I've read about it, and it seems you have to go into special modes for it.

but i'm pretty sure i exectued it the other day in regular touring, sport, and track mode.


simply hold the brake down very hard, hit the throttle, to which the car stays at 2k, then lift the brake? is this correct? Also, my other question is, is the rpm adjustable, to make it go higher than 2k?

 

'sNo, you can't change the rpms and you have to go into one of the PTM's to get the real launch control. Put it in Track and hit the TC button twice. Then you can keep the wheel straight, floor the throttle then release the brake pedal to launch. There are quite a few you tube video's on it.

 

ok, so what am i doing exactly if that isn't the real LC? lol thanks for the reply!

 

Mainly because the OM tells you it isn't available in Weather, Eco, Touring or Sport. You have to be in Competitive Handling Mode or in one of the Track Modes. From the 2015 OM:
Launch Control (Track Mode Only)
A Launch Control feature is available, within Competitive Driving Mode (except Z51 and Z06 with Magnetic Ride Control) or Performance Traction Management (Z51 and Z06 with Magnetic Ride Control), on all vehicles to allow the driver to achieve high levels of vehicle acceleration in a straight line. Launch Control is a form of traction control that manages tire spin while launching the vehicle.This feature is intended for use during closed course race events where consistent zero to 60 and quarter mile times are desirable.Launch Control is only available when the following criteria are met: Competitive Driving Mode is selected (except Z51 and Z06 with Magnetic Ride Control) or any of the Performance Traction Management modes are selected (Z51 and Z06 with Magnetic Ride Control). The TCS light comes on the instrument panel and the appropriate DIC message displays. The vehicle is not moving. The steering wheel is pointing straight.

Manual Transmissions
The clutch is pressed and the vehicle is in 1 (First) gear. . The accelerator pedal is rapidly applied to wide open throttle. The Launch Control feature will initially limit engine speed as the driver rapidly applies the accelerator pedal to wide open throttle. Allow the engine rpm to stabilize. A smooth, quick release of the clutch, while maintaining the fully pressed accelerator pedal, will manage wheel slip. Complete shifts as described in Manual Transmission on page 9-31.

Automatic Transmissions
The brake pedal must be firmly pressed to the floor, equivalent to a panic brake event. The accelerator pedal is rapidly applied to wide open throttle. (If the vehicle rolls due to wide open throttle, release the throttle, press the brake pedal more firmly, and re-apply theaccelerator to wide open throttle.) The Launch Control feature will initially limit engine speed as the driver rapidly applies the accelerator pedal to wide open throttle. Allow the engine rpm to stabilize. A smooth, quick release of the brake pedal, while maintaining the fully pressed accelerator pedal, will manage wheel slip. After the vehicle is launched, the system continues in Competitive Driving Mode (except Z51 and Z06 with Magnetic Ride Control) or Performance Traction Management (Z51 and Z06 with Magnetic Ride Control). Competitive Driving Mode, PTM, and Launch Control are systems designed for a closed course race track and not intended for use on public roads. The systems are not intended to compensate for lack of driver experience or familiarity with the race track.

Bill

 

Two important things the OM/Bill pointed out. Press the accelerator wide open (to the floor) quickly & DO NOT let up on gas till you've done your 0-60. As others have said too, practice this in an empty BIG parking lot or traffic free 3 lane road, with your car in the center turn lane to give yourself plenty of room IF things go sideways, literally! Have fun, be safe.

 

Guess I should have read it before posting.Lol It does sound funny that way. Lol

 

Slightly off topic but regarding launch control, in most videos I've seen it looks like people will get slight wheel spin and then slingshot out the hole. With mine, I just sit there and do massive burnouts before it finally gets going or I get so sideways I have to pull out of the run. I've tried wet, dry, various "sport" settings within PTM and all just spin like crazy (some more/less than others). Tires are warm but road conditions are a big variable of course. I thought the launch control program would sense wheel spin and more or less feed just enough throttle to prevent just doing a burnout?

 

You must mash the pedal all the way to the floor super-quickly, and hold it there, otherwise you will not be in launch control.

 

Got it, that's not the problem. It'll hold 2K fine with brake and gas mashed in various PTM modes. The problem is when I step off the brake, it just lights up the tires.

 

Anyone with an M7 use launch control without bogging when releasing the clutch? Either I am not slipping enough or I need more RPM. Either way, it is likely something I am doing that is making it bog. I think I am more or less dropping the clutch as opposed to slipping it. It is fun though!

 

I'm out of ideas then, Bud. Mine doesn't do that.

 

I'll try to remember to post a PDR recording of it. I wonder if the stock launch control program maybe doesn't know how to compensate for modified cars? I.e. making more power than the software expects and rather than sensing the wheel spin it's going more off preprogramed torque or throttle input limits...if that makes sense?

 

 

Well now, I think we may be on to something!

 

The EBCM detects the wheel spin and tells the ECM to modify torque to control how much torque is delivered to the rear wheels. From the EBCM standpoint it is only comparing front wheel speed to rear wheel speed and doesn't need to know anything about the engine power level. Now if a tuner has gone into the ECM and modified the tables related to torque control so the engine doesn't respond the same the wheels may spin too much.

Bill

 

when u actually "engage" the LC, do you get any message saying you are ready?

 

I don't think so. You are in one of the 5 sub modes of Track Mode and when you jam the throttle to the floor followed by releasing the clutch or brake pedal it goes. Anything less than full throttle gets you something similar on initial take off as PTM seems to do something to keep wheel spin to a minimum. I was in an autocross two years ago where the start was on a down hill slope. I had to hold the car with the brake while my foot was on the clutch and when I got the green flag I would move to the throttle and bring the rpms up to about 2K and start letting out the clutch before the car rolled too much. As the car started moving I released the clutch all the way and rolled heavily onto the throttle and the car would stutter away (tires alternately slipping grabbing) from the starting line just like the ones demonstrating launch control do.

Bill

 

Hi Bill - Please excuse my confusion. I just bought my 2015 ZO6 which does have MRC. Does this mean I do not have launch control or must I be in Track mode to acctivate it. Thanks for the clarification.

Chuck

 

Sorry to get slightly off topic again but coincidentally enough, I just returned from the shop for some tweaks to my current tune. The 17+ models have additional tables that previous models didn't have and they were initially missed. This caused the car to go into limp/limited performance mode due to "overboost" when I took the car to lower elevations (I'm tuned at and operate between 5500-8500' and told them to keep the tune conservative). There was a separate code thrown for throttle modulation (103mm TB) that was also related to the additional tables they initially missed. Anyway, long story short they want me to try the launch control again after they've tweaked some things and see if it behaves as it should now. Odds are pretty good it was/is tune related though in my end.

 

The manual says you only have it in Track Mode:
A Launch Control feature is available, within Competitive Driving Mode (except Z51 and Z06 with Magnetic Ride Control) or Performance Traction Management (Z51 and Z06 with Magnetic Ride Control), on all vehicles to allow the driver to achieve high levels of vehicle acceleration in a straight line.

Basically, Stingrays and Z51s without MRC have Competitive Driving Mode. With these cars you turn the **** until Track is displayed and push the center button twice to get into Competitive Driving Mode. Launch Control is available from this position.

Z51s with MRC and Z06s have Performance Traction Management. With these cars you turn the **** until Track is displayed and push the center button twice to get into the PTM menus. Then you have Launch Control in any of the sub menus. It probably doesn't make sense using it in Wet or Dry. Sport 1 would be like the regular car's Competitive Driving Mode since it has no TC and a competitive handling version of stability control. Sport 2 has no TC or Stability Control while Race has no throttle dampening on throttle movements.

Bill