What's your A/F ratio???

yote41 · Aug 16, 2017

just curious as to what you guys are getting as a/f ratios. i have 16 gt with lund tune. intake and headers back exhaust. im not seeing any carbon on my tips which ive had in previous cars. my tips actually got a little bronze after the headers. im just going by af on the dash display. im seeing 13.9-14.1 at idle and 11.9 at wot. seems like they are inline for 93 octane tune. is the dash display accurate?

Omega · Aug 16, 2017

That's pretty much what I see. I often wondered the same thing.

EFI · Aug 16, 2017

Seems a bit rich at wot, especially after a tune...but maybe Lund does his tunes very conservatively.

I see high 11s low 12s stock, but I would imagine a max power tune would have that in the mid to high 12s even pushing 13.0

Kong76 · Aug 16, 2017

I dont have a tune but im similiar 13.9-14.2 idle but way different at wot. Mine goes down to zero for a second then runs up to around 5-6.

yote41 · Aug 16, 2017

interesting. i dont mind it being rich however you would think i would have carbon showing.

Lnesprido · Aug 16, 2017

I actually just had a buddy behind be when I went WOT and he stated the rich fuel was intoxicating. So I began monitoring the A/F and it's the same at idle/normal driving 14-13.5. If I down shift and go WOT, I dip to 10.5. No Carbon, but apparently the exhaust is overpowering. I thought this was to rich. All I have is a Cat-back (FRPP Touring).

My thought was, since I have no Cold Air Intake, it's not pushing enough air through under this condition.

yote41 · Aug 16, 2017

intetesting. so its reading 10.5 on your stock dash display?

airfuel · Aug 16, 2017

I would love to see more responses to this topic. Many of you are dog rich at WOT...that is hurting power but is safer for the motor.

yote41 · Aug 16, 2017

id take safer motor over few hp

Lnesprido · Aug 16, 2017

That's correct, that is the reading on the display.

DarkestHour · Aug 16, 2017

EFI said:
Seems a bit rich at wot, especially after a tune...but maybe Lund does his tunes very conservatively.

I see high 11s low 12s stock, but I would imagine a max power tune would have that in the mid to high 12s even pushing 13.0

When we are running E10 ~12 is exactly where you want to be. That is a .85 lambda :headbang:

DarkestHour · Aug 16, 2017

Lnesprido said:
I actually just had a buddy behind be when I went WOT and he stated the rich fuel was intoxicating. So I began monitoring the A/F and it's the same at idle/normal driving 14-13.5. If I down shift and go WOT, I dip to 10.5. No Carbon, but apparently the exhaust is overpowering. I thought this was to rich. All I have is a Cat-back (FRPP Touring).

My thought was, since I have no Cold Air Intake, it's not pushing enough air through under this condition.

Most likely cat overtemp protection which enriches the mixture to cool the catalytic converters

Zimm · Aug 16, 2017

Around 10-11 running E85

JackBauer · Aug 16, 2017

is the dash afr reading coming from the o2's or is it simulated like the oil temp? i though i read somewhere that it is also simulated?

yote41 · Aug 16, 2017

i to was wondering accuracy of the dash a/f

What's your A/F ratio???

yote41

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Omega

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EFI

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Kong76

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yote41

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Lnesprido

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yote41

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airfuel

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yote41

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Lnesprido

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DarkestHour

Hi

DarkestHour

Hi

Zimm

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JackBauer

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yote41

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