The bigger injector, less fuel psi theory?

lx mike · 04-02-2006, 04:58 PM

When i did my heads and cam swap i also got a set of 24 lb injectors and had the tube for the maf to calibrate it. we got it running and set the fp at a tad over 40 psi

When i went to the dyno it was way rich (11.5) and it ended up being that 38-39 psi is where it got the a/f to around 12.8-13 range.

Dark_5.0 · 04-03-2006, 10:46 AM

My car runs great with the fuel pressure @38psi with my 24# injectors.

I tried 36# injectors @ 38psi since I wanted to eventually boost it and the injectors were a great deal. I ordered the sample tube for my mass air sensor and it was extremely rich. So back to the 24#ers I went.

88workcar · 04-03-2006, 03:42 PM

Rules to live by.

1. The boss is always right
2. If the boss is wrong, refer back to rule #1.

In my eyes, Jeff is the "BOSS"

I just went mass air, I had to try also. Jeff was right. But it is no use to me anymore, the turbo will blow through a carb. So all the fuelie stuff will be sold.

04-03-2006, 10:46 AM	#2
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: The bigger injector, less fuel psi theory? My car runs great with the fuel pressure @38psi with my 24# injectors. I tried 36# injectors @ 38psi since I wanted to eventually boost it and the injectors were a great deal. I ordered the sample tube for my mass air sensor and it was extremely rich. So back to the 24#ers I went. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

04-03-2006, 03:42 PM	#3
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Re: The bigger injector, less fuel psi theory? Rules to live by. 1. The boss is always right 2. If the boss is wrong, refer back to rule #1. In my eyes, Jeff is the "BOSS" I just went mass air, I had to try also. Jeff was right. But it is no use to me anymore, the turbo will blow through a carb. So all the fuelie stuff will be sold. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

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04-02-2006, 04:58 PM	#1
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	Re: The bigger injector, less fuel psi theory? When i did my heads and cam swap i also got a set of 24 lb injectors and had the tube for the maf to calibrate it. we got it running and set the fp at a tad over 40 psi When i went to the dyno it was way rich (11.5) and it ended up being that 38-39 psi is where it got the a/f to around 12.8-13 range. __________________ Rice Haters Club Member #101