PDK Weight Optimization
06-12-2010, 11:15 PM
#2
Race Director
I do not think that changing out the bearing would amount to much weight savings.
Reguardless of the weight of the PDK over a 6 speed manual...car for car the PDK will be faster due to fast gear changes and a better gear ratio.
Reguardless of the weight of the PDK over a 6 speed manual...car for car the PDK will be faster due to fast gear changes and a better gear ratio.
06-12-2010, 11:19 PM
#3
By themselves, I am sure you are correct and the bearings will only yield a few pounds. But one has to start somewhere. The interesting question is what will add up to 20 to 30 lbs.
06-13-2010, 02:05 AM
#4
Nordschleife Master
sounds like quite a bit of work for just a few lb's here and there, maybe look into buying a treadmill, would be cheaper and easier way to lose weight on the car.. ;-) or go for lighter wheels and lose weight where it matters most.
06-13-2010, 03:29 AM
#5
Nordschleife Master
The 60 odd pounds PDK weighs over a manual are really irrelevant. I purposefully ordered my car nixing Bose and ordering manual sports seats. That weight savings is worthwhile.
06-13-2010, 05:00 AM
#6
I disagree. The 25kg extra weight of the PDK is significant in two regards:
0-60 times flatter the PDK's performance when, in real-world driving, it is in-gear acceleration which makes a car faster (and feel it). The manual C2S is half a second (yes, nearly 10%!!!) faster in Porsche's official in-gear figures (source: Porsche 911 handbook).
These cars are not about straight-line speed. They are, above all, about how they feel in the twisties. And that extra weight (the equivalent of a child on board) is going to hurt cornering feel and performance.
0-60 times flatter the PDK's performance when, in real-world driving, it is in-gear acceleration which makes a car faster (and feel it). The manual C2S is half a second (yes, nearly 10%!!!) faster in Porsche's official in-gear figures (source: Porsche 911 handbook).
These cars are not about straight-line speed. They are, above all, about how they feel in the twisties. And that extra weight (the equivalent of a child on board) is going to hurt cornering feel and performance.
06-13-2010, 08:36 AM
#7
Reducing considerable amounts of weight in PDK or a manual transmission, particularly rotating weight (and, in the case of ceramic bearings, also providing a better, reduced friction bearing surface) will help. Notwithstanding, it is true that the average amateur driver will generally not be able to take full, if any, advantage of it and so a treadmill might be even more usefull.
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06-13-2010, 11:21 AM
#8
Race Director
Ceramic bearings that can withstand the loads/forces in the PDK may not be that much lighter than their steel counterparts.
Besides if the extra weight of the PDK is so horrendous that one is contemplating incurring what can only be a huge expense to have PDK bearings swapped out and replaced with possibly lighter ones in an attempt to lighten the car why in the world was PDK checked on the order form to begin with?
Sincerely,
Macster.
06-13-2010, 11:28 AM
#9
Sir:
Not trying to sell anything, was simply asking. As to why, in street use there is no reason. In race, and not club race use, there may be many good reasons in a paddle shift type transmission.
Not trying to sell anything, was simply asking. As to why, in street use there is no reason. In race, and not club race use, there may be many good reasons in a paddle shift type transmission.
06-13-2010, 11:31 AM
#10
Three Wheelin'
I disagree. The 25kg extra weight of the PDK is significant in two regards:
0-60 times flatter the PDK's performance when, in real-world driving, it is in-gear acceleration which makes a car faster (and feel it). The manual C2S is half a second (yes, nearly 10%!!!) faster in Porsche's official in-gear figures (source: Porsche 911 handbook).
These cars are not about straight-line speed. They are, above all, about how they feel in the twisties. And that extra weight (the equivalent of a child on board) is going to hurt cornering feel and performance.
0-60 times flatter the PDK's performance when, in real-world driving, it is in-gear acceleration which makes a car faster (and feel it). The manual C2S is half a second (yes, nearly 10%!!!) faster in Porsche's official in-gear figures (source: Porsche 911 handbook).
These cars are not about straight-line speed. They are, above all, about how they feel in the twisties. And that extra weight (the equivalent of a child on board) is going to hurt cornering feel and performance.
06-13-2010, 11:40 AM
#11
Burning Brakes
06-13-2010, 11:44 AM
#12
Race Director
You can install a light weight fly wheel in for the PDK. That will reduce somewhere around 17lbs. See the June issue of Excellence. Possibly ceramic beering would reduce rolling resistance but does anyone make these bearings and how will they hold up?
06-13-2010, 12:44 PM
#13
Three Wheelin'
I thought that new turbo was supposed to overcome any PDK weight issues, no?
06-13-2010, 01:24 PM
#14
Nordschleife Master
06-13-2010, 01:27 PM
#15
Nordschleife Master
--
Side note: once again these threads turn out the prejudiced manual-tranny-owners bashing the PDK in one way or another. One does not see threads by PDK owners trashing the 6-speed manual. I've had both trannies - I like them both and I do not trash one over the other.