Launch control technique
03-23-2017, 04:11 AM
#48
Rennlist Member
Lehman - you make some good points but the bonding is coming off more as shouting than emphasis.
To the exchange of ideas - it seems to me that there is a lot of speculation. Does anyone really know all the parameters controlled y the Sport+ software? Is it truly logical to infer that 5K without SC causes less internal stress than 6K with SC? IMHO there is no way we can know the answer unless a Porsche engineer close to the design can comment. Anything else is speculation based on inference and assumption.
It's fast. It sounds like the car is going to explode. Only God and some engineers know how the Turbo in the video held together for 50 consecutive launches and I doubt any of us knows the impact on the drivetrain. Can't we just move on, past the discussion of good vs bad if all we have is opinions?
To the exchange of ideas - it seems to me that there is a lot of speculation. Does anyone really know all the parameters controlled y the Sport+ software? Is it truly logical to infer that 5K without SC causes less internal stress than 6K with SC? IMHO there is no way we can know the answer unless a Porsche engineer close to the design can comment. Anything else is speculation based on inference and assumption.
It's fast. It sounds like the car is going to explode. Only God and some engineers know how the Turbo in the video held together for 50 consecutive launches and I doubt any of us knows the impact on the drivetrain. Can't we just move on, past the discussion of good vs bad if all we have is opinions?
03-23-2017, 05:05 AM
#50
^^^^^
You might want to think twice about switching PSM off before launching.
The Sports Chrono package comes with Launch Control - if you don't have Sports Chrono you don't have the Porsche Launch Control function - Currently I have two PDK cars with it - the initiation is the same on both. It is very simple to use.
(a) Sports plus on
(b) Brake hard to the floor
(c) Accelerator hard to the floor (and do it quickly)
(d) Quickly step off brake
(e) The model and engine will govern the hold rev point - it optimises torque for a first gear to second gear pull
(f) The SC Launch Control initially allows a bit of wheel movement to ensure optimal traction and grip and minimise driveline shock
(g) rinse and repeat
(h) the difference between non-SC and SC is between 0.2s and 0.3s depending on model etc in the real world the difference between official times and actual times is large (e.g my S will run low 3s - officially its a 3.9s car)
Is it a useful function - yes if you're involved in timed events with static starts.................never used it on public roads.
You might want to think twice about switching PSM off before launching.
The Sports Chrono package comes with Launch Control - if you don't have Sports Chrono you don't have the Porsche Launch Control function - Currently I have two PDK cars with it - the initiation is the same on both. It is very simple to use.
(a) Sports plus on
(b) Brake hard to the floor
(c) Accelerator hard to the floor (and do it quickly)
(d) Quickly step off brake
(e) The model and engine will govern the hold rev point - it optimises torque for a first gear to second gear pull
(f) The SC Launch Control initially allows a bit of wheel movement to ensure optimal traction and grip and minimise driveline shock
(g) rinse and repeat
(h) the difference between non-SC and SC is between 0.2s and 0.3s depending on model etc in the real world the difference between official times and actual times is large (e.g my S will run low 3s - officially its a 3.9s car)
Is it a useful function - yes if you're involved in timed events with static starts.................never used it on public roads.
Last edited by randr; 03-23-2017 at 05:37 AM.
03-23-2017, 10:24 AM
#52
Racer
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Just for clarity, when you stop the brake and then the gas, does it actually say Launch Control Activated? Or does that not happen and the behavior is still the same, that the revs go up a bit while your sitting still.
03-23-2017, 10:33 AM
#53
Three Wheelin'
Sorry about the bold stuff.
Yeah it was kinda like shouting, and I all I was trying to was educate my fellow owners 991.2 base cars without Sport Chrono that yes in fact that they can launch their cars just like the owners of sport Chrono cars........except they will not be able to launch at the same rpm level as sport chrono owners ( this accounts for the .2 difference time difference with sport chrono and without).
It's funny that the Sport Chrono guys think that because they have sport chrono that their launch is less abusive when it's actually more abusive because their car is able to rev higher before launch and therefore to go faster.
Yeah it was kinda like shouting, and I all I was trying to was educate my fellow owners 991.2 base cars without Sport Chrono that yes in fact that they can launch their cars just like the owners of sport Chrono cars........except they will not be able to launch at the same rpm level as sport chrono owners ( this accounts for the .2 difference time difference with sport chrono and without).
It's funny that the Sport Chrono guys think that because they have sport chrono that their launch is less abusive when it's actually more abusive because their car is able to rev higher before launch and therefore to go faster.
03-23-2017, 10:35 AM
#54
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Sorry about the bold stuff.
Yeah it was kinda like shouting, and I all I was trying to was educate my fellow owners 991.2 base cars without Sport Chrono that yes in fact that they can launch their cars just like the owners of sport Chrono cars........except they will not be able to launch at the same rpm level as sport chrono owners ( this accounts for the .2 difference time difference with sport chrono and without).
It's funny that the Sport Chrono guys think that because they have sport chrono that their launch is less abusive when it's actually more abusive because their car is able to rev higher before launch and therefore to go faster.
Yeah it was kinda like shouting, and I all I was trying to was educate my fellow owners 991.2 base cars without Sport Chrono that yes in fact that they can launch their cars just like the owners of sport Chrono cars........except they will not be able to launch at the same rpm level as sport chrono owners ( this accounts for the .2 difference time difference with sport chrono and without).
It's funny that the Sport Chrono guys think that because they have sport chrono that their launch is less abusive when it's actually more abusive because their car is able to rev higher before launch and therefore to go faster.
You may actually be doing damage to your non-SC car.... but hey, go ahead and educate away.
03-23-2017, 10:51 AM
#59
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It's common sense.
Look on page 298 of your manual about hard launches being more taxing on the cars components.
Sport chrono, or non sport chrono, hard launches are harder on the car.
If you are able to achieve a faster time.....for example a sport chrono car being able to rev higher before launching.....
Again common sense would dictate that a lower elapsed time would be harder on the car. Again IMO common sense.
YMMV
Look on page 298 of your manual about hard launches being more taxing on the cars components.
Sport chrono, or non sport chrono, hard launches are harder on the car.
If you are able to achieve a faster time.....for example a sport chrono car being able to rev higher before launching.....
Again common sense would dictate that a lower elapsed time would be harder on the car. Again IMO common sense.
YMMV
Sorry, but making assumptions and speculations and then representing them as fact based on "Look I tried it and it seems to work" is reckless and potentially harmful. But please, go ahead.