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2024 C8 Trans shifting - Normal?

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Old Jan 4, 2024 | 02:35 PM
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Default 2024 C8 Trans shifting - Normal?

I have 2024 C8, inly had it for 10 weeks and wanted to check if this is normal.

When I stomp on it hard, it goes like a bat out of HXXX but when I let off the gas, the transmission holds in the lower gear for a few seconds.

Is this normal?
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Old Jan 4, 2024 | 02:45 PM
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^^^
What drive Mode? Expect because you gave it full throttle it is waiting for your next aggressive drive command and is holding for you to accelerate more or after a corner. I know in Z-Mode where I often dive that is the case.
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Old Jan 4, 2024 | 02:46 PM
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My MY23 will do the same. The car anticipates "spirited driving" and will adjust shifts accordingly. Nothing to be concerned about.
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Old Jan 4, 2024 | 02:47 PM
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Originally Posted by sarnold1955
I have 2024 C8, inly had it for 10 weeks and wanted to check if this is normal.

When I stomp on it hard, it goes like a bat out of HXXX but when I let off the gas, the transmission holds in the lower gear for a few seconds.

Is this normal?
Very normal. It is anticipating you driving in an aggressive manner and therefore leaving the transmission in the lower gear.
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Old Jan 4, 2024 | 02:53 PM
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My 24 does the same.
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Old Jan 4, 2024 | 03:02 PM
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Very normal as others have said, she thinks you want to play. If it bothers you just pull the + paddle and it will shift immediately to a higher gear and settle down, otherwise it will settle down after 4 or 5 seconds.
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Old Jan 4, 2024 | 03:32 PM
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Yea normal it is a bit startling the first time however
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Old Jan 4, 2024 | 03:35 PM
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Keep your foot in it. Don't lift. Problem solved.
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Old Jan 4, 2024 | 04:43 PM
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Originally Posted by sarnold1955
I have 2024 C8, inly had it for 10 weeks and wanted to check if this is normal.

When I stomp on it hard, it goes like a bat out of HXXX but when I let off the gas, the transmission holds in the lower gear for a few seconds.

Is this normal?
Yes. I if you have downloaded a copy of your 2024 Service Manual from here:

https://www.chevrolet.com/bypass/pcf..._2023JUL11.pdf

and seach on these terms

"Driver Influenced Gear Selection", "Performance Transmission", and "Performance Shift" - it explains the features that are related to what you are experiencing, the conditions that trigger it, and how it affects the shifting and gear selection. Depending on the display theme you are using, there is even a light on the DIC that indicates when the feature is active. It is discussed in several place in the manual, which is why I suggest a search for the terms.

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Old Jan 4, 2024 | 05:23 PM
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Same here. Just so ya know. The car is annoyed that you are letting off the gas.

I will shift to the next higher gear with the paddle sometimes to bring the RPM's back down.

After 4 months, I am finally starting to realize this is a sports car. It is meant to romp and stomp.
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Old Jan 5, 2024 | 07:12 AM
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Happens with my C7 also. It is normal.
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Old Jan 5, 2024 | 07:17 AM
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Same\Normal. Mine does the same. So I just hit the shift-up button.
Makes sense to me. The car logic thinks you want to stay in aggressive drive mode and is ready to do more, continue.
I have MyMode set to sport. I now need to test in Tour Mode which I believe it will still hold the lower gear even after letting off the throttle.
TBD?

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Old Jan 5, 2024 | 07:39 AM
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When I drive in My Mode, set to Sport, I'm in traffic in town etc., it never does what the OP and most others describe. BUT when I drive in that mode I'm not driving aggressively where I use Z-Mode. It's all controlled by my right foot.

FWIW, reminds me of my wife who drives conservatively. BUT when see takes off from a stop she uses a lot of throttle. Her BMW Turbo 6 SUV is accelerating more like how my C8 does in Z-Mode Power set to Track (purposely as that is what I elect to do.) But it shifts quickly to 2nd. If she drove my C8 (in 3 1/2 years never has, never drove my 5 prior Vettes and will not want to drive my E-Ray -her choice) but expect she would find it held 1st gear too long. Wonder if that is part of the reason when I suggest driving in Z-Mode with Power/Trans set to Track folks say it holds in low gears too long. It is very right foot dependent.

A member made this video showing why he only uses Z-Mode. For those who don't like V4 it also avoids ever going into that Mode. If you have MRC, can set Ride independently wherever you like, such as Tour. If not, has no effect on ride. You'll see in most of the video he is NOT driving aggressively and car is shifting at low rpm.

Last edited by JerryU; Jan 5, 2024 at 08:26 AM.
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Old Jan 5, 2024 | 08:09 AM
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Default Driver Influenced Gear Selection is Effective In All Modes

Per the Manual, and simply put:

"Driver Influenced Gear Selection will influence both the upshift points and downshift points in all modes. When engaged the Performance Transmission Active light displays" [Note, I think that Performance Transmission Active light is only present on certain DIC display themes]........."Driver influenced changes are effective in all modes, however the aggressiveness of the transmission response will increase between Tour, Sport, and Track modes respectively."

In this context, the "modes" refers to the Driver Modes. But, it would also apply to the engine/shift setting (Tour, Sport, and Track) in Z-mode as well. That is, Z-Mode, when Performance Transmission is active, the response will increase between Tour, Sport, and Track settings of engine/shift.





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Old Jan 5, 2024 | 09:44 AM
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Perfectly normal..... as stated before the Car assumes since you stepped on it
it needs to continue the aggressive acceleration/shifts.
Easy fix ...... just paddle shift up a couple of gears.
It will lower the rpm's and switch back into Drive mode after a few seconds.

Last edited by EVL-C8; Jan 24, 2024 at 10:29 AM.
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Old Jan 24, 2024 | 10:16 AM
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Does this type of transmission function also occur in the earlier C8s? I just got a 2020 and noticed the same issue! How do I deal with this issue on my 2020? Thanks in advance!
RJ
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Old Jan 24, 2024 | 10:26 AM
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Originally Posted by RJS91RGTP
Does this type of transmission function also occur in the earlier C8s? I just got a 2020 and noticed the same issue! How do I deal with this issue on my 2020? Thanks in advance!
RJ
It isn't an issue - the car was designed to operate this way and it doesn't hurt anything. As mentioned, you can use the paddle to shift into the next gear or so if it isn't doing it as quickly as you want.
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Old Jan 24, 2024 | 11:09 AM
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Originally Posted by RJS91RGTP
Does this type of transmission function also occur in the earlier C8s? I just got a 2020 and noticed the same issue! How do I deal with this issue on my 2020? Thanks in advance!
RJ
Since my C8 Z51 did not do that when in MY Mode (set to Sport) suspect your issue has more to do with your right foot! Try using less throttle when you take off from a stop. Maybe whoever had the car before you had a heavy right foot. It may need to learn that is not how you drive?

In addition, the C8 has a very numerically high dif. Combined with the 1st gear ration torque multiplication is 15:1. Those are for my Z51 but the Base is similar. Compared to my standard shift C7 Grand Sport where combined 1st gear was 10:1. It hit redline at ~50 mph in 1st gear. The C8 hits redline in 1st at ~34 mph.

Yep that 60% rear weight allows higher torque multiplication in 1st. Feels more responsive BEAUSE IT IS!

Last edited by JerryU; Jan 24, 2024 at 11:24 AM.
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Old Jan 24, 2024 | 06:49 PM
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Thanks for the reply and info. If I am in Drive mode and not Manual using the paddles and I give it the throttle and this happens are you saying just hit the +paddle to get to a higher gear even if I started out in D mode? Sorry for the stupid question but I just got the car and am learning as I go. Input from others is the best way to get info.

Thanks

RJ
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Old Jan 24, 2024 | 06:55 PM
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Originally Posted by RJS91RGTP
Thanks for the reply and info. If I am in Drive mode and not Manual using the paddles and I give it the throttle and this happens are you saying just hit the +paddle to get to a higher gear even if I started out in D mode? Sorry for the stupid question but I just got the car and am learning as I go. Input from others is the best way to get info.

Thanks

RJ
The paddles work no matter the mode selected. .. They are also fail-safe. That is you cannot shift into a higher gear if the engine would lug, nor can you downshift to a lower gear if it cause an over rev. .. Also, be aware that once you use the paddles, the car will be in manual mode for a number of seconds. .... EXCEPT if you are headed down a steep grade. In that case if you have selected a lower gear, it will hold that gear for as long as you are driving down that hill.
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