Gen 1 991 Manual Gearbox change
04-11-2016, 01:06 PM
#31
Drifting
And I agree with your other points about suppliers as well.
04-11-2016, 10:09 PM
#32
Racer
Even if the part numbers haven't changed maybe the assembly tolerances/etc. have.
This is from "911 & Porsche World - January 2015" GTS introduction article.
" The replacement of the six-speed manual transmission, so loved on the 997 for its instantaneous, precise shift for the PDK-derived seven-speeder in the 991 has been a contentious issue since it was introduced. The seven-speed’s paucity of accuracy, lack of speed and general obstructiveness has been addressed. Porsche has worked on the weighting and friction,removing around 10% of the forces on it to the obvious benefit across its gate. It no longer baulks when it’s hurried, or slots inaccurately at lesser speeds, the improvement to the quality of its movement and pace meaning those who enjoy manual shifts and three-pedals can rejoice. That’s the case across the entire 991 line-up, all Carreras getting the improved shift developed for the GTS."
There was another published article where some Porsche engineer or project manager for the GTS mentioned improved manual shifting but I haven't found it yet but will post here if and when I do.
This is from "911 & Porsche World - January 2015" GTS introduction article.
" The replacement of the six-speed manual transmission, so loved on the 997 for its instantaneous, precise shift for the PDK-derived seven-speeder in the 991 has been a contentious issue since it was introduced. The seven-speed’s paucity of accuracy, lack of speed and general obstructiveness has been addressed. Porsche has worked on the weighting and friction,removing around 10% of the forces on it to the obvious benefit across its gate. It no longer baulks when it’s hurried, or slots inaccurately at lesser speeds, the improvement to the quality of its movement and pace meaning those who enjoy manual shifts and three-pedals can rejoice. That’s the case across the entire 991 line-up, all Carreras getting the improved shift developed for the GTS."
There was another published article where some Porsche engineer or project manager for the GTS mentioned improved manual shifting but I haven't found it yet but will post here if and when I do.
04-12-2016, 12:39 PM
#33
Even if the part numbers haven't changed maybe the assembly tolerances/etc. have.
This is from "911 & Porsche World - January 2015" GTS introduction article.
" The replacement of the six-speed manual transmission, so loved on the 997 for its instantaneous, precise shift for the PDK-derived seven-speeder in the 991 has been a contentious issue since it was introduced. The seven-speed’s paucity of accuracy, lack of speed and general obstructiveness has been addressed. Porsche has worked on the weighting and friction,removing around 10% of the forces on it to the obvious benefit across its gate. It no longer baulks when it’s hurried, or slots inaccurately at lesser speeds, the improvement to the quality of its movement and pace meaning those who enjoy manual shifts and three-pedals can rejoice. That’s the case across the entire 991 line-up, all Carreras getting the improved shift developed for the GTS."
There was another published article where some Porsche engineer or project manager for the GTS mentioned improved manual shifting but I haven't found it yet but will post here if and when I do.
This is from "911 & Porsche World - January 2015" GTS introduction article.
" The replacement of the six-speed manual transmission, so loved on the 997 for its instantaneous, precise shift for the PDK-derived seven-speeder in the 991 has been a contentious issue since it was introduced. The seven-speed’s paucity of accuracy, lack of speed and general obstructiveness has been addressed. Porsche has worked on the weighting and friction,removing around 10% of the forces on it to the obvious benefit across its gate. It no longer baulks when it’s hurried, or slots inaccurately at lesser speeds, the improvement to the quality of its movement and pace meaning those who enjoy manual shifts and three-pedals can rejoice. That’s the case across the entire 991 line-up, all Carreras getting the improved shift developed for the GTS."
There was another published article where some Porsche engineer or project manager for the GTS mentioned improved manual shifting but I haven't found it yet but will post here if and when I do.
Could it be this Chris Harris article?
"The shift is now much better than earlier versions of the 7-speeder, even if the 5th-6th-7th relationship doesn’t quite feel entirely natural. I’m reveling it being in a manual again, I love the fact that car is only as good as my inputs – and I refuse to use the automatic blipping software that cuts-in when you’re in Sports mode!"
The latter portion also seems to imply there is rev matching software that kicks in when downshifting. I do not believe my 2012.5 7-speed has anything like this.
04-12-2016, 02:50 PM
#34
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https://www.goodwood.com/grrc/road/t...7yx5V3X4pHy.97
Could it be this Chris Harris article?
"The shift is now much better than earlier versions of the 7-speeder, even if the 5th-6th-7th relationship doesn’t quite feel entirely natural. I’m reveling it being in a manual again, I love the fact that car is only as good as my inputs – and I refuse to use the automatic blipping software that cuts-in when you’re in Sports mode!"
The latter portion also seems to imply there is rev matching software that kicks in when downshifting. I do not believe my 2012.5 7-speed has anything like this.
Could it be this Chris Harris article?
"The shift is now much better than earlier versions of the 7-speeder, even if the 5th-6th-7th relationship doesn’t quite feel entirely natural. I’m reveling it being in a manual again, I love the fact that car is only as good as my inputs – and I refuse to use the automatic blipping software that cuts-in when you’re in Sports mode!"
The latter portion also seems to imply there is rev matching software that kicks in when downshifting. I do not believe my 2012.5 7-speed has anything like this.
04-12-2016, 06:16 PM
#35
Rennlist Member
Yes, as an example of something that was frowned upon as poor engineering practice in the pre-ISO9000 days and would now be considered completely unacceptable in any organization I'm familiar with.
04-13-2016, 11:21 PM
#36
Racer
Here is a part of the article (911 & Porsche World - December 2015) that infers Porsche improved the shifter for the GTS from the previous 7 speed. This is the article that I referred to in my earlier post above.
04-14-2016, 02:02 PM
#38
I've traded a 2012 991 C2S Manual for my 2013 991 C2S Manual and both cars were identical when it came to shifting. The main difference is the "Rev Matching" feature that Porsche secretly added during the 2013 model year (earlier produced 2013 911s do not have the "rev-matching" feature). The RM feature is not mentioned anywhere in my car's paperwork.
I should also mention that the "Hill Assist" feature was greatly improved on the 2013.
I should also mention that the "Hill Assist" feature was greatly improved on the 2013.
04-16-2016, 08:11 PM
#39
Banned
I've traded a 2012 991 C2S Manual for my 2013 991 C2S Manual and both cars were identical when it came to shifting. The main difference is the "Rev Matching" feature that Porsche secretly added during the 2013 model year (earlier produced 2013 911s do not have the "rev-matching" feature). The RM feature is not mentioned anywhere in my car's paperwork.
I should also mention that the "Hill Assist" feature was greatly improved on the 2013.
I should also mention that the "Hill Assist" feature was greatly improved on the 2013.
The upgrade was worth the wait because it somehow recaptured some of the essence of the old. Still feel that it's a bit to foward but all else is forgiven. Smoothest transmission yet with a lighter clutch pedal to boot. The 997.2 that I previously owned had a sweet 6 speed that was just right. Porsche has re-engineering the 7 in the right direction. Sadly I don't ever use 7th unless I'm on a road trip. Surely it was a gas saving strategy from porsche.
