A10 Short Shifting on Track

Slurpee · 07-06-2023, 12:04 PM

2020 ZL1 (not a 1LE)

I was on the track this past weekend and have some strange behavior that I haven't encountered before. I got the transmission drained and filled at the dealer prior to the event.

The A10 appeared to be short shifting, and not sure what could be the cause. At WOT it would upshift early before redline.
In braking zones it would exit performance shifting mode and enter performance shifting mode causing weird shifts.
If I put it in manual mode, it would upshift early without me touching the paddles. I didn't have problems until the car got hot. First couple laps there would be no issues. I'm combing through my PDR footage to find examples to upload the problem.
It was hot, 86-87F. I was running 93 octane.
Transmission temperature never peaked past 235F
Oil temperature never peaked past 293F. It almost appeared the trans was short shifting to prevent the oil temperature from exceeding 293. I will check the trans fluid level to see if it's overfilled. I told the dealer prior to fill that I am tracking the car. Not sure if it's knock related or not. High performance manual does say to use 100 octane when it's 86F, but I was right at that cut off. Wondering if other's had this problem. Service advisor I worked with is out to speak to about the problem

ShockingZ · 07-06-2023, 12:08 PM

Are you tuned?

Slurpee · 07-06-2023, 12:49 PM

Quote:

Originally Posted by ShockingZ

Are you tuned?

No. Stock power train besides CAI

Vigilante375 · 07-06-2023, 02:25 PM

I've ran my car in 90F weather or warmer and hadn't ran into an issue where it would exit and enter performance shift mode while on track going all out. Now, if I was caught in some slower traffic or going around slow for a yellow flag then it would.

Were you in any PTM mode?

Twizzty · 07-06-2023, 03:00 PM

I ran into the exact same failsafe with my A10(Mustang PP1) at Daytona on a hot day, even in manual mode it would start short shifting itself once oil temps got high.(285 or 290ish) I could get 2-3 laps of full rpm but then it would just start shifting for me at about 4k rpm, was super frustrated and bought my M6 1LE the next month. The only time I miss the A10 is on track...blipping off shifts like an F1 driver was really fun I must admit!

*mlee* · 07-06-2023, 03:30 PM

Quote:

Originally Posted by Twizzty

I ran into the exact same failsafe with my A10(Mustang PP1) at Daytona on a hot day, even in manual mode it would start short shifting itself once oil temps got high.(285 or 290ish) I could get 2-3 laps of full rpm but then it would just start shifting for me at about 4k rpm, was super frustrated and bought my M6 1LE the next month. The only time I miss the A10 is on track...blipping off shifts like an F1 driver was really fun I must admit!

Mustang and Camaro SS have a 10L80 and the ZL1 has a 10L90 that can take a lt more abuse before any fail-safe kicks in

Slurpee · 07-06-2023, 06:11 PM

Quote:

Originally Posted by Vigilante375

I've ran my car in 90F weather or warmer and hadn't ran into an issue where it would exit and enter performance shift mode while on track going all out. Now, if I was caught in some slower traffic or going around slow for a yellow flag then it would.

Were you in any PTM mode?

I was in PTM race. I was in a lot of traffic most of the weekend, but once I noticed it shifting weird I put it in manual. With it shifting without me touching the paddles would result in me double shifting.

Slurpee · 07-06-2023, 06:12 PM

Quote:

Originally Posted by Twizzty

I ran into the exact same failsafe with my A10(Mustang PP1) at Daytona on a hot day, even in manual mode it would start short shifting itself once oil temps got high.(285 or 290ish) I could get 2-3 laps of full rpm but then it would just start shifting for me at about 4k rpm, was super frustrated and bought my M6 1LE the next month. The only time I miss the A10 is on track...blipping off shifts like an F1 driver was really fun I must admit!

It wouldn’t short shift that bad for me. About 6k RPM

Twizzty · 07-06-2023, 07:29 PM

Quote:

Originally Posted by mlee

Mustang and Camaro SS have a 10L80 and the ZL1 has a 10L90 that can take a lt more abuse before any fail-safe kicks in

I read that they were different but found it interesting they both will shift for you in manual mode to protect themselves.

Twizzty · 07-06-2023, 07:37 PM

Quote:

Originally Posted by Slurpee

It wouldn’t short shift that bad for me. About 6k RPM

That's not bad but the double shift would irritate me for sure.

Vigilante375 · 07-06-2023, 08:20 PM

Quote:

Originally Posted by Slurpee

I was in PTM race. I was in a lot of traffic most of the weekend, but once I noticed it shifting weird I put it in manual. With it shifting without me touching the paddles would result in me double shifting.

I would surely take it back to the dealer to ensure it's not over filled as that can cause it to act weird.

I really wish GM hadn't made it like this to change the fluid and not have a dip stick to check the level.

Zl1+911 · 07-06-2023, 08:33 PM

How many hours of track time in the fluids? I would start with a trany fluid flush at dealer..

cdb95z28 · 07-06-2023, 08:40 PM

I agree with those who have mentioned trans fluid level

Slurpee · 07-06-2023, 09:33 PM

Quote:

Originally Posted by Twizzty

That's not bad but the double shift would irritate me for sure.

Yup, it was very irritating. Left it in auto after that.

07-06-2023, 12:04 PM	#1
Slurpee Drives: 2020 ZL1 A10; Shadow Gray Metallic Join Date: Sep 2020 Location: Chicago Posts: 178	A10 Short Shifting on Track 2020 ZL1 (not a 1LE) I was on the track this past weekend and have some strange behavior that I haven't encountered before. I got the transmission drained and filled at the dealer prior to the event. The A10 appeared to be short shifting, and not sure what could be the cause. At WOT it would upshift early before redline. In braking zones it would exit performance shifting mode and enter performance shifting mode causing weird shifts. If I put it in manual mode, it would upshift early without me touching the paddles. I didn't have problems until the car got hot. First couple laps there would be no issues. I'm combing through my PDR footage to find examples to upload the problem. It was hot, 86-87F. I was running 93 octane. Transmission temperature never peaked past 235F Oil temperature never peaked past 293F. It almost appeared the trans was short shifting to prevent the oil temperature from exceeding 293. I will check the trans fluid level to see if it's overfilled. I told the dealer prior to fill that I am tracking the car. Not sure if it's knock related or not. High performance manual does say to use 100 octane when it's 86F, but I was right at that cut off. Wondering if other's had this problem. Service advisor I worked with is out to speak to about the problem __________________

07-06-2023, 03:00 PM	#5
Twizzty $$$$...$$...$$$...$$$$... Drives: 2021 Camaro 1SS 1LE Join Date: Jun 2019 Location: CFL Posts: 107 View My Garage	I ran into the exact same failsafe with my A10(Mustang PP1) at Daytona on a hot day, even in manual mode it would start short shifting itself once oil temps got high.(285 or 290ish) I could get 2-3 laps of full rpm but then it would just start shifting for me at about 4k rpm, was super frustrated and bought my M6 1LE the next month. The only time I miss the A10 is on track...blipping off shifts like an F1 driver was really fun I must admit! __________________ 2016 Focus RS MT - Sold 2018 Mustang GT A10 - Sold 2021 Camaro 1SS 1LE MT 2021 CX-50 Meridian Turbo

07-06-2023, 08:40 PM	#13
cdb95z28 Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008 Location: Johnstown, PA Posts: 3,234	I agree with those who have mentioned trans fluid level __________________ 2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD

07-06-2023, 12:08 PM	#2
ShockingZ Account Suspended Drives: Chevy Camaro ZL1 Join Date: Feb 2023 Location: Floriduh Posts: 121	Are you tuned?

07-06-2023, 02:25 PM	#4
Vigilante375 Drives: 2018 Camaro ZL1 Join Date: Aug 2018 Location: Georgia Posts: 1,374	I've ran my car in 90F weather or warmer and hadn't ran into an issue where it would exit and enter performance shift mode while on track going all out. Now, if I was caught in some slower traffic or going around slow for a yellow flag then it would. Were you in any PTM mode?

07-06-2023, 08:33 PM	#12
Zl1+911 Drives: 997 GTS, ZL1 A10, ZLEM6, ZLEA10 Join Date: Dec 2017 Location: NYC/NJ Posts: 630	How many hours of track time in the fluids? I would start with a trany fluid flush at dealer..

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