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  1. #1

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    AFR readings for ET137 + 4mm wheel

    Hi everyone. Just wondering if anyone has an idea to what are good AFR readings from idle to 8350 Wot?
    Presently have siemens ECU, 60 injectors, 58 static, 84 octane fuel with no ethanol in it.

    Thank you


  2. #2

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    84 USA octane!?

  3. #3

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    Quote Originally Posted by MWHC View Post
    84 USA octane!?
    Sorry, typo error.. USA 93 octane.

  4. #4
    h2jim's Avatar
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    11.9 is the wot number you want regardless of mods.

  5. #5
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by h2jim View Post
    11.9 is the wot number you want regardless of mods.
    I would go lower than that at those RPM's. More like 11.2 - 11.4. Depends on your tune.

  6. #6
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    Quote Originally Posted by troyheb View Post
    I would go lower than that at those RPM's. More like 11.2 - 11.4. Depends on your tune.
    11.2-11.4 is really rich

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  8. #7

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    Quote Originally Posted by troyheb View Post
    I would go lower than that at those RPM's. More like 11.2 - 11.4. Depends on your tune.
    Thats nuts rich.

    Iíd shoot for between 12-12.5 if your in that range with 93 youíll be golden. Hell I saw 13 at 13 psi at 8040 but the air and water where cooler and that was a factory tune. I was trying to find some of the posts from Jesus at riva I think he likes to run then a bit leaner...but my theory is you can get away with a little leaner in the 1500 motors they donít have the plasma coatings....but itís just a theory. Normally I see about 12 afr at 12 psi at about 8k normal warmer weather....thatís on an 18 tx

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    I think Jesus goes for 12.8 @wot. I'd feel safer 12-12.5 also. Maybe 12ish idle. 13ish in the middle.

  10. #9

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    Thank you everyone. I will be sending Jesus AFR readings at every 500 rpm increments. I do have a fuel station that stocks 94 octane and its not much more of a cost vs the 93. Perhaps the tune can be of a better benefit with the 94 fuel. Thank you.

  11. #10
    Mod less, ride more! troyheb's Avatar
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    SORRY GUYS. I smoked to much crack this morning. Yes 11.9ish would be perfect.

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