jsut wondering how accurate it is compared to a wideband if its not accurate how much rich or lean is it off has anybody done tests to compare these ?

 

If this device uses the 4-wire O2 sensor for its a/f reading, then its not really accurate at all.

The voltage-to-a/f relationship for a 4-wire O2 is like a light switch - its not linear by any stretch of the imagination.

 

its almost like the autometer gauge

 

the apexi is supposed to show a read out of the ratio like 14.7 or 12.1 or just whatever the ratio is it even shows the voltage that the o2 sensor sends out jsut for the info
i think it uses the voltage comin from the o2 sensor and translates it into a air/fuel ratio go to Apexi.com and look it up so yall see wut im talkin abt

 

ya we know what your talken about but if it uses the stock 4 wire o2 sensor its not very acurate at all.

 

this would depend on how good your o2 sensor is. all it is doing is taking the voltage from your stock sensor (which is probally 10 years or so old) and converting it into a a/f ratio.