lofi Posted February 9, 2020 Report Share Posted February 9, 2020 Whilst I wait for my car to sell (still) something I read about PDK and SportsChrono peaked my interest. I read somewhere that as a second hand purchase this combo had a risk because of the unknown number of launch starts. So I guess the question is whether a large number of launch starts is an issue for the longevity of the drivetrain and if it is, is there a way of telling how many times launch start has been used? I'm of the option that launch is very unlikely to have been used many times, I mean when would you use it, and so it is unlikely to be an issue. Link to comment Share on other sites More sharing options...
RBD914 v2 Posted February 9, 2020 Report Share Posted February 9, 2020 Never used launch control in any of my cars. Used it in a Porsche owned vehicle on a track only. I know that Porsche test all manual cars for over revving, not something they need to do on PDK cars as the gearbox won't allow over revving to occur. Constant use of LC would put a strain on engine and gearbox I would have thought. The odd one now and then shouldn't hurt it. How do you tell - no idea! Link to comment Share on other sites More sharing options...
lofi Posted February 9, 2020 Author Report Share Posted February 9, 2020 6 minutes ago, RBD914 v2 said: How do you tell - no idea! Wonder if like over-revs it is stored in the computer somewhere - though my current take is that no-one really uses it Link to comment Share on other sites More sharing options...
r1flyguy Posted February 9, 2020 Report Share Posted February 9, 2020 When I did the Silverstone EC day in their turboS the instructor said the car could do unlimited launches with no detrimental effect to the wear & tear on the drivetrain etc. How true this is I’m unsure but I did put the theory to the test in their car with many launches and the equal amount of grins Link to comment Share on other sites More sharing options...
Mattman42 Posted February 9, 2020 Report Share Posted February 9, 2020 Used LC approx 6 times in the 18mths of having the car. Not really any use for it other than to make me giggle. Link to comment Share on other sites More sharing options...
RBD914 v2 Posted February 9, 2020 Report Share Posted February 9, 2020 4 minutes ago, lofi said: Wonder if like over-revs it is stored in the computer somewhere - though my current take is that no-one really uses it Yes, over revs stores on the car's ECU, they plug it in to a computer and can tell if it's been over revved, to what level and how many times. If it's bad then they won't buy it off you, apparently. Link to comment Share on other sites More sharing options...
r1flyguy Posted February 9, 2020 Report Share Posted February 9, 2020 4 minutes ago, RBD914 v2 said: Yes, over revs stores on the car's ECU, they plug it in to a computer and can tell if it's been over revved, to what level and how many times. If it's bad then they won't buy it off you, apparently. But you can’t over rev a pdk!! Or can you??? Link to comment Share on other sites More sharing options...
RBD914 v2 Posted February 9, 2020 Report Share Posted February 9, 2020 Just now, r1flyguy said: But you can’t over rev a pdk!! Or can you??? Not according to the dealer, PDK refuses to down shift into a gear that will cause over revving. Whereas human error hitting 1st from flat out in 6th....... Which is how most over revving happens apparently. Link to comment Share on other sites More sharing options...
lofi Posted February 9, 2020 Author Report Share Posted February 9, 2020 1 minute ago, r1flyguy said: But you can’t over rev a pdk!! can you??? Over revs is a red herring. The computer stores ignition instances in a number of rev ranges, including ranges beyond the red line. A PDK, like a Tip, should have no ignitions in those ranges. Number of ignitions and how long ago are stored. I am wondering if the computer also stores the number of times the launch has been used (completely separate from over revs). Link to comment Share on other sites More sharing options...
Richard Hamilton Posted February 9, 2020 Report Share Posted February 9, 2020 I know from experience with my previous 2.9 PDK that it will store ignitions in Rev Range 1 if you hit the rev limiter. As far as I know, there is no register of the number of launch control uses. It certainly doesn't show in a normal Vehicle Analysis Log. Link to comment Share on other sites More sharing options...
lofi Posted February 9, 2020 Author Report Share Posted February 9, 2020 14 minutes ago, Richard Hamilton said: I know from experience with my previous 2.9 PDK that it will store ignitions in Rev Range 1 if you hit the rev limiter. As far as I know, there is no register of the number of launch control uses. It certainly doesn't show in a normal Vehicle Analysis Log. Yes, should look something like this for a tip or PDK. More recent cars have more ranges recorded Interesting that number of launches isn't logged. Link to comment Share on other sites More sharing options...
Gutley Posted February 9, 2020 Report Share Posted February 9, 2020 28 minutes ago, lofi said: Interesting that number of launches isn't logged Its would be more interesting if it was. ... Since Porsche say using LC has no detrimental affect on the car, what would be the point of logging it. Logging it would imply they suspect there could be an issue. Link to comment Share on other sites More sharing options...
lofi Posted February 9, 2020 Author Report Share Posted February 9, 2020 It is recorded. This is the DME print out from a 997 GTS In this case launch control hasn't been used Link to comment Share on other sites More sharing options...
RickLS7 Posted February 9, 2020 Report Share Posted February 9, 2020 Can't help myself, I love this video: Link to comment Share on other sites More sharing options...
RBD914 v2 Posted February 9, 2020 Report Share Posted February 9, 2020 ".....the most pointless invention ever" Which why I never use it in my car! Link to comment Share on other sites More sharing options...
rowbos Posted February 9, 2020 Report Share Posted February 9, 2020 I've used LC on a couple of occasions at the PEC and the instructor told me it could be used multiple times in a row without issue (so I did!). I've used LC on my own car a few times just for laughs... I'm sure I read PDK could potentially over rev if driving downhill and you you manually change down too many gears... Link to comment Share on other sites More sharing options...
Menoporsche Posted February 9, 2020 Report Share Posted February 9, 2020 There’s a vid somewhere where they did 50 or 100 LCs in a row just to show how tough the car is. Link to comment Share on other sites More sharing options...
daz05 Posted February 10, 2020 Report Share Posted February 10, 2020 The transmission and drive train in these is quite strong and they don't appear to be the type of car that are launched over and over again. It's not really that kind of car, 1 or 2 hooligans in here maybe (don't watch my videos!). Conversely, I have a Golf 7R as a second car and a fair proportion, based on what I read, are tuned and 'launched' fairly consistently to no real ill effect, you see the odd failure but generally only on the cars running over 100bhp more than they should be. Link to comment Share on other sites More sharing options...
lofi Posted February 10, 2020 Author Report Share Posted February 10, 2020 Thanks all, will cross that off my concerns list Link to comment Share on other sites More sharing options...
RickLS7 Posted February 10, 2020 Report Share Posted February 10, 2020 There’s a list of conditions on the use of launch control on my BMW. Must admit to having never used it but the car has to be up to temperature and you can’t relaunch in less than 2 minutes and probably more I can’t remember. Porsche on the other hand once launched a GT3 five hundred times consecutively so not something to worry about. What I look for if buying privately is how an owner treats their car. If they thrash the engine when it’s cold when giving you a test drive, I would walk away. You obviously won’t know that buying from a dealer though. Link to comment Share on other sites More sharing options...
Menoporsche Posted February 10, 2020 Report Share Posted February 10, 2020 Fifty times in a row. Or according to the blurb underneath, 61. Link to comment Share on other sites More sharing options...
Gutley Posted February 10, 2020 Report Share Posted February 10, 2020 16 minutes ago, Menoporsche said: Fifty times in a row. Or according to the blurb underneath, 61. Anybody got access to a closed runway? 😀 Link to comment Share on other sites More sharing options...
Menoporsche Posted February 10, 2020 Report Share Posted February 10, 2020 ....and @r1flyguy's car while he's in Asia? Link to comment Share on other sites More sharing options...
r1flyguy Posted February 10, 2020 Report Share Posted February 10, 2020 21 minutes ago, Menoporsche said: ....and @r1flyguy's car while he's in Asia? 😂 Link to comment Share on other sites More sharing options...
mneil Posted February 10, 2020 Report Share Posted February 10, 2020 1 hour ago, r1flyguy said: 😂 An upgrade to your Captains uniform Sir? 😷 Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.