The car I'm using is a 1993 Civic. It's obd-1 and with it chipped, the 02 can be turned off, idle air control solenoid can be adjusted or turned off, fuel values can be set or tuned to zero...there is alot that can be done here.
We'll be merely making a copy of the original oem program, zeroing out the fuel values, turning off the O2 sensor feedback(it will read but not adjust), and ramp timing. In gasoline mode everything will function as normal, no check engine lights, and will pass an diagnostics check via the check plug...however we don't have emissions here yet..
My friend that does the tuning can do up to 3 "maps" per chip, turbo, nitrous, VTEC, intake air butterfly's, propane injection(used before intercooler in boosted applications)...it's all adjustable and tuneable....even a ballet parking mode that only allows 20% throttle and 3000rpm rev limit