ok so i know for 91 octane 20 psi your supposed to tune to about .92-.94 o2 sensor, what he sensor supposed to read with race gas? can someone fill in the blanks? oh yeah t/b, intake, b/c, 255 and safc2 of course.


octane psi 02
91 20 .92-.94

100 23 ?

c-16 25 .88

 

Your air/fuel ratio will remain at the same target....When you add race gas it will become rich ,so just pull some fuel out with the AFC.To know exactly you need a wideband or at least a pocketlogger to determine your A/F ratio or front O2 voltage.

 

YOu need a wideband to do this accurately, so I won't give you any recommended O2s. What I will say, though, is that at the track, my O2s looks much different than they do on the street, so I can't tune to a specific O2 voltage. I add race gas, raise the boost, and then lean out slowly to get more aggressive timing. Again, you need a wideband to see your true AFRs. On race gas, you can go a bit leaner than pump gas, but 100 is not a very high octane, so you wouldn't be shooting for too lean of an AFR...

 

Run the car on a wideband and with race gas its safe to run 11.5 to 12 afr ----- 11 to 11.5 afr on 93 **** crap