Supercharged Cars - AFRs at Idle?

[Goinpro]

What is normal for an AFR range at idle? My AFRs read mid-14's to mid-15's. Is that what I should expect?


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[skwerl]

Yes, the computer will aim for 14.7 with no load.

 

[Goinpro]

And it's normal for it to bounce around in that range?


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[skwerl]

Yup, depending on how accurate your tune is and other factors. Mine also tops out at 17+ when coasting with my foot off the gas.

 

[W3bb3r04]

Yup totally normal. Also depends on which wideband you have. That will change accuracy. On decel depending on your tune, the injectors will cut off and read lean. WOT should be < 11.7 if on pump gas.

 

[rayS197]

aeroforce wideband here and reads 14.5-15.3 at idle

 

[michael.konor]

Though I'm turbo, my AutoMeter Wideband does the same as other people wrote. It goes to max lean (17+) when I let off the gas, 14.7-15.2 at idle and cruising, and 11.8 at WOT.

 

[GT E UPP]

Short answer is...Yup !

 

[onebadgsx]

Long answer.

Depends on the fuel you are running and tuned for. Also alot better and easier to read lamda. 1 at idle with any fuel reading lamda. Different fuels will show different afr at idle. Gasoline 14.7. And you have you know stoich for other fuels and make sure your afr gauge is setup for that fuel.....

 

[Timmbo]

E85 at 9.7 Lambda baby lol!

 

[onebadgsx]

I read lamda. Doesnt matter fuel. I sit at 1.00 at idle. I do run e85 also.

 

[lito]

Long answer.

Depends on the fuel you are running and tuned for. Also alot better and easier to read lamda. 1 at idle with any fuel reading lamda. Different fuels will show different afr at idle. Gasoline 14.7. And you have you know stoich for other fuels and make sure your afr gauge is setup for that fuel.....

No, every gauge is designed to read gasoline AFR by default. So it will show the same with every fuel you use. The internally work in lambda but show AFR(gas).

Suggestion, for people used to read AFR(gas) but using other fuel, do not switch, it will mess your brain.

 

[OneQwkStang]

AEM wideband here and reads bouncing around 14.5-15.3 at idle. The longer it sits idling the less it bounces around and usually sits 14.6-14.8.

 

[randeez stable]

AEM wideband here and reads bouncing around 14.5-15.3 at idle. The longer it sits idling the less it bounces around and usually sits 14.6-14.8.

Good memory Qwk. Seeing as how you haven't driven your car for about 3 months. Im impressed.