A/S

For U.S. 991.2 GT3 owners, if you set TC and ESC OFF, hit the brake pedal, hit full gas while holding the brake pedal, do your cars have the message "Launch Control Activated" or not?

My 991.1 Turbo S does it regardless of PSM on/off, Sport/Sport+/Comfort. My 991.1 GT3 RS only activates with TC/ESC-ON, with the nannies off, it revs the engine but does not activate LC and the launch is disastrous (just a big tire burnout and horrid slow take-off).

thanks,

GrantG

Pretty sure you have to leave ESC/TC ON to initiate Launch Control on GT3/RS.

Dr.Bill

Should be in the owners manual.

Quikag

CAlexio

I haven't answered as my car is sitting in Europe for a few more weeks before I go back to try it.. and I can't remember how it worked when I did try it. Someone with a manual chime in

Todd B

For the 991.2, TC has to be left on for launch control to activate. It does not matter if PDK Sport button is on or off.

qbix

Palting

Geez. Here, strraight from the 991.2 GT3 and GT2RS manual:TC MUST be switched on, PDK does not need to be in sport mode.

Mussl Kar

This! At least for 991.1. With nannies off it makes more sweet noise but still launches hard. Maybe 10 feet of slight tire spin but it will hook up and go after that.

qbix

Palting

LOL. Alright, guess all you want and ignore the actual manual I posted that says TC must be on, otherwise LC will not activate.

Quikag

Palting

It must have something to do with German to English translation. The way I interpret it, if you intervene after launch by manually upshifting the PDK with the paddles or with the stick, the PDK will now wait for further manual input from you rather than upshift itself, while engine maintains full power (no lift) when you do shift.

Anyone else notice that the Launch control on the manual will hold the rpm at 5,000 rpm, and that the launch will be terminated for excessive clutch slip? The PDK, OTOH, holds the rpm at 6,500, with I assume no tendency for clutch slip?

GrantG

I think the reference to clutch slip with the Manual is if the driver lets go of the clutch pedal too slowly, rather than just letting it pop.

Also interesting that the Manual cars do not get a message about Launch Control being active - it just does it (someone posted about being concerned that there was no message with a Manual and I guess this confirms that there is no problem).

A/S

I tested a 2014 991.1 GT3 and that car activates launch control regardless of TC/ESC ON or OFF position.

Somewhere in 2015 Porsche eliminated the LC feature if the nannies are off in the GT3, but the 2015 Turbo S still activates LC on any PSM mode. My RS is a 2016, so it does not have LC either with the nannies off.

Unfortunately, the car is faster on a road course with the nannies off, and for time trials, hill climbs, the launch matters. I even tested deactivating the ESC after the car launches, but the button doesn't work unless you are below certain g-forces in any direction, somewhere in the 0.6-0.7g and up in any direction and the car ignores deactivating the ESC.

On a set of grippy tires and with them up to temperatures, with ESC-OFF and no LC but still using the full brakes/full gas, the RS still holds the RPM at 6500, but the brake release does not use the LC logic, the 1st gear clutch just engages fully and the car takes off quick. However, with the stock MPSC2 the car would just smoke the rear tires and lose 0.2-0.3 seconds to 40mph consistently (dozens of tests with the VBox) and another 0.1 secs to 60mph..

Bummer that LC gets disabled by defeating the nannies.

For the 991.2 Turbo, Porsche has a soft LC and a normal LC (2 LC programs), the difference on 0-60mph is 0.2-0.3 secs between the 2 modes. Cobb Tuning offers this dual mode for the 991.1 Turbo PDK tune, but they haven't done a PDK tune for the 991.1 RS or GT3 just yet.

Thanks for the feedback..