fuel pressure question

sedanman · 03-15-2001, 12:16 AM

what should my fuel pressure be with my mods with the car at idle and with the vacuum hose off I am running 36 but I think I might get better performance by dropping it to 32. What do you guys think you can see my mods in the sig below

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1991 Lx sedan 5.0, 5spd, GT-40 Heads, Cobra intake, 73MM mass air, 65mm TB, FPR, 24lb injectors, E303, Headers,off road H-pipe, Flows, K&n , hurst, 3:55's, pullies, etc...
Best ET 13.5 (2.15 60ft)
Best MPH 103.9
On semi-bald street tires
New mods! electric fan, nitto drag radials, mac upper and lower control arms, HD trac-loc, lakewood 50/50's on back, shift light, centerforce dual friction, and rebuilt heavy duty T5

jimberg · 03-15-2001, 04:36 AM

How much of a performance boost did you get when you lowered it from 39 to 36psi? I would think you would be better off raising it than lowering it.

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351W 89 Mustang GT Convertible

eatsgm · 03-15-2001, 02:14 PM

I would say between 45-50 psi. I have a slightly more aggressive setup and i run with
62 psi (i had to raise fuel press up because
of high compression 10:1 but it was at 50psi
before 9:1) i guess you could get 1-3mph more
at the end of the track. the only way to know
is to do test and tune session.

03-15-2001, 12:16 AM	#1
sedanman Registered Member Join Date: Feb 1999 Location: Indianapolis, IN Posts: 963	fuel pressure question what should my fuel pressure be with my mods with the car at idle and with the vacuum hose off I am running 36 but I think I might get better performance by dropping it to 32. What do you guys think you can see my mods in the sig below ------------------ 1991 Lx sedan 5.0, 5spd, GT-40 Heads, Cobra intake, 73MM mass air, 65mm TB, FPR, 24lb injectors, E303, Headers,off road H-pipe, Flows, K&n , hurst, 3:55's, pullies, etc... Best ET 13.5 (2.15 60ft) Best MPH 103.9 On semi-bald street tires New mods! electric fan, nitto drag radials, mac upper and lower control arms, HD trac-loc, lakewood 50/50's on back, shift light, centerforce dual friction, and rebuilt heavy duty T5

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03-15-2001, 04:36 AM	#2
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	How much of a performance boost did you get when you lowered it from 39 to 36psi? I would think you would be better off raising it than lowering it. ------------------ 351W 89 Mustang GT Convertible

03-15-2001, 02:14 PM	#3
eatsgm Registered Member Join Date: Sep 1998 Location: Pont-Rouge,Quebec,Canada Posts: 55	I would say between 45-50 psi. I have a slightly more aggressive setup and i run with 62 psi (i had to raise fuel press up because of high compression 10:1 but it was at 50psi before 9:1) i guess you could get 1-3mph more at the end of the track. the only way to know is to do test and tune session.