AFR for WOT and Idle question

[Phil'sC5vette]

What's a good idle AFR and what's a good WOT AFR

I want to double check my numbers of 14.5 at idle and 12.7 at WOT?


ive been using a tailpipe sniffer so how much differance will i see if i used the header bung?

[Gh0st]

For MOST street cars, stoich is where you want idle to be....some combinations may do better with a slightly richer ratio, but stoich is where it's at for most gas cars.

12.7 is fine for WOT, best way to find out is at the track or on a dyno.

Your air fuel is fine

It's commonly stated that before cats is going to be a more accurate reading than after the cats.

[ND2RACE]

Originally Posted by Phil'sC5vette

What's a good idle AFR and what's a good WOT AFR

I want to double check my numbers of 14.5 at idle and 12.7 at WOT?


ive been using a tailpipe sniffer so how much differance will i see if i used the header bung?

A/Fs sound good. Do you have cats? Typically you could end up with a leaner mixture by the time it gets to the end of the tail pipe, but this varies a bit from car to car. I'd get some readings from the collector.

[Phil'sC5vette]

this weekend, Im going to read from my O2 sensor

[WeathermanShawn]

Phil, just out of curiosity, do you mean the O2 sensor location with your wideband, or the O2 narrowband voltage reading?


..WeathermanShawn..