Launch control acting up!
Thread Starter
3rd Gear
Joined: Feb 2018
Posts: 3
Likes: 0
Launch control acting up!
2014 C7 Stingray. Base. Automatic. Stock. Tried out launch control for the first time today. Put it in track mode. Double clicked **** for launch control and stabilitrack showed off. Competitive driving mode flashing. Pressed brake firmly, put accelerator to the floor. RPM’s stabilized at 2000. Held accelerator and released brake. Engine acted like it missed. Rpm’s dropped then came back up. Almost like it bogged on itself. Then came alive and took off. Tried several times and did the same thing. Stopped trying. You could see an ever so slight black mark start then stop then start again where engine bogged. It was not operator error. What is making it do that? Should I take to the dealership? Still under warranty.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,819
From: Charlotte, NC (formerly Endicott, NY)
Sounds like it is operating correctly. The engine stutter is launch control controlling rear tire slip so you don't sit still burning your tires. If you were launching the car controlling the throttle yourself you would be lifting off the throttle to cut down on wheel spin. You don't get max acceleration if the wheels are spinning too fast. They need to spin a little not a lot. Check the Spring Mountain video below:
Bill
Bill
Pro
Joined: Oct 2016
Posts: 691
Likes: 196
From: Virginia
Working correctly
That’s exactly how it should work so there is nothing wrong with your system. It was cutting power to control your wheel slip. Change to performance or drag tires, hook and go, then you will see the “bogging down” stops. I tell my buddies all the time and it is soooo true...” you can have 1000 hp but if you cannot put it on the ground, you will lose everytime in a race”. Our cars have so much power and you are experiencing your engine is outpowering your tires. It just the system keeping everything as balanced as possible. Hope this helps buddy
Thread Starter
3rd Gear
Joined: Feb 2018
Posts: 3
Likes: 0
I’ve watched this video before and mine is not like this. Even though the car in the video is hesitating/bogging, mine seems to just flat out fall on its face then picks back up. So much so I’d be embarrassed to even try launch control with somebody else in the car. It seems almost electrical/computer or mechanical. It almost COMPLETELY loses power. It bucks the whole car getting under way. Its not even close to the smoothness of this video. Like manual says, I hold the accelerator long enough to stabilize rpm’s. Let brake up. Holding accelerator to the floor.
Last edited by Nobigdyl; Feb 3, 2018 at 10:30 PM.
Thread Starter
3rd Gear
Joined: Feb 2018
Posts: 3
Likes: 0
Yes I dumped the brakes. Did not feather it on release. But thank you for making the suggestion. Im going to take it to the dealer and let them look at it. I kind of threw this out there just to see if anybody else was or had experienced the same symptoms and what I needed to do. It’s under warranty so..might as well. Thanks
Safety Car
Joined: Aug 2012
Posts: 3,960
Likes: 1,106
I am not sure where you are located but the video you saw was shot in hot weather with hot tires. Cold (they aren't going to get up to operating temperature without some hard driving even when it is in the 80s and it probably isn't where you are) and older tires (compound has hardened) are going to make the bog worse because the more slip the more intervention from launch control.
It is doing the best it can with the traction you have available. Make sure the tires are hot, in decent shape, and on a good surface and try again.
It is doing the best it can with the traction you have available. Make sure the tires are hot, in decent shape, and on a good surface and try again.
Le Mans Master
Joined: Aug 2015
Posts: 8,243
Likes: 4,617
From: Southwest Florida
I gave up on it. The knuckleheads who programmed it could not have done a worse job. Should be simple, straightforward and work every time.
And yes, I read the manual multiple times, watch several videos and it’s still a PITA to use.
And yes, I read the manual multiple times, watch several videos and it’s still a PITA to use.
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Melting Slicks
Joined: Apr 2016
Posts: 3,169
Likes: 861
From: Naples FL
It sounds like you're wanting launch-out-of-control. Just push the center button in the mode selector once and mash the gas. You'll get a sweet smokey burnout.
Last edited by spearfish25; Feb 5, 2018 at 08:36 PM.
Racer
Joined: Feb 2017
Posts: 426
Likes: 79
From: Colorado
Ever since my SC install and tune, my launch control will not work. When I double tap the center button..it goes into the 5 modes. After I select sport 1 or any of the other modes..my TC and stability control light turn off. The car doesnt get into launch mode and it's more like I'm just holding the brake in while pushing the gas pedal.
