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09-25-2024, 04:41 AM
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#1 |
 Drives: 2020 Chevy Camaro ZL1 1LE Join Date: Nov 2017
Location: Earth
Posts: 137
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Zl1 cutting power
So my tuner is looking into this issue as well but would like some other opinions. My car recently went thru a heads and cam package.
Mod: Maggy 2650, heads and cam, bolt on with toohighpsi port injections. When I go to WOT, the car shift fine and makes good power until the 6-7 shift. When the car is trying to make the 6-7 shifts, it seems to just over rev and then close the throttle body, even though the accel pedal position is still 99%. Have anyone had a similar issue and what was your resolution? Is there anything I should check for in the tune? Everything looks good up til the part the throttle starts closing. Do you think the trans is on its way out? Car have 23k miles so I thought it should still be ok for alittle while longer. Any advice is appreciated. |
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09-25-2024, 05:52 AM
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#2 |
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Sarcasm loading --------
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Was the transmission also sent out for modification for tuning as well?
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"The salesman actually told me to stop getting it sideways during the test drive"
2018 MBM ZL1 1LE - 652 rwhp, 588 rwtq SAE 2014 CRT ZL1 574 rwhp, 537 rwtq - SOLD 2010 IBM SS Camaro VVT L99 w/ TR6060 swap, 489 rwhp, 444 rwtq - SOLD |
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09-25-2024, 06:20 AM
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#3 |
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Drives: 2020 Chevy Camaro ZL1 1LE Join Date: Nov 2017
Location: Earth
Posts: 137
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Trans is stock but the tcm has been tuned.
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09-25-2024, 06:22 AM
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#4 |
Drives: 2018 ZL1 A10 Nightfall Gray Join Date: Apr 2016
Location: Indiana
Posts: 114
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Sounds like transmission issue to me.
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09-25-2024, 06:44 AM
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#5 |
    
Drives: 2023 ZL1 Join Date: Dec 2022
Location: Columbus, Ohio
Posts: 1,287
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I had a similar issue: Car over revved by a lot shifting from 6th to 7th. It must have been a glitched TCM tune flash. My laptop was running on battery power and I think it might have been in power saving mode (rookie mistake, I could have bricked the TCM). Here is what happened: I flashed the TCM and took it for a test run. The trans over revved in 6th. Came back to the garage reflashed my prior TCM tune with laptop plugged into power. Took the car out for a test run and all was fine. I re-flashed the newest TCM tune that I had the issue with, with computer plugged in to power and this time it was fine, no issues.
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Katech Track Day CAM 38%•BTR Dual Valve Springs•Johnson Lifters•Trend 3/8 Chromoly Pushrods• VVT Del•CNC Heads•AFM Delete• C5-R Timing Chain•Katech Oil Pump•Katech 112mm•Maggie 2650 3.25” Upper/ATI SD w/10.32” +20%•10 Rib Belt•RFBG•FI IC Stage 2•THPSI Port w/875cc Inj•Katech Dual Fuel Pump•DSX Aux Pump•SW 2" Headers w/Legend NPP•GESI UHO 4.5" CATs•Brisk RR14S Plugs•BMR Motor Mounts•BMR Cradle Lockout &Bushings Kit•BMR Rear Suspension & 15" Conversion•DSS 1pc DS•RPM 6-Point Roll Cage•10lb FireSense+ w/4Fire SFI 17.1 Fire Sys•Weld Forged Vitesse Rear 17x10 Beadlocks-Front 18x6•Unlocked TCM
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09-25-2024, 09:00 AM
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#6 | |
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Sarcasm loading --------
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Quote:
I was also thinking TCM flash issue.
__________________
"The salesman actually told me to stop getting it sideways during the test drive"
2018 MBM ZL1 1LE - 652 rwhp, 588 rwtq SAE 2014 CRT ZL1 574 rwhp, 537 rwtq - SOLD 2010 IBM SS Camaro VVT L99 w/ TR6060 swap, 489 rwhp, 444 rwtq - SOLD |
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10-07-2024, 01:24 PM
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#7 | |
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Drives: 2020 Chevy Camaro ZL1 1LE Join Date: Nov 2017
Location: Earth
Posts: 137
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Quote:
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10-07-2024, 01:54 PM
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#8 |
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Snackbar Tuning
Drives: 2023 SGM ZL1 Join Date: Oct 2016
Location: Florida
Posts: 1,522
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Would need to see a log to determine the issue. It could be a few different things. Mainly calculated torque between the ECU and TCM.
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GM Gen V Calibrator
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10-07-2024, 10:10 PM
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#9 | |
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Super Stock
Drives: Chevrolet Camaro ZL1 Join Date: May 2022
Location: Concordia
Posts: 1,004
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Quote:
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2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi
758 HP/ 804 TQ  |
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10-08-2024, 01:28 AM
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#10 | |
 Drives: 2018 Camaro ZL1 A10 Join Date: Feb 2022
Location: Dubai, UAE
Posts: 90
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Quote:
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10-08-2024, 07:45 AM
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#11 | |
       
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 7,665
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Quote:
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 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |
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10-08-2024, 11:40 PM
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#12 |
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Drives: 2020 Chevy Camaro ZL1 1LE Join Date: Nov 2017
Location: Earth
Posts: 137
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How do I attach a log? Would like you guys to check and give any insight you have
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10-09-2024, 08:11 AM
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#13 |
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Snackbar Tuning
Drives: 2023 SGM ZL1 Join Date: Oct 2016
Location: Florida
Posts: 1,522
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email me and I can send you a config file for VCM scanner that will capture the relevant torque PID's.
Jason @ snackbartuning dot com To attach a log to the forum, you go to advanced mode and click attach file.
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GM Gen V Calibrator
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10-09-2024, 09:38 AM
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#14 |
Drives: 2019 ZL1 "1LE" | 16 SS | 2017 F30 Join Date: Dec 2021
Location: Europe
Posts: 132
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I had similiar issue.
The reason was, it hit the rev limiter during the shift. Mine is set now to 6800 rpm I believe. That simply happens with increased power. The shift points are triggered by speed and not by the rpm's. By increasing the rev limiter, the transmission gets again enough time to complete the upshift.
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Callaway SC750 ZL1, DIY 1LE with added OEM 1LE Wheels, DSSV Suspension and 1LE Aero, FEA front control arms, DIY oil cooler, CWA 150 pump, bigger intercooler, Phenolic blower spacer, 82°C thermostat, BMR lockout kit, CTSV Brake Air Deflectors, Smooth idle cam, LS7 lifters, Bronze trunnion bushings. Tuned by JRE
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