does anyone knows how to read the a/f gauge in the apexi turbo timer if so could you tell me whats rich and whats lean

 

I would not trust the reading you get from the timer, but to answer your question..

Round bout .92 on the voltage is a good place to be. Higher is richer, opposite for lower.

On the A/F reading: 12ish is good. Higher numbers is lean, lower numbers is rich. Good way to figure it out is to put the car in gear and decelerate. watch what the readings do. If it is decelerating in gear, it should go lean. Hope it helps.

 

I don't know how useful this will be with a non-wideband, but your factory O2 sensor has a narrowband output.

http://plxdevices.com/M-200PlugAndPlay_productinfo.htm

-PHiZ

 

actually to get a stoichometric mixture the ratio must be around 14.7:1, i use a FJO wideband O2 sensor.

 

higher voltage is rich. less voltage is lean.

stock O2 sensor reads on a 1 volt scale. tune to keep your voltage reading between .94 to .45 volts for optimum efficiency.

http://www.apexi-usa.com/productdocu...structions.pdf

 

I recommend a wideband...but 14.7 is kinda lean on a turbo motor.

 

14.7:1 is considered stoichiometric in a vacuum with 100% oxygen to feed combustion.

real atmospheric conditions calls for 11:1 to 13:1.

he probably just read that in one of the many articles about combustion or learned it in chemistry class... it's true in the lab, but not in the real world with varying atmosphere.