Agree
V4 mode
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,106
Likes: 12,446
From: NE South Carolina
Yes BUT like the M7 you can use the DCT "M" mode to avoid it.
This summary of the C8 Transmission operation includes comments from GM’s DCT Controls Manager and a C8 form post by Tadge. Pretty impressive options.
This summary of the C8 Transmission operation includes comments from GM’s DCT Controls Manager and a C8 form post by Tadge. Pretty impressive options.
- The C8 DCT transmission has different automatic shift strategies for the various drive modes, which adapt in real time. The more aggressive, the more spirited you drive, the more aggressive the car's responds, -start to relax, the car starts to relax.
- The DCT uses latitudinal and longitudinal accelerometers, and looks at information like throttle position and steering angle to gauge how the car is being driven, and react accordingly. In Track mode set to automatic, the car will downshift aggressively when the driver is braking hard into a corner, and hold upshifts until corner exit.
- The C8 has two manual modes. If you pull a paddle while in Drive, you get a temporary manual mode, which automatically times out, or can be exited sooner by holding the upshift paddle. In this mode, the car will automatically upshift at redline. If you press the M button in the center console, you get full manual mode. There's no time out, and the car won't upshift at redline.
- Hold the downshift paddle, the DCT will serve up the lowest possible gear. Do that while braking, and the transmission will keep downshifting as engine speed allows.
- Pulling both paddles at the same time is equivalent to pushing in the clutch pedal on a manual car, which allows you to rev the C8's new V-8 as much as you want.
- The paddles are directly wired to the transmission control module (TCM) for quicker response times. This doesn't mean the paddles will give you a downshift that over-revs the engine—the TCM prevents that.
- With the C8's Performance Launch mode, the car uses the inertia of the engine coming down between revs to propel the car forward.
- You can avoid V4 mode using the “M” manual button or temporally for 5 seconds after pulling the last shift paddle. The new "Z" mode comes from the factory set up as an extra sporty mode including shift schedules pulled from the "Track" mode, so that will be V8 only. You can customize "Z" mode any way you want, so if you elect another shift pattern, V4 mode will return.
Last edited by JerryU; Feb 26, 2020 at 12:06 PM.
Team Owner
Joined: Feb 2013
Posts: 22,598
Likes: 14,557
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Thread Starter
Intermediate
Joined: May 2008
Posts: 25
Likes: 3
From: La Quinta California
Thanks for all the info, I think I would use the z mode to ensure not going into v4. With that being said, no reason to buy the disabler for my c7 since I will only have it for another year or so
Advanced
Joined: Dec 2013
Posts: 90
Likes: 60
Actually I was going to go that route on my17GS. Less than 500 miles on the tires and yess, I could get a set of A/S tires for around 1600 before mounted and balance, but I found out the Summer Only tires may be great for the Track but ain’t worth Zilch for a trade, even with basically NEW w/ no miles on them.
Racer
Joined: Jul 2013
Posts: 359
Likes: 89
From: Jacksonville Florida
I don’t understand the problem. I have had 14 z51 and 17 GS. Unless actually on track or doing performance runs I usually had car in E and allowed V4, but had exhaust always on loud. If you are on highway running 70 and car goes to V4 and saves gas what’s the problem?
whenever you are in V4 and hit the gas it is full power 8 cylinders !
whenever you are in V4 and hit the gas it is full power 8 cylinders !
