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Thread: IVT Terms

  1. #21
    All good haha

  2. #22
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    Can someone weigh in on a Flex Tune? It has been tuned by a shop and shows 8.21, 8.54, 8.90, 10.18, 11.90 with Stoich Going from 14.7-8.9....7.92 across was how it used to be before E85
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  3. #23
    Senior Tuner Ben Charles's Avatar
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    Quote Originally Posted by jandylee070601 View Post
    Can someone weigh in on a Flex Tune? It has been tuned by a shop and shows 8.21, 8.54, 8.90, 10.18, 11.90 with Stoich Going from 14.7-8.9....7.92 across was how it used to be before E85
    That is not correct at all!!

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  4. #24
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    Cut those in half

  5. #25
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    Quote Originally Posted by jandylee070601 View Post
    Can someone weigh in on a Flex Tune? It has been tuned by a shop and shows 8.21, 8.54, 8.90, 10.18, 11.90 with Stoich Going from 14.7-8.9....7.92 across was how it used to be before E85
    Those are the same AFR Term numbers my 2013 6.2 Flex truck has in the tune from the factory. I have a 2011 Camaro converted to flex using the same injectors as the 6.2 truck and I'm trying to determine if I should copy the AFR Terms over from the Truck to the car as the Camaro is currently 7.92 across the board. Any thoughts?

  6. #26
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    Actually would like to know this myself - I've been setting up flex tunes just leaving the ivt's stock - if they need to be changed, which does seem to help with flex fueling - I would also like to know I was scratching my head on the above post - maybe thought Ben was thinking they were doing a double half setup, because it looked right from what little data was posted?
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  7. #27
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    Anyone have info on these these. I tried changing mine from the standard gas nunbers 7.92 to the numbers go uses above for flex my trims went from 0 to -5 or -6 with the change. This is with E10 in the tank at the moment. These seem to have a great impact on fueling. Seems they could be important on a flex tune.

  8. #28
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    higher values will increase the IVT calculation, i would think that too high will cause it to richen and too low would do the same so there should be a happy middle area..?

  9. #29
    Advanced Tuner jsllc's Avatar
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    This table is a multiplier to all the open loop commanded fuel tables after Ethanol blending based on a calculated intake valve temperature (IVT) and MAP.

    As an application example, if the commanded EQRatio "Open Loop Gas in Gear" was 1.130, and the value in this table was 1.110,
    then take stoic of fuel (1 / 1.130) / 1.110 = .7972 lambda (assuming gas approx 11.70:1 AFR)
    or (1*1.130) * 1.110 = 1.2543 EQratio (assuming gas 14.68/1.2543 or 11.70:1 AFR)

    Stoic
    0 6.25 12.5 18.75 25 31.25 37.5 43.75 50 56.25 62.5 68.75 75 81.25 87.5 93.75 100 %
    Stoich 14.67822 14.32227 13.96582 13.60986 13.25293 12.89697 12.54102 12.18408 11.82813 11.47217 11.11523 10.75879 10.40283 10.04688 9.689941 9.333984 8.978027
    Last edited by jsllc; 10-13-2017 at 11:32 AM.