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Afr @ Wot??

This is a discussion on Afr @ Wot?? within the Nitrous forums, part of the LSx Technical Help Section category; I recently installed a ZEX wt kit 100hp. shot and some NGK TR6s. I went driving around with my predator ...

  1. #1
    Member 05gtoautoX's Avatar
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    Afr @ Wot??

    I recently installed a ZEX wt kit 100hp. shot and some NGK TR6s. I went driving around with my predator and monitored AFR which is 14.75:1 at anything below WOT and anywhere from 15.5:1-18:1 at WOT. That seems way lean to me, I have not sprayed yet because I want to make sure all is well first. I had a local tuner tune it for me about 4-5 months ago and he said he tuned it for a 100 shot, and that it was good to go. What do you guys think here????

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    Member 94 Formula's Avatar
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    Put the car on a dyno and let them tell you what your real AFR is.

    Don't spray the car until you check your AFR..

    DW

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    Just another Joe Eagle's Avatar
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    You should be looking to be more in the 11.8-12.2 range at WOT, depends on the RPM range to be much more specific than that. I definitely agree with you, you're running lean (if that AF is accurate).

    I'm not terribly knowledgeable on the Predators... are you using a wideband, having it guess from stock narrow band O2s, or does it get AF some other way?

    -Eagle

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    TunedbyFrost.com Tuner Frost's Avatar
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    12.7-13.1 @ WOT OFF the bottle, depending on the car and what it likes

    I like to see 11.4-11.6ish on the jug, though with a 100 shot, I wouldn't be scared at 12.0

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    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    Quote Originally Posted by Frost View Post
    12.7-13.1 @ WOT OFF the bottle, depending on the car and what it likes

    I like to see 11.4-11.6ish on the jug, though with a 100 shot, I wouldn't be scared at 12.0
    And here we're told that 12.0 is the optimal AFR for NA cars at WOT... thats what mine was tuned to...
    -Geno
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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by Silver Streak View Post
    And here we're told that 12.0 is the optimal AFR for NA cars at WOT... thats what mine was tuned to...

    If your car was tuned to 12.0:1 then there is a lot of HP left to find; I can't imagine who would have told you that.

    Where are you at in NC?

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    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    LOl.. ok so I'm an idiot.. meant 13.0...




    Outside of Jacksonville, NC.

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    Just another Joe Eagle's Avatar
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    So you think mine is fat off the bottle, Frost? Thats bone stock motor, off the bottle.



    -Eagle

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by Eagle View Post
    So you think mine is fat off the bottle, Frost? Thats bone stock motor, off the bottle.

    Click for full size

    -Eagle
    Definitely HP to be found fixing that!

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    Member 05gtoautoX's Avatar
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    had my car tuned and it's running about 12.2:1AFR at WOT N/A, I'm sure there is power to be found in the tune after reading this, but atleast it's not extemely lean.

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by 05gtoautoX View Post
    had my car tuned and it's running about 12.2:1AFR at WOT N/A, I'm sure there is power to be found in the tune after reading this, but atleast it's not extemely lean.

    I see that kind of AFR before tuning ususally... maybe you have some + LTFTs interfering with WOT.

    For autoX guys I tend to lean a bit richer, like 12.6ish:1, maybe your tuner is working along a similar school of thought. Or Maybe he found that your car made the same power from 12.2-12.6ish and left it fat to help further cool the cylinder and fight knock. I am just getting this from the autoX in your name. I'm not into autoX, but I didn't think you could even have a nitrous bottle in the car during a race anyhow.

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    Senior Member OnEbAdReDSS's Avatar
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    Quote Originally Posted by Eagle View Post
    So you think mine is fat off the bottle, Frost? Thats bone stock motor, off the bottle.

    Click for full size

    -Eagle
    what do you have as mods or is that straight stock

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    Just another Joe Eagle's Avatar
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