stanglx2002

Im getting my car on the dyno finally Thursday and im getting 3 runs and the widebrand O2 sensors on so i can check my A/F Ratio. I just wanted to make sure how to adjust the car when it runs rich and if it runs lean. I think i know but i wanted to make sure before i get it on the dyno.

Rich- Back the fuel pressure down or increase timing

Lean - Increase fuel pressure or decrease timing

Is this right or not?

vfast

no

stanglx2002

well tell me how to fix it then

wildstang87

you have to reprogram the computers fuel maps. adjusting the fuel pressure will help with WOT a little, but not enough to even deal with the other problems that come along with changing the pressure.

stanglx2002

i think im fine anyways bc it runs a little rich from what i can tell an i dont have any pinging or loss of power either. I have the pressure at 40 psi and timing at 14 and it runs good. I just wanted to make sure i could fix the problem or not with the AFPR and timing. I wasnt sure

nhdungeonracer

If your dyno shop is set-up to sell you a reprogrammable chip, he can then dial in the optimum tune for your set-up while on the dyno.

Without the reprogrammable chip, your options are kinda limited if you need to richen the mixture, or lean it out. With the chip, just about anything is open to change.

stanglx2002

well i hope i will be fine then so i can hold out until i can get the tweecer for my car in the future

Welll the car ran very rich after i got the exhaust leak fixed but after i drove the car the cimputer leaned out the mixture i just hope it didnt lean it out to much

link1235jeff

u do not hav to reprogram the coputer i have a friend with a twin turbos mustang thats a 91 mustang gt with 42 pound injecters and a aud reg and a maf caled for it with a 255in tank and all stock computer

92hatchLX

I bet that he could GREATLY benefit from a dyno tune.

link1235jeff

he owns a wb o2 is