DCT shifting pattern
Thread Starter
Le Mans Master
Joined: Jul 2010
Posts: 6,577
Likes: 2,637
From: Lancaster, PA
DCT shifting pattern
Let's say you're cruising 70 mph in 8th gear and all of the sudden you floor the accelerator while the transmission is in automatic mode. Does the DCT shift down to 3rd gear immediately? (Haven't driven a C8 yet, couldn't find an answer in search).
Safety Car
Joined: Mar 2014
Posts: 4,482
Likes: 668
From: Kilmarnock Va
I imagine it will go down a few gears, What I don’t like if you have it in manual mode is that you have to flip it each time to go down a gear,
Would have liked to skip flips with the flipper but I guess I’m asking way to much
Would have liked to skip flips with the flipper but I guess I’m asking way to much
Drifting
Joined: Mar 2020
Posts: 1,568
Likes: 1,022
From: 31 hours East of Peoria, AZ
On page 201 of the 2021 owner's manual it says:
To cause the transmission to downshift to the lowest gear possible for the vehicle speed, in Manual Paddle Shift or Temporary Manual Paddle Shift mode:
Pull and briefly hold the paddle. If the paddle continues to be held as the vehicle slows, downshifts will continue as vehicle speed allows.
The Manual Paddle Shift system will not allow an upshift or a downshift if vehicle speed is too fast or too slow, nor will it allow a start from any gear other than 1 (First) gear.
In the end, I believe that the Automatic mode reacts faster.
Last edited by JVi; Aug 1, 2021 at 08:51 AM.
Melting Slicks
Joined: Nov 2012
Posts: 3,161
Likes: 686
From: SUFFIELD CONNECTICUT
Most likely not, especially in a Z51 car. You will be close to the max mph in 3rd gear, and as you floor the throttle at 70, the car will start to accelerate before getting into the the lowest possible gear and instantly you will be too close to max speed in third gear approx 83 in a z51 versus 88 in a non Z51 car. You should be able to manually bring it down to 3rd at 70 mph or just pull the left paddle and hold it for a second it should drop right into 3rd gear from 70MPH.
Thread Starter
Le Mans Master
Joined: Jul 2010
Posts: 6,577
Likes: 2,637
From: Lancaster, PA
Most likely not, especially in a Z51 car. You will be close to the max mph in 3rd gear, and as you floor the throttle at 70, the car will start to accelerate before getting into the the lowest possible gear and instantly you will be too close to max speed in third gear approx 83 in a z51 versus 88 in a non Z51 car. You should be able to manually bring it down to 3rd at 70 mph or just pull the left paddle and hold it for a second it should drop right into 3rd gear from 70MPH.
Melting Slicks
Joined: Nov 2012
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From: SUFFIELD CONNECTICUT
Instructor
Joined: Feb 2021
Posts: 214
Likes: 90
From: Maryland
It’s best to drive I’m track mode no paddles at all and study the learned shift points . Then you can work on paddling with proper rpm locations which comes with a plethora of good things. Like safety and dct longevity.
Melting Slicks
Joined: Nov 2012
Posts: 3,161
Likes: 686
From: SUFFIELD CONNECTICUT
Does the DCT really learn shift pattern in track mode? like upshifting sooner etc for every day street driving? I tried track mode but only for a minute or two on a few occasions, its just too aggressive and holds each gear at a way to high rpm for normal street use.
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Thread Starter
Le Mans Master
Joined: Jul 2010
Posts: 6,577
Likes: 2,637
From: Lancaster, PA
I'm surprised no one has experienced this:
cruising 70 mph in 8th gear and all of the sudden you floor the accelerator while the transmission is in automatic mode (track mode or any other mode). What gear the DCT shifts into?
cruising 70 mph in 8th gear and all of the sudden you floor the accelerator while the transmission is in automatic mode (track mode or any other mode). What gear the DCT shifts into?
Racer
Joined: May 2019
Posts: 369
Likes: 294
From: Pacific Northwest
Track mode is designed to be used on a track. In D / track mode the transmission wants to shift at about 5500 to 6000 rpm and at WOT. If you want civilized behavior use Sport or Tour (My Mode is just Tour mode. Sport is just tour mode with different shift points.) If you want to drive in track mode and control the shift points drive in M.
Melting Slicks
Joined: Nov 2012
Posts: 3,161
Likes: 686
From: SUFFIELD CONNECTICUT
Track mode is designed to be used on a track. In D / track mode the transmission wants to shift at about 5500 to 6000 rpm and at WOT. If you want civilized behavior use Sport or Tour (My Mode is just Tour mode. Sport is just tour mode with different shift points.) If you want to drive in track mode and control the shift points drive in M.
Racer
Joined: May 2019
Posts: 369
Likes: 294
From: Pacific Northwest
Thank You, My main objective is to stay out of V4 mode, but there really is not a easy way. Driving in track mode or manual mode doesnt cut it. I am tempted to try a ranger that is used on the Camaro's. I understand tuners have limited access to the ecm, is there any access to the V4 mode tables??
Melting Slicks
Joined: Nov 2012
Posts: 3,161
Likes: 686
From: SUFFIELD CONNECTICUT
I usually drive in M unless I am in Z-Mode, which I have set to track for engine/transmission. That works for me, but if you want to drive in D and not in track, and not in V4 then you are in an operational regime that the car was not designed for. Tuners don't have access to the PCM at this time as I understand it, but I think that may be evolving.
Racer
Joined: May 2019
Posts: 369
Likes: 294
From: Pacific Northwest
Melting Slicks
Joined: Nov 2012
Posts: 3,161
Likes: 686
From: SUFFIELD CONNECTICUT
Racer
Joined: May 2019
Posts: 369
Likes: 294
From: Pacific Northwest
Here's an article from today's general discussion on tuner access.
https://www.corvetteforum.com/forums...-c8-s-ecu.html
https://www.corvetteforum.com/forums...-c8-s-ecu.html
Le Mans Master
Joined: Jul 2000
Posts: 6,559
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From: North Dallas 40 TX
Certainly an interesting question.
Le Mans Master
Joined: Jul 2000
Posts: 6,559
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From: North Dallas 40 TX
OK, today I was in touring mode at 60 in 8th, and I floored it. It dropped directly to 3rd. AT 58? in 7th, it dropped to 4th, then quickly shifted to 3rd.
So it appears it drops to to the lowest gear that is on the other shaft, then goes back to original gearset at an even lower gear. This makes since as it is the fast way to execute the shift. It certainly shifts faster from 7th to 4th to 3rd than I could shift from 7th to 3rd in a manual.
I have not tried in manual mode and holding the downshift lever to see how low and quick that would occur. Maybe someone else can try it.
So it appears it drops to to the lowest gear that is on the other shaft, then goes back to original gearset at an even lower gear. This makes since as it is the fast way to execute the shift. It certainly shifts faster from 7th to 4th to 3rd than I could shift from 7th to 3rd in a manual.
I have not tried in manual mode and holding the downshift lever to see how low and quick that would occur. Maybe someone else can try it.
Safety Car
Joined: Nov 2007
Posts: 3,882
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From: N.E. Suburb MN
Track mode is designed to be used on a track. In D / track mode the transmission wants to shift at about 5500 to 6000 rpm and at WOT. If you want civilized behavior use Sport or Tour (My Mode is just Tour mode. Sport is just tour mode with different shift points.) If you want to drive in track mode and control the shift points drive in M.