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Thread: tbss ls7 maf tuning help

  1. #1
    Junior Member 05chevy's Avatar
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    Default tbss ls7 maf tuning help

    06 tbss. 4" intake with ls7 Maf. Need help tuning it. Also need help with electric fans. Will pay someone for there time. Thank you
    05 lly 11.69 @ 115mph. stock motor, s475, 40% nozzles, lbz reg
    685hp/1100ftlb

    11 Cruze 1.4L turbo

  2. #2
    Joe (Moderator) joecar's Avatar
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    You want to correct the MAF table for the LS7 MAF and 4" plumbing...?

    Do you have a wideband (if so, which one)...?

    Can you correct the MAF table using the Calc.VET (only use the MAFcorrection portion) or AutoMAF procedures...?

  3. #3
    Junior Member 05chevy's Avatar
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    Yes correct the maf table.

    Do not have wide band yet
    Have not tried calc.vet
    05 lly 11.69 @ 115mph. stock motor, s475, 40% nozzles, lbz reg
    685hp/1100ftlb

    11 Cruze 1.4L turbo

  4. #4
    Joe (Moderator) joecar's Avatar
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    Ok, without wideband you can only correct a very limited range of the MAF table(s) using LTFT's...

    you would log LONGFT1/2 and FUELSYSA/B;
    you would create a transient filter (to exclude throttle transitions) which also excludes non Closed Loop;
    you would create a map of LONGFT1 or 2 or average to match your MAF table, apply the transient filter, and apply the map to the MAF table;
    since you have no wideband you would have to eyeball extrapolate the MAF curve to the higher frequencies...
    You REALLY do need a wideband for correcting your MAF table(s).

    Post a log of MAFFREQ2, MAF, LONGFT1/2, FUELSYSA/B, ETCTP, RPM, ECT, IAT, MAP...
    Post your tune file.
    Last edited by joecar; August 30th, 2015 at 08:04 AM.

  5. #5
    Joe (Moderator) joecar's Avatar
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    Which PCM/ECM do you have...?

  6. #6
    Junior Member 05chevy's Avatar
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    05 lly 11.69 @ 115mph. stock motor, s475, 40% nozzles, lbz reg
    685hp/1100ftlb

    11 Cruze 1.4L turbo

  7. #7
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    Patched your E-Fans ...

    PWM break points:

    • 40% - Fan1 OFF
    • 44% - Fan 1 ON
    • 85% - Fan 2 OFF
    • 90% - Fan 2 ON

    Quote Originally Posted by 05chevy View Post
    ... need help with electric fans. Will pay someone for there time ...
    A modest donation to any recognized charity would help someone else.

  8. #8
    Joe (Moderator) joecar's Avatar
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    Taz, thanks.

  9. #9
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by 05chevy View Post
    Also post a log file showing LTFT's.

  10. #10
    Junior Member 05chevy's Avatar
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    TBSS.efi
    here is a log with the intake. idle to 3000rpm. I pasted the MAF low and high frequency conversion tables from a 08 LS7 and it will idle. but still hiccups every now and then. i also have a IAT sensor break out harness on this infront of the MAF. thanks
    05 lly 11.69 @ 115mph. stock motor, s475, 40% nozzles, lbz reg
    685hp/1100ftlb

    11 Cruze 1.4L turbo

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