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  1. #1
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    Default maf pid

    How do i create a calculated pid to show commanded maf(gms/sec) divided by actual measured gms/sec as a ben factor that i can use to redo B5001(maf table)hertz vs gms/sec.

  2. #2
    Guess who's back!!!! Black02SS's Avatar
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    You don't need to. All you need to do is take the BEN PID that is for your wideband and use that. If you need help on this, just let me know what wideband you are using and I will take care of it in the next hour.

  3. #3
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    thank you its an Innovate LC-1.

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    I assume you don't need this now that TAquickness got you all covered?

  5. #5
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    Yea I'm good to go now,thanks black02ss.

  6. #6
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    Quote Originally Posted by ahall1
    Yea I'm good to go now,thanks black02ss.
    Anytime, that is what we are here for, to help the community.

  7. #7

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    Hey Black,

    I am getting ready to start playing with the MAF a bit more now that my last post turned into quite an information adventure!

    Is it possible to elaborate a bit on the best way to create a map for dialing in the MAF?

    I am still a bit confused right now with the MAF BEN factor method. I understand that the BEN factor is the percentage you are off from commanded vs. actual but what are the two factors compared and how do you tie that back to the MAF adjustment.

    Thanks

    Howard

    www.redline-motorsports.net

    1-954-703-5560

    2006 ZO6 895/866 with APS TT
    2010 SSRS Camaro HTR-900TT (798/801)
    2011 HTR-850R Camaro
    2012 ZL1 Auto (10.33@135 MPH) Video Here!

  8. #8
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    Quote Originally Posted by Redline Motorsports
    Hey Black,

    I am getting ready to start playing with the MAF a bit more now that my last post turned into quite an information adventure!

    Is it possible to elaborate a bit on the best way to create a map for dialing in the MAF?

    I am still a bit confused right now with the MAF BEN factor method. I understand that the BEN factor is the percentage you are off from commanded vs. actual but what are the two factors compared and how do you tie that back to the MAF adjustment.

    Thanks

    Howard
    The MAF Ben factor is applied to the MAF table (B5001) just the same as when you do it to the VE table. I normally will scale the MAF table 5% rich to start out just the same as I do when I start SD. This just ensures the car isn't lean. Some may do it other ways. I then make a map as has been posted. This MAP mimics the MAF table in the tuner. Here it will tell you how far off you are in relation to the commanded AFR, just as you said. So at 5000hz you see a BEN factor of .90, that tells you that it is 10% rich. The goal here is just the same as the VE table, you want to hit as many cells as possible and achieve a BEN factor clost to 1.00

  9. #9
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    The MAPs I posted above are just to give you an idea of what it looks like. The VE map isn't used after SD when tuning the MAF, I just showed it as a reference to see what your BEN looks like after you re-enable the MAF and adjust the MAF table. I just grabed this tune Howard as it isn't the final log. I looked but I can't find anymore. :(

  10. #10

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    Chad,

    I guess I need to back up for a second. Maybe to clarify the differences between a SD tune and Autotuning. Autotuning uses only the open loop fuel table as a "direct" commanding of fuel. That tied in with the ability to read actual, compare it and change it by a factor is the basic theory. Correct?

    The SD tune uses the VE table as the means of getting the PCM to not make LTRIM adjustments to keep the AFR at 14.7 for all but PE mode, which can be adjusted through PE changes and WB readings. Correct?

    In the VE SD tune I can see that after you do the tune with the MAF disabled, you would want to go back and get the MAF to agree with where you ended up without it. Correct?

    What about when you are auto tuning and you are just getting what you want for AFR because you are directly controling the fueling.

    I happen to have a stock 02 ZO6 in which we just installed a set of Kooks headers and a Vararam intake. I already noticed the LTRIMS at idle are 15 % and the AFR is reading some what lean at cruise rpms/loads. I would think most of the leaness is from the MAF being out of whack from the intake change. I'm sure the VE is fairly close and the motor is already making over 40 RWHP more and 40 RWFT over the stock setup. Now I need to fatten up the fuel a bit on top as its too lean still. This would be a perfect time to get the auto tuning working as the car is only slightly modified. It still leads me to the best approach after I get the car tuned without the MAF.

    I'm on a roll!

    www.redline-motorsports.net

    1-954-703-5560

    2006 ZO6 895/866 with APS TT
    2010 SSRS Camaro HTR-900TT (798/801)
    2011 HTR-850R Camaro
    2012 ZL1 Auto (10.33@135 MPH) Video Here!

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