Hey guys I've got a completely stock Evo and my o2 voltages are way too high for stock fuel trims. i know there is a wide spread issue of the car running extremely rich from the factor. Does anyone have any S-afc fuel maps for the evo? Or can anyone give me some figures to imput into the S-afc. I'm looking to tune the motor not blow it, so please don't give out extremely lean numbers

 

you might check the SAFC thread under modifications, otherwise the dyno is your best friend. I only think that PRUVEN PERFORMANCE are the only guys that have a successful tune on the afc. Every car is different so you can't expect to have cookie cutter AFC settings.

 

Theres a yahoo group that dedicates to SAFC. Just go to yahoo groups and do a search on safc.

Rule of thumb when tunning with a SAFC is to check both O2 voltage, and most important, the EGT temperature. PLay around with the numbers until you're close, but no surpassing, 900 degrees celcius on the egt. Check this at full throtle on 3rd gear. The best thing you can expect from a SAFC is avoiding fuel cuts. Throw some negative numbers across the rev ranges and go from there.

 

Unless you have a datalogger or use a dyno, I wouldn't mess with an AFC... you are flirting with disaster.

HTH