BlueDevilZ51

So I've been reading the manual and doing a lot of searches on the forum looking into competitive mode settings. This question is in reference to a 2015 Z51 A8 WITHOUT mag ride. So my car has competitive mode in track and it does not have the 5 sub modes of PTM.
I'm interested in using the launch control in track mode.. I understand after selecting track I push the center button twice and this enables "Competitive Mode" .. Then I push firmly on the brake paddle with my left foot and then quickly and fully on the throttle with my right foot. If I'm correct to this point the Rpms will hold around 4k. Then I quickly release the brake and "Launch"..
So I think I'm good to this point still have to try it out. When I was reading the manual I saw with a mag ride car with PTM you could still have stabilatrack enabled in some PTM modes. Being my Z51 doesn't have mag ride/PTM after going to Track mode. Then pushing the center button twice, competitive is enabled but it also shows in the display that both traction control as well as stability are turned off. I was wondering if there is a way to enable launch control but keep stability on??
If not I guess I could just hit the center button once after launch to turn the stability back on??

BlueDevilZ51

Bump... Maybe I should have posted this question in the Tech/Performance section

GTB/ZR-1

Launch control only applies to cars w/ 3-pedals in the C7 world... ;-)

Just click the button once (to turn off TC, but leave Stabilitrack on), power-brake your car, and your off!

BlueDevilZ51

I know I could stage the car in the way you said but C7 autos also have Launch Control

pickleseimer

Launch control was demonstrated to our class at Spring Mountain both is an auto and a 7-speed. The demo was done by one of the instructors with the class standing outside the car. The primary difference I saw was that the auto car was holding the engine RPM at about 2000 RPM right before launch whereas the manual car settled in at about 4000 RPM after a brief rev flare.

I was wondering if the auto car's RPM being held at 2000 was more a function of the converter stall speed rather than being managed by the launch control software. I didn't ask (mine is a manual) nor did anyone else.

GTB/ZR-1

My bad! lol

11B250

it's the limitation of the torque converter. it would be horrible to have a 4000 stall torque converter.

I will tell you that it's not always 4000 RPMs in the manual. I'm not sure how it gets there, but if you let it rev there for a few secs, it will peak to 4000, then drop slightly to something else between 3500-4000. at least mine does. I see on videos people release the clutch as soon as it hits 4000 RPMs. I let the RPMs settle before I launch.

pickleseimer

Yeah. I've built several street rods and one had a race converter that was pretty much annoying when on the street.

With today's electronic lockup converters, I think you could have the best of both worlds. I don't know what the Vettes do in this regard as I don't have an auto so the details on this are not on my radar.

At the Spring Mountain demo it looked like the automatic car launched a little softer than the clutch car with not much detectable wheel spin. On the other hand, the manual car put some rubber on the track with the system modulating wheel spin, allowing a little slip to keep the power up but then grabbing some traction, this cycle repeating itself through the launch. Tire marks on the pavement showed this on/off pattern over the length of the launch. That car took off like a scalded cat.

BlueDevilZ51

So is there a way for me to keep stability control on while using launch control?

cberistain

Do you remember the procedure for setting up launch control on the automatic?

pickleseimer

I took a video of the demo - the sound quality is marginal as it was VERY windy at the time. Rick Malone was narrating the demo, and from what I hear of his explanation in the video, one sets it up like this:

1) Select Track mode
2) Enter Competitive Mode or if a PTM car, select one of the 5 PTM modes.
3) Vehicle must be stopped, in gear.
4) Steering wheel straight ahead.
5) Put your left foot HARD on the brake.
6) Put the accelerator to the floor briskly.
7) Release the brake pedal while staying fully on the throttle.

cberistain

thanks .... I'll give it a try.
charlie

BlueDevilZ51

Yes, no, maybe?