EGT gauge-deceiferring A/F ratio?

[Dave]

I have a 1,400*EGT gauge and I'm wondering how you deceifer the A/F ratio per number on the gauge? I'm shooting for 13.25:1 or 13.5:1.

Thank yeh much.

[8valves]

Please see the post I made under the Viper/Show-Off dyno sheets.

Also, EGT's cannot be directly correlated to AF's. Timing can play havoc with EGT's, and yet your AF might be in the totally opposite direction.

A wideband in conjunction with an EGT is optimal.

Aaron Miller

[jckrieger]

Exactly, an EGT gage just tells you if you're going to melt something. It doesn't really tell you your A/F ratio. Now adding or removing fuel will affect EGT's, but you can't calculate A/F based on EGT as 8valves said.

[Dave]

Hmm okay as Aaron said, 11.5:1 is ideal for our cars. So with that said, is there any way to determine A/F ratio? I will be hooking up a scanner to the van to tune it all in shortly after Spring Break.

[8valves]

Hmm okay as Aaron said, 11.5:1 is ideal for our cars. So with that said, is there any way to determine A/F ratio? I will be hooking up a scanner to the van to tune it all in shortly after Spring Break.


No, I never said 11.5 is just optimal. It is a good point for power/safety on pump gas, but that's it. It depends on what your definition of optimal I guess. To me optimal is max power... but that's only goofy people like me.

Aaron Miller

[TrrboJeep]

Does retarding the timing = lower EGT's or is it the other way around? :confused:

[wallace]

Does retarding the timing = lower EGT's or is it the other way around? :confused:

Here's a pretty good read on egt's: http://www.sdsefi.com/techegt.htm

[TrrboJeep]

That's some good info! Thanks for the post Wallace. :thumb: