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Thread: MAF Smoothing Tool for most Gen IVs

  1. #81
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    Thumbs up MAF Gen III Support

    Gen III support would be great.....that would be a big help....

  2. #82
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    Quote Originally Posted by DSteck View Post
    What this does is take your existing curve and fit a 3rd order polynomial to it, forcing an intercept at zero (basicaly assuming that at 0Hz, the airflow is 0 lb/min).
    OK I'll be the dumb guy...why isn't mine forcing the intercept to zero? I'm confused.

  3. #83
    Senior Tuner DSteck's Avatar
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    Your intercept is zero... Look at the value for 0Hz.

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  4. #84
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    I guess what I meant to ask is should I be afraid of the negative values?

  5. #85
    Senior Tuner DSteck's Avatar
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    Just don't use them. I said earlier this is going to carry some error in the lower frequencies.

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  6. #86
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    Fair enough. I think I had a converter (or both) clog on me last night anyways, sitting on the highway with the cruise control on...either that or I had the most uneventful noise free engine failure in the history of the world...it just can't stay running. I'll hopefully fix it tonight and then get back to this.

  7. #87
    This is great. Dave, did you ever do one of these for the Gen III PCM?

  8. #88
    Senior Tuner DSteck's Avatar
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    Nope. I could probably manage when I get some free time.

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  9. #89
    Quote Originally Posted by DSteck View Post
    Just don't use them. I said earlier this is going to carry some error in the lower frequencies.
    Would you just zero out the negative values?
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  10. #90
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    is this still available

  11. #91
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    Quote Originally Posted by reubone View Post
    is this still available
    I'm wondering where to find the spreadsheet...

  12. #92
    Quote Originally Posted by pannetron View Post
    I'm wondering where to find the spreadsheet...
    Me as well, thank you

  13. #93
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    Not sure if Dave wants this posted or not - honestly not even sure why anyone would want what the editor already does, but here it is - I've also never really used this, just had it in my spreadsheets... Dave if you want me to take it down, just let me know...
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  14. #94
    Ya the smoothing function is similar. I actually already put a spreadsheet together that fits a curve based on any polynomial order you desire. Then spit it back out. Pretty easy

  15. #95
    Senior Tuner DSteck's Avatar
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    I actually don't know why the attachment is gone.

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  16. #96
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    I am trying to understand the spreadsheet, when I put in my current maf settings and compared to the new curve some areas like @ 3000hz went from 6.487 to 16.38. Won't that make my fueling way off by saying there is a lot more air than before?

    Please explain.
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  17. #97
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    I just found this myself. Copied in my existing data and my values from 150Hz to 2850Hz are now negative. That can't be right, can it?

  18. #98
    Senior Tuner DSteck's Avatar
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    It's a math based operation. It isn't meant to be gospel or a perfect fix. It is intended to fill in areas where you don't have data or smooth things out.

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  19. #99
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    Quote Originally Posted by GHuggins View Post
    Not sure if Dave wants this posted or not - honestly not even sure why anyone would want what the editor already does, but here it is - I've also never really used this, just had it in my spreadsheets... Dave if you want me to take it down, just let me know...
    I'm happy that I just learned that the editor's smoothing function works nicely on non-linear curves!

  20. #100
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    this looks to be very interesting