How is this setup going lean?

[DarkMesa8]

My car is a 95GT vert, Edelbrock heads, ported Cobra intake, crane 2031 w/ 1.7RR's, full exhaust, tons of other bolt ons.

30lb injectors, brand new Kirban AFPR, Walbro 255lph pump, new fuel filter.

At 35psi, it was running at 16:1 A/F ratio! It took 47psi at idle, with no vacuum, to get even close to 13.5 ratio. That's 30lb injectors on an N/A 302! There was definitely a power gain when I got it at 13.5:1.

What the heck is up with that? It idled between 14-15:1, is that normal? When I would let off the gas, it would go rich at 12:1.

I always thought my car was running rich, from the exhaust smell and its pigginess under 3000rpms. Plus the fact that it backfired after idling forever. When I got my AFPR, I dropped the fuel pressure from 40psi to 35psi and could've sworn I gained power.

I recalibrated the brand new LM1 a second time just to make sure. Same results.

Why do I need 47psi to get a desireable A/F mix with 30lb injectors?

 

[Rick 91GT]

I had the same issue with a 30# inj on my old 302 set-up, ,made 340RWHP and was almost out of injector at 43psi (over 90% duty cycle at 6400rpm)

I know from expierence with a 2031 that the power usually dies by 5800rpm. What MAF are you running?

 

[DarkMesa8]

I'm running the Pro-M 75mm Bullet calibrated for the 30's.

Did you have a power adder when you needed that fuel pressure? What was your 302 setup?

 

[Rick 91GT]

NA 11.80 @ 116

http://www.cardomain.com/memberpage/215816/6

 

[DarkMesa8]

Damn, that motor sounds like a big breather. My 302 combo shouldn't need the fuel that yours did... any thoughts as to why it needs so much pressure?

 

[DarkMesa8]

Somebody just told me that the Pro-M 75mm Bullet is a piece of crap... could that be the cause? I've always been a Pro-M fan.

 

[autoXr1]

You cannot run a car with 30# injectors and a 30# "calibrated" MAF with the stock 19# EEC fuel/timing maps without some drivability, AFR, and/or power output issues. Plain and simple. You MUST have the EEC's fuel/timing curves remapped due to your 36.33% load error on your combo. The '94-95 EECs run off a load table almost all the time and can be a bit more "finicky" than the '88-93 mass air EECs.

http://www.mustangworks.com/articles/electronics/InductionBlues.html Check this out. It should explain things in more detail.

 

[DarkMesa8]

So you're basically saying I'd better get off my butt and actually start using the TwEECer that's sitting on my desk, now that the wideband O2 is installed?

 

[autoXr1]

So you're basically saying I'd better get off my butt and actually start using the TwEECer that's sitting on my desk, now that the wideband O2 is installed?

 

[IndyBlk5.0]

Somebody just told me that the Pro-M 75mm Bullet is a piece of crap... could that be the cause? I've always been a Pro-M fan.

LOL, who told you that? ROFL

 

[DarkMesa8]

LOL, who told you that? ROFL

http://www.corral.net/forums/showthread.php?p=4080913#post4080913

 

[IndyBlk5.0]

posted.