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Air Fuel Ratio at WOT

This is a discussion on Air Fuel Ratio at WOT within the Computer & Tuning forums, part of the LSx Technical Help Section category; Guys, If there is a such thing...what do you think the "danger zone" for the air fuel ratio is for ...

  1. #1
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    Air Fuel Ratio at WOT

    Guys,

    If there is a such thing...what do you think the "danger zone" for the air fuel ratio is for running too lean at WOT?

  2. #2
    Moderator Firebirdjones's Avatar
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    For a naturally aspirated engine???

    For a safe tune I shoot for 12.6-12.8 You can squeak out a few more HP with 12.9-13.0 but if you get much higher than that it's a bit risky. I prefer to give up a few HP and stay on the safe side, especially if running pump gas.
    Every engine is a bit different in where they make the best power. I use the track and MPH along with the wideband to see what the engine likes on a given day.

  3. #3
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    12.8 is a good afr. Any higher and it really isnt worth the risk especially for any car that is driven any more than at the track.

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    Next time you have a completely stock truck/car slap the wideband on it and notice how long GM keeps the a/f ratio at 14.7:1.
    On the trucks it's worse!
    When we dyno trucks here, the entire dyno pull is at 14.7:1.

    With GM's fuel delays based on RPM, time and torque, you'd think these engines would break more often than they do, but you'd be surprised.

    I'm sure they have their reasons.

    Like the guys said above, 12.5 to 13.0 is optimal. If you use a dyno to dial in your a/f ratio, be sure to check it at the track in real world driving conditions.

    good luck,
    allen

  5. #5
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by farmtruc View Post
    Next time you have a completely stock truck/car slap the wideband on it and notice how long GM keeps the a/f ratio at 14.7:1.
    On the trucks it's worse!
    When we dyno trucks here, the entire dyno pull is at 14.7:1.

    With GM's fuel delays based on RPM, time and torque, you'd think these engines would break more often than they do, but you'd be surprised.

    I'm sure they have their reasons.

    Like the guys said above, 12.5 to 13.0 is optimal. If you use a dyno to dial in your a/f ratio, be sure to check it at the track in real world driving conditions.

    good luck,
    allen
    look at the timing tables on those trucks and they dip down into retarded timing in the the main tables......think that's how they hold together running so lean? or do they run that low timing for emissions?

  6. #6
    TunedbyFrost.com Tuner Frost's Avatar
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    They delay PE fueling for highway/towing economy. As you guessed, the timing they run is very low by comparison to the cars.

  7. #7
    Just a farmboy V8MUSCLE's Avatar
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    i thought you wanted 14.7ish?

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by V8MUSCLE View Post
    i thought you wanted 14.7ish?
    part throttle cruising = 14.7:1
    wide open throttle you want to be richer 12.5-13:1

  9. #9
    Just a farmboy V8MUSCLE's Avatar
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    i see said the blind man...

  10. #10
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by V8MUSCLE View Post
    i see said the blind man...
    lol hey man don't feel bad, we're all still learning

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    Awaiting Activation lovedrvr's Avatar
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    how do you read the a/f mixture
    i have a predator hand held can i read it with this ?
    if not what all do i need,ill get it.

    never mind did some reading going to get this
    http://www.lethalperformance.com/98-...t-blue-p-18823
    Last edited by lovedrvr; 06-24-2009 at 05:52 AM.

  12. #12
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by lovedrvr View Post
    how do you read the a/f mixture
    i have a predator hand held can i read it with this ?
    if not what all do i need,ill get it.

    never mind did some reading going to get this
    http://www.lethalperformance.com/98-...t-blue-p-18823
    a bunch of us are running the LC-1 with a gauge. itcomes with a manual on CD ROM and pretty good instrutions to hook it up, also it if you have a laptop you can log your wideband readings with it.

  13. #13
    Moderator Firebirdjones's Avatar
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    I use the LM-1 so I can move it from car to car.

  14. #14
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    I use the LM-1 so I can move it from car to car.
    don't be so tight old man and just buy one for each car lol
    j/k

  15. #15
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by mark21742 View Post
    don't be so tight old man and just buy one for each car lol
    j/k
    Ya I'll get right on that one

  16. #16
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    Ya I'll get right on that one
    if you have more than one toy the LM-1 is the way to go

  17. #17
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by mark21742 View Post
    if you have more than one toy the LM-1 is the way to go
    Ya I use it on other peoples cars as well as my own.

  18. #18
    Member 346ci's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    I use the LM-1 so I can move it from car to car.
    I have my AFX set up to easily use on multiple vehicles, granted I had to add a little extra wiring to make it easily mobile

  19. #19
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    I feel anything over 13.50 is pushing your luck....

  20. #20
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    Quote Originally Posted by V8MUSCLE View Post
    i see said the blind man...
    to the deff guy

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