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Discussion Starter #1
My girlfriend has a 93 fox with a FI 351, .40 over, pro chomp heads, mild cam???, edelbrock victor5.0 intake & 42lb inj. It seemed super rich at idle and while cruising so the fuel pressure gauge said 42 psi with the vacuum out. I turned it down to 35 and seemed a lot better and it never popped or leaned out all the way to 6000rpm and even the plugs looked clean with a bronze strap. My ? Is sometimes the fuel pressure drops to 29 while cruising, is 35-29 psi too low for FI? I'm pretty new to the injected stuff, as always, any help is greatly appreciated.
 

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42 seems like a lot of injector for a mild NA 351. With that much injector if the MAF is off at all it could cause issues. I would have it put on a chassis dyno and maybe have a chip burnt for it.
 

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Discussion Starter #3
Thanks man, I agree. The previous owner had a n2o kit on it and I guess he thought the bigger inj would be better. HED is only a half hour away so we are deaf gonna get some Dyno time
 

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Discussion Starter #6
Not that I'm aware of, and I know the previous owner pretty well and he said he never had it tuned
 

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Discussion Starter #8
We're def taking it to HED soon. What i'm trying to ask is if 29-35psi is too low? Will the injectors work properly with this psi? Is there anything "bad" that could happen?
 
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