48 or 49psi. Do I have anything to worry about for now? Should I try adjusting the pressure regulator? Thanks.

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87 Camaro Z28
LB9 305 TPI
Accel cap, rotor, and 8mm wires
K&N filters
1/8 mile: 9.8@69mph

91 Formula
L98 350TPI
Accel 8.8mm wires
Siamese Runners
Edelbrock Headers
Edelbrock 3" Cat-Back
Airfoil
K&N Cone Air Filter
AFPR
Shift-kit
Mallory Promaster Coil
1/8 mile: 8.8@78mph(wearing Falken streets
rolling off of the line)

 

As long as you're over 43-45 PSI then you are in the range the kit was designed for. "Off the shelf" TPI wet kits are designed for 42-50 PSI fuel pressures.
A fuel pressure safety switch set at 40 PSI is always a nice thing to have.

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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
EFI Performance Club on Yahoo
Club IROC-Z

 

Another question...should I retard my timing with 75 shot and use colder plugs or am I ok with factory delco replacement plugs and regular timing?

 

Usually you don't have to worry about colder plugs or timing retard until you reach or surpass 100 HP shots. However that assumes you have the correct timing to start with. For the price of a set, a step colder plug wouldn't be a bad idea even with under 100 HP shots.
The common retard standard is 1°-2° per 50 HP of nitrous, If using more than 100 HP.

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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
EFI Performance Club on Yahoo
Club IROC-Z