Launch control technique
03-22-2017, 02:00 AM
#17
Burning Brakes
Thread Starter
Just tried it with PSM off. Much better! Think the problem before must have been TC kicking in at high revs (don't remember the light coming on but then again I was watching the road!)
Only had space for one cheeky one tonight but will try to gather those data on my next long drive.
Thanks!
Only had space for one cheeky one tonight but will try to gather those data on my next long drive.
Thanks!
03-22-2017, 10:52 AM
#18
Three Wheelin'
We do launch control everyday all day long.
You need sport chrono option, and must be in sport plus.
Launch Control will not work properly with PSM off. It will just spin your tires with out PSM(TC).
Have fun!
You need sport chrono option, and must be in sport plus.
Launch Control will not work properly with PSM off. It will just spin your tires with out PSM(TC).
Have fun!
03-22-2017, 04:47 PM
#19
Burning Brakes
Thread Starter
How interesting. The opposite of my (brief) experience. Will have to do some more experimentation. What a shame!
03-22-2017, 07:00 PM
#22
Rennlist Member
Launch Control is part of the SC package. You can mash the brake and accellerator and let your foot off the brake and go, but to get the computer controlled launch, you need SC.
03-22-2017, 07:43 PM
#25
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Yes, I can read my manual.
The question is how does Porsche get the acceleration figures that they post in the manual ?
Answer: while the numbers are conservative....they probably do the same thing to both cars.
Since I have actually done it in my base 991.2 with NO sport chrono....I don't believe what anybody else says. I did not see nor did I look for any light on dash of message "Launch Control".
With so much weight on the back of the car, without PSM there might be a touch more wiggle when launching from a stop using the method of holding brake, mashing gas and then releasing brake.
Do the same thing in a Sport Chrono car and also
Do the same thing in a non sport chrono car......just put the non sport chrono in sport
And turn off PSM.
All I know is that the car revs to whatever limit it has, and most probably the sport chrono car revs higher........but when letting go of the brake the car takes off like a rocket.
Try the same method.....both cars PDK
1) sport chrono
2) non sport chrono
I say other than possibly and probably letting the sport chrono car rev a little higher that there is no difference.
Fictional discussion at Porsche headquarters.....
"Helmut ! You idiot ! You know you are not supposed to let potential customers sample both Sport Chrono and Non Sport Chrono back to back !
They will then realize it's an over priced option with minimal difference !
Your FIRED !"
The question is how does Porsche get the acceleration figures that they post in the manual ?
Answer: while the numbers are conservative....they probably do the same thing to both cars.
Since I have actually done it in my base 991.2 with NO sport chrono....I don't believe what anybody else says. I did not see nor did I look for any light on dash of message "Launch Control".
With so much weight on the back of the car, without PSM there might be a touch more wiggle when launching from a stop using the method of holding brake, mashing gas and then releasing brake.
Do the same thing in a Sport Chrono car and also
Do the same thing in a non sport chrono car......just put the non sport chrono in sport
And turn off PSM.
All I know is that the car revs to whatever limit it has, and most probably the sport chrono car revs higher........but when letting go of the brake the car takes off like a rocket.
Try the same method.....both cars PDK
1) sport chrono
2) non sport chrono
I say other than possibly and probably letting the sport chrono car rev a little higher that there is no difference.
Fictional discussion at Porsche headquarters.....
"Helmut ! You idiot ! You know you are not supposed to let potential customers sample both Sport Chrono and Non Sport Chrono back to back !
They will then realize it's an over priced option with minimal difference !
Your FIRED !"
03-22-2017, 08:05 PM
#28
Burning Brakes
Sounds to me like you can do some sort of manual launch control in any car, but the computer controlled launch control feature only with sport chrono and PDK.
Seems like the official launch control feature limits how high the revs go when you floor the accelerator and it is well below redline.
Seems like the official launch control feature limits how high the revs go when you floor the accelerator and it is well below redline.
03-22-2017, 08:27 PM
#29
LehmanZ06 what you're describing is just launching any car from a standing start. This is not what sport crono launch control is. What you're doing is feathering the gas pedal then flooring it and at the same time letting go of the brake pedal. What you're also doing is hitting the rev limiter that is built into pdk. It'll misfire at redline so you don't over rev the engine. That is not the same as SC launch control.
Launch control doesn't even get to redline. It's like the old MSD launch control modules drag racers used. It misfires at whatever RPM you choose as you floor it, you don't want to hit redline.
Here is a video of where the RPM hits with launch control. Go to about 0:36s in.
Launch control doesn't even get to redline. It's like the old MSD launch control modules drag racers used. It misfires at whatever RPM you choose as you floor it, you don't want to hit redline.
Here is a video of where the RPM hits with launch control. Go to about 0:36s in.
