Okay guys my friend recently purchased an 87 firebird, heavily modified 355 TPI with a Gen 6 Accel DFI computer. The problem of the moment is that his car is running very rich. Now I have a laptop, the software and the cable to interface but I don't know exactly what I should be looking to do. If anyone could give me a quick rundown on how to adjust the fuel pressure I'd greatly appreciate it.

 

do u have a fuel pressure guage?ihere's correct method for setting fuel pressure is to:

1) connect the fuel gauge securely with no fuel leak
2) start engine, let engine idle down to proper idle RPM
3) disconnect & plug vacuum line from plenum to AFPR
4) read your fuel pressure.

Stock fuel pressure should be at 43 to 44 psi.

With mods, you might want more than stock fuel pressure. Also, realize that the fuel pressure is set for the correct AFR at WOT, not for idle or for cruizin around. While idleing and cruizin, the ECM will correct the AFR to 14.7 as long as the ECM does not have to out of range on its correction factor.i have the emic manual for accel dfi let me know if u want it and i will e-mail it to u.i am no pro at tuning it but i have gotten light years better from the help of this board,so if i could pass along what i have learned then just let me know.
mike

 

by the way,those fuel pressure instructions are from someone on this board,i didn't write them just passing them along.
mike

 

Thats how I thought it should be done, but the guy who built the engine said we need to do it through the computer. I know I can change the amount of fuel across the map by a couple points if I can figure out how to open the file. I think I want to see if he does infact have an AFPR in the engine bay before I kill myself trying to learn this computer.