3G TL (2004-2008)
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Best Air/Fuel Ratio??

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Old 09-01-2021, 08:22 AM
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Best Air/Fuel Ratio??

I want to hear from anyone who has dyno-tuned their J series, please. I would prefer to know the NA version best possible ratio to shoot for while street tuning with Ktuner. I have a Type S with all the usual bolt-ons.
Old 09-01-2021, 08:32 AM
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not too rich, not too lean.

it's not just one value...you'll have different values for different conditions....
-idle
-acceleration
-cruising
- wide open throttle

each condition will have different optimal A/F ratios.

you'll need to data log to get data..once you have data, you can then adjust accordingly...

the richer the air/fuel mixture; the more power to a certain degree.

Last edited by justnspace; 09-01-2021 at 08:36 AM.
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Slpr04UA6 (09-02-2021)
Old 09-01-2021, 09:27 AM
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I'm specifically talking maximum power at WOT
The rest of the fuel map is easy to set up but without a dyno to measure the results of 12.0 to 13.0 AFR I would be guessing.
I'd like to hear from someone who has tuned theirs so I have a good base line of what the average J likes.
Old 09-02-2021, 08:36 AM
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Like Justin said, it depends on a lot of different aspects. Noticed you’re in Canada, that could also effect your a/f ratios, compared to someone in Florida or Colorado with the same j series, etc…..

There is a forum member here who does e tuning I believe, I also think he only uses flashpro, I could be wrong.

Dom-gsr I believe is his username, but not 100%.
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