07-08-2021, 05:35 AM | #1 |
Drives: 2018 A10 ZL1 Join Date: Oct 2020
Location: Kuwait
Posts: 21
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ZL1 A10 Transmission tunning
So i have been wondering what are the gains and if its worth it or not to unlock the transmission and get it tuned, also if it has to do something with changing the wheels to aftermarket wheels because i just got myself a rear only set of 18x10.5 race stars and when i got them on the car it got weird and started to slow down by itself when ever I exceed 30 mph.
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07-08-2021, 05:47 AM | #2 | |
Drives: '18 ZL1 1LE Join Date: May 2020
Location: KY
Posts: 219
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2018 ZL1 1LE - Summit White, PDR, Rotofab CAI, 95mm TB, CSP 2" catless LT's, JMS Voltage Booster, AEM X-series WB, DSX flex fuel sensor, Banks Data Monster, Tuned by Ted Jannetty, 5% Tint, Blackvue DR900S-2CH, Diode Dynamics lighting, IGL Kenzo ceramic coating
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07-08-2021, 06:46 AM | #3 | |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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I dropped to 275/30R19 front and 295/30R19 rears on APEX ARC-8 19" wheels so a bit over 1" less overall front and rear tire height and have absolutely no shifting issues or otherwise. |
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07-08-2021, 06:50 AM | #4 |
Drives: 2018 A10 ZL1 Join Date: Oct 2020
Location: Kuwait
Posts: 21
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I have to give that a try i guess, didnt so it last time i tried them on.
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07-08-2021, 06:51 AM | #5 |
Drives: 2018 A10 ZL1 Join Date: Oct 2020
Location: Kuwait
Posts: 21
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My front is the stock wheel and stock tires, rear is 18x10.5 wheels and 305/45/18 tires
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07-08-2021, 07:06 AM | #6 | |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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Quote:
The rear tire height for a 305/45R18 tire is 28.8". You are absolutely having issues because the difference in height between the front and rear is too substantial (need to be < 1" difference and you dont want rear shorter than the fronts). Your rear is currently 2.1" taller than the front. FIX: You need a different rear tire or a taller front tire, if it will fit. The tire height for the rear (assuming you use a stock front tire size) should be between 26.7" and 27.5" to be safe and to resolve your issue. Optional sizes that will work with your OEM fronts without issues for transmission shifting if you can find a tire available in them that you want. Be sure to verify that the tire you pick will fit on the specific wheel you have in the rear based on its width and the wheel's acceptable tire width range. Also if you go to 315/325's etc, be sure that the tire wont interfere with the rear suspension etc: - 275/40R18 - 285/40R18 - 295/40R18 - 305/40R18 (27.6" tall, i would not suggest going this big, leave a buffer) - 315/35R18 - 325/35R18 Note, as you increase tire diameter, you effectively change the gearing of the car. You will have less torque multiplication delivered to the rear by the taller tires (although more traction based on tire type potentially and softer sidewalls). Shorter tire heights amplify torque multiplication as if you changed gear ratios, while also lowering top speed. Typically folks will use a 17" rear (fits with OEM brakes) with a 17x10 or 17x10.5 rear drag radial if you are dragging the car. Use this website: https://tiresize.com/height-calculator/ to do a quick check on tire height per tire, or check the specific tire for the most accuracy on Tire Rack in the tire specs. |
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07-10-2021, 12:16 PM | #7 |
Drives: 2018 A10 ZL1 Join Date: Oct 2020
Location: Kuwait
Posts: 21
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Oh, i tried the comparison and yeah the difference was 1.3” could that be the problem? And do you have an idea if i need to tune the transmission or not to change the rear wheels? I am talking if i fixed the 1.3” difference issue.
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07-10-2021, 01:43 PM | #8 | |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,592
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Quote:
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'20 ZL1 1LE A10.
LME 390, E2650, FBO, 100 oct. Not a DD. |
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07-10-2021, 10:59 PM | #9 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,696
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Have I missed something, when did tuning the T93 become possible? Or did you mean a T87A swap (in which case pre-2019 TCM tune gains would apply, I presume)?
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
07-10-2021, 11:19 PM | #10 |
Drives: 2020 Camaro ZL1 Join Date: Oct 2020
Location: Fort Worth, Texas
Posts: 1,174
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What exactly would the difference in feel be for an A10 tune?
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2020 ZL1 A10 Shadow Gray Metallic
Magnuson Magnum DI TVS2650R| Mamo Throttle Body V2| RotoFab Intake| AWE Touring Catback Exhaust| TCM Tune| Tune| Eibach Pro| BMR Rear Cradle Lockout| PPF| Ceramic| BCForged HCS21 |
07-11-2021, 12:18 AM | #11 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,696
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Honestly, I have no idea, because I don't have an exhaustive list of differences between the T87A and the T93. Without that everything is just conjecture
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
07-11-2021, 07:40 AM | #12 |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,592
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HHP now sells the editable T87A. They will tune it or your tuner can, which means all those wonderful edits discussed here are in play (you will need HPTuner's credits)
It’s going to come with a base calibration same as all the other unlocked T87A’s for 10 speeds that HP Tuners does.
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'20 ZL1 1LE A10.
LME 390, E2650, FBO, 100 oct. Not a DD. Last edited by JSH; 07-11-2021 at 12:03 PM. |
07-11-2021, 09:49 AM | #13 | |
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,534
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Quote:
It's not a T93. It's a T87a unlocked and modified to work on 2020+ cars.
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928rwhp - 93 | 1040rwhp/898rwrq - E65 SAE
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07-11-2021, 11:09 AM | #14 | |
Drives: 2017 Camaro SS, 2011 Corvette GS Join Date: Feb 2019
Location: Erlanger, Kentucky 41018
Posts: 820
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