rxtacy

i just installed the apex'i turbo timer in my car but i really don't know what the numbers mean on the a/f and O2 modes. can anyone tell me how to read this? and what would be considered as too rich or too lean?

Travis R

14.7:1 is stoichiometric, which is generally what everyday street cars (aka: your mom's Camry) are tuned to. For more power that number can go down as low as about 12.5:1 (richer). If the output is in millivolts then the O2 sensor with read about 500mV at 14.7:1. Rich will be above 500mV, lean will be below. Unless you have a wideband O2 sensor it will be completely inacurate outside of 14.7 in either direction, so just try to keep it around there as much as you can.

Good luck

rxtacy

thanks