1/4 Mile Guys, HELP. Analyze My Timeslips

RaceDvr50

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Jul 26, 2005

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May 8, 2006

#21

• May 8, 2006

• #21

P.S. Never use stock fuel pressure on injectors above 19lbs. Ford has published documentation that 24lb and up won't properly atomize below 40psi and I would suggest at least that much. I've seen guys shave up to half a second when they corrected that problem.

 

Yobi1Kanobi

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Apr 9, 2003

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May 8, 2006

#22

• May 8, 2006

• #22

i ran 44 psi vac off on my 30 #ers
it ran better with 44 # than anything else

 

N

Nagash01WS6

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Apr 15, 2003

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May 8, 2006

#23

• May 8, 2006

• #23

24# on my LS1 ran at 60 psi.

Actually, they have those set for 60 psi no matter what.

 

Black95GTS

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Jan 8, 2004

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May 8, 2006

#24

• May 8, 2006

• #24

RaceDvr50 said:

P.S. Never use stock fuel pressure on injectors above 19lbs. Ford has published documentation that 24lb and up won't properly atomize below 40psi and I would suggest at least that much. I've seen guys shave up to half a second when they corrected that problem.

Click to expand...

I don't think so. How come the stock fuel pressure setting on a 94-95 Cobra, with 24 pound injectors, is 39 PSI?

Can we see this Ford document please?

Are you saying that you've seen guys gain 1/2 a second by shifting from 39 to 40 psi?

Furthermore, the PCM's on our cars will lean / fatten the a/f ratio to nominal using the constant of 39 PSI. This is why a lot of peeps skip the AFPR and tune with stock fuel pressure with correct injector sizing.

Adam

 

gcomfx.com

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May 8, 2006

#25

• May 8, 2006

• #25

After reading the initial post..... I was on similar thinking with KC. Forget the juice.... what did your car run off the bottle compared to before and after the mods?

Get it to run right there... THEN worry about tuning the juice. BTW - I run a stock engine... 24lbers and the 125 shot of 43psi fuel with the vaccum OFF to get my best times. I just recently switched regulators and will now be able to adjust the fuel pressure with the vaccum still hooked up.

 

RaceDvr50

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#26

• May 8, 2006

• #26

Black 95 you can find this printed in the Official Ford Mustang 5.0 Technical Reference and Performance Handbook. The person I was talking about had a stock setting for a older LX of 37-38 psi. They increased to 42psi at the track nothing else and shaved half a second. That put the car into the ballpark it should have been because he had just upgraded the heads, intake, throttle body, injectors, etc. If you would like I could scan the info from the book and send it to you.