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Thread: Lean Condition 1200-2000 RPM

  1. #1
    Tuner in Training
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    May 2017
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    19

    Lean Condition 1200-2000 RPM

    Hello everyone. I am almost at a loss on this one. Small background info, I own over 200 credits and have tuned a lot of prior Gen V stuff and have done some smaller Gen V jobs prior to this one just a little insight on my experience level. I have been asked to tune this 2015 C7 stingray I think, definitely not a Z06. I had no part in putting the parts on the car or any of the decision making on part choices. The cam is a Texas speed 25-TSPLT1VVT-3-32 (phaser lockout), yes I know, stock LT1 HPFP, LT4 Injectors (19420801), heads of some sort from Texas speed, and an MSD Atomic Airforce intake manifold with a Katech 103mm TB and some other aftermarket intake. I have the car driving pretty well aside from about 1200 rpm to around 2000 rpm and above .3g's of cylinder airmass it goes lean and falls on its face and fuel trims work their way up over 28%. I do in this file have SOI flat out a 280 which i know isnt great, just trying to rule that out which I had no noticeable change. I had scaled for the 32% fuel lobe and entered LT4 injector data from a 2015 Z06. Only changes I had made for the HPFP was the scaling for the fuel lobe. I have not finished the Virtual Torque stuff yet so some of that is off still, VVE and MAF seem to be very close which I did tune. Attached is a log of the current file that is attached as well. Im all open ears and appreciate any input.

    2015 Corvette 7 speed manal Dead Spot.hpt
    Dead Spot C7.hpl
    Last edited by Wondown5up; 02-07-2023 at 10:11 PM.

  2. #2
    Tuning Addict
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    You need to fix your inj timing, VVE table and several other things, but under hpfp limits - max pressure - set to max across the board. You might want to raise desired up too. Didn't look at inj data to make sure it was right, but did take a look at the hpfp setting
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
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  3. #3
    Tuner in Training
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    May 2017
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    19
    What sticks out to you on the VVE? I thought it looked pretty decent. Maybe its off due to something else that is wrong that im dealing with now? What about "several other things"?

  4. #4
    Potential Tuner
    Join Date
    Feb 2023
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    1
    Whats so bad about that cam?

  5. #5
    Tuner in Training
    Join Date
    May 2017
    Posts
    19
    Nothing wrong with the cam, the phaser lockout leaves power on the table. VVT broadends the range of the cam.