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Thread: 2009 lsa cadillac after dyno tune? Criuse tuning help

  1. #81
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    Quote Originally Posted by sgod1100 View Post
    Hotter air is less dense than cooler air. So there are less air molecules per unit volume in hotter air. If your tune is spot in in cooler weather I'm willing to bet your fuel trims will be pulling fuel out when its 90-100 deg. outside while in CL
    I wish it was only 100. Temps have been 110 last couple weeks

  2. #82
    Advanced Tuner jsllc's Avatar
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    Do not have that issue on my tunes.
    2012 ZL1 - Maggie Heartbeat, Port & Polish Heads, Custom Cam, Custom rotating assembly, steel sleeves No NOS and No water meth. 16psi
    810rwhp and 820rwtq 91 Octane 6200 rpm
    948rwhp and 951rwtq 105 Octane 6200 rpm
    998rwhp and 997rwtq on 60% Ethanol 6200 rpm

  3. #83
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    It is pulling fuel so I guess I'm not looking at it right. I see negative fuel trims as running richer so I try to adjust it closer to +/- 5%.
    2013 OBM A6 CTS-V Coupe
    Mods: 8.6 Lower, Spectre Performance CAI, SRI Ported THrottle Body, Billy Boat Exhaust, Stoptech Drilled & Slotted Rotors, EBC Redstuff, Cut Stock Springs, 6K HID Fogs, Full ATS-V Emblem Conversion, Full LED Conversion, Hard Line Delete W/ 3/4" Lines
    2006 Black Raven STS-V (Traded In)
    Fully Modded: 459RWHP@5888rpm/451lbft@4696rpm

  4. #84
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    so I should do all VVE tuning first then MAF, correct?

  5. #85
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    Quote Originally Posted by jsllc View Post
    Do not have that issue on my tunes.
    Sometimes I wish I could say the same! lol

  6. #86
    Advanced Tuner jsllc's Avatar
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    Guess you can do that way. I don't.
    2012 ZL1 - Maggie Heartbeat, Port & Polish Heads, Custom Cam, Custom rotating assembly, steel sleeves No NOS and No water meth. 16psi
    810rwhp and 820rwtq 91 Octane 6200 rpm
    948rwhp and 951rwtq 105 Octane 6200 rpm
    998rwhp and 997rwtq on 60% Ethanol 6200 rpm

  7. #87
    I'd bet tuning the injector tip temperature will fix you guys' ambient-temperature-related fueling swings... especially with those 1150cc injectors, Dzz88. If you tuned in the hot, 110 degree afternoon with a stock inj. tip temp curve, you're getting a lot of extra fuel dumped in there at low throttle inputs. Then, when you go for a drive at 7am the next morning when it's 70 degrees outside, you will be getting little to no extra fuel added. So basically- when you tuned it in the afternoon, you had a lot of injector pulse width adder that's no longer there in the am. If you are in open loop, it will go lean.

  8. #88
    Advanced Tuner jsllc's Avatar
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    Yep, lots of posts about this. Some ignore this and deal with wide swings other choose to make the issue worse by zeroing the table out. Considerable time was spent on this and it always proves out. It has nothing to do with the manufacturer of the injectors. It is a construct of the ECM and software running.
    Last edited by jsllc; 07-18-2019 at 12:14 AM.
    2012 ZL1 - Maggie Heartbeat, Port & Polish Heads, Custom Cam, Custom rotating assembly, steel sleeves No NOS and No water meth. 16psi
    810rwhp and 820rwtq 91 Octane 6200 rpm
    948rwhp and 951rwtq 105 Octane 6200 rpm
    998rwhp and 997rwtq on 60% Ethanol 6200 rpm

  9. #89
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    Makes total sense and probably what we are seeing. I am still on Stock injectors but will be switching to ID850's soon. I'll look for the threads and read and learn...
    2013 OBM A6 CTS-V Coupe
    Mods: 8.6 Lower, Spectre Performance CAI, SRI Ported THrottle Body, Billy Boat Exhaust, Stoptech Drilled & Slotted Rotors, EBC Redstuff, Cut Stock Springs, 6K HID Fogs, Full ATS-V Emblem Conversion, Full LED Conversion, Hard Line Delete W/ 3/4" Lines
    2006 Black Raven STS-V (Traded In)
    Fully Modded: 459RWHP@5888rpm/451lbft@4696rpm

  10. #90
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    Quote Originally Posted by jsllc View Post
    Yep, lots of posts about this. Some ignore this and deal with wide swings other choose to make the issue worse by zeroing the table out. Considerable time was spent on this and it always proves out. It has nothing to do with the manufacturer of the injectors. It is a construct of the ECM and software running.
    So, how does one go about tuning this table for larger injectors?

  11. #91
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    Quote Originally Posted by RobZL1 View Post
    I'd bet tuning the injector tip temperature will fix you guys' ambient-temperature-related fueling swings... especially with those 1150cc injectors, Dzz88. If you tuned in the hot, 110 degree afternoon with a stock inj. tip temp curve, you're getting a lot of extra fuel dumped in there at low throttle inputs. Then, when you go for a drive at 7am the next morning when it's 70 degrees outside, you will be getting little to no extra fuel added. So basically- when you tuned it in the afternoon, you had a lot of injector pulse width adder that's no longer there in the am. If you are in open loop, it will go lean.
    So adjusting that eq to higher numbers, adds more fuel?

  12. #92
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    Made a quick histogram with Injector Tip Temp and used RPM and Cylinder Airmass to plot there is quite a difference in the AM vs PM. Note sure if that is what I should watch but time to read...
    2013 OBM A6 CTS-V Coupe
    Mods: 8.6 Lower, Spectre Performance CAI, SRI Ported THrottle Body, Billy Boat Exhaust, Stoptech Drilled & Slotted Rotors, EBC Redstuff, Cut Stock Springs, 6K HID Fogs, Full ATS-V Emblem Conversion, Full LED Conversion, Hard Line Delete W/ 3/4" Lines
    2006 Black Raven STS-V (Traded In)
    Fully Modded: 459RWHP@5888rpm/451lbft@4696rpm

  13. #93

  14. #94
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    I'd like to have that...

  15. #95
    Advanced Tuner jsllc's Avatar
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    Original thread and all the work to get it done.

    https://forum.hptuners.com/showthrea...h-after-Flash/
    2012 ZL1 - Maggie Heartbeat, Port & Polish Heads, Custom Cam, Custom rotating assembly, steel sleeves No NOS and No water meth. 16psi
    810rwhp and 820rwtq 91 Octane 6200 rpm
    948rwhp and 951rwtq 105 Octane 6200 rpm
    998rwhp and 997rwtq on 60% Ethanol 6200 rpm

  16. #96
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    Question I have is how can I be rich after flash when I haven't flashed anything? The only thing that changes is outside temp. I am not changing the tune. I'm just logging.
    2013 OBM A6 CTS-V Coupe
    Mods: 8.6 Lower, Spectre Performance CAI, SRI Ported THrottle Body, Billy Boat Exhaust, Stoptech Drilled & Slotted Rotors, EBC Redstuff, Cut Stock Springs, 6K HID Fogs, Full ATS-V Emblem Conversion, Full LED Conversion, Hard Line Delete W/ 3/4" Lines
    2006 Black Raven STS-V (Traded In)
    Fully Modded: 459RWHP@5888rpm/451lbft@4696rpm

  17. #97
    Advanced Tuner jsllc's Avatar
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    It is all covered in the threads. Rich after Flash is a condition caused by injector tip temp not being set correctly. Many other items it effects. Including correctly tuning a MAF.
    2012 ZL1 - Maggie Heartbeat, Port & Polish Heads, Custom Cam, Custom rotating assembly, steel sleeves No NOS and No water meth. 16psi
    810rwhp and 820rwtq 91 Octane 6200 rpm
    948rwhp and 951rwtq 105 Octane 6200 rpm
    998rwhp and 997rwtq on 60% Ethanol 6200 rpm