I have a basic stock 5.7 1991 GTA with ported plenum,air foil,SLP cold air induction,3" catback& MAT relocation.Do I need to raise my fuel pressure above 42psi.Glenn 91 L98GTA,we have the same car,any input?

[This message has been edited by cc rider (edited March 18, 2001).]

 

CC,

In theory, your relocated MAT should already be giving you slightly wider injector pulses. On the other side of the coin, the air foil might help air flow at WOT, which could cause a need for some enrichment. The freeer-flowing exhaust also helps air flow through the system, indicating the potential need for a bit more fuel. And the cold air intake adds to the situation.

If you did install an AFPR, any adjustments you might make would likely be minimal. Couple that with the acceptable variation in the factory flow ratings of injectors and the variation in stock fuel pressures, and you might be dead on accurate or way off the mark. The best way to tell would be with ET runs, an EG Ananlyzer, or an A/F meter. Unfortunately, the easiest way to change the WOT mixture is with an AFPR (there are many other, more difficult ways).

You can build your own AFPR for less than $1.00 (Can or US):

AFPR,pdf

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Later,
Vader
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"I'm'a do Things My Way - It's My way or the Highway."
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[This message has been edited by Vader (edited March 18, 2001).]

 

nope

 

I don't think it should be one of the first mods
Rick

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'88 GTA 350 Full of Leprosy (rust)
Full Exhaust, Free mods, Xtreme Energy cam, Intake Pieces and 2100 RPM TQ

13.39@102.50 MPH
1.90 Sec ----- Best 60FT
104.23 MPH -- Best Trap Speed
AIM HIGH!

 

i agree maybe after you do some other stuff like headers and exhaust upgrades

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1991 banditt2 #130 of 600
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