991 cup shifter in 997 cup?
08-02-2013, 01:17 PM
#4
Nordschleife Master
What many people don't know is that the RSR gearbox really comes from Ricardo. And with the 991 it is being openly admitted that it's their gearbox. Now whether they redesigned it and refined it for the 991 or if it is the same basic gearbox as the current RSR gearbox is still a question I don't know the answer to.
As for the question of why do it over just adding KMP's or someone else's paddle shift kit? The answer is ring and pinion location. The RSR and 991 Cup gearboxes use a drop gear off the output shaft to transfer power to the ring and pinion. It allows better suspension geometry and drop of the car without putting too much angle on the drive axles. For many people it's not enough of an issue to warrant the expense. But at the top level where some teams will continue to run 1-2 year old cars for another season or two before buying 991s it's the right way to do it.
08-02-2013, 10:46 PM
#5
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Given that the Grand Am guys have been putting the RSR gearbox into their cars for a couple years, I'm going to guess yes. I suspect we are going to fairly shortly see some top level 2011 and 2012 pro cars get updated to 991 spec.
What many people don't know is that the RSR gearbox really comes from Ricardo. And with the 991 it is being openly admitted that it's their gearbox. Now whether they redesigned it and refined it for the 991 or if it is the same basic gearbox as the current RSR gearbox is still a question I don't know the answer to.
As for the question of why do it over just adding KMP's or someone else's paddle shift kit? The answer is ring and pinion location. The RSR and 991 Cup gearboxes use a drop gear off the output shaft to transfer power to the ring and pinion. It allows better suspension geometry and drop of the car without putting too much angle on the drive axles. For many people it's not enough of an issue to warrant the expense. But at the top level where some teams will continue to run 1-2 year old cars for another season or two before buying 991s it's the right way to do it.
What many people don't know is that the RSR gearbox really comes from Ricardo. And with the 991 it is being openly admitted that it's their gearbox. Now whether they redesigned it and refined it for the 991 or if it is the same basic gearbox as the current RSR gearbox is still a question I don't know the answer to.
As for the question of why do it over just adding KMP's or someone else's paddle shift kit? The answer is ring and pinion location. The RSR and 991 Cup gearboxes use a drop gear off the output shaft to transfer power to the ring and pinion. It allows better suspension geometry and drop of the car without putting too much angle on the drive axles. For many people it's not enough of an issue to warrant the expense. But at the top level where some teams will continue to run 1-2 year old cars for another season or two before buying 991s it's the right way to do it.
Given that this will extend the life of 997 Cup transmission as well as eliminate the chance of mis-shift explosions it should be fair to say the market for used 997 Cups will have a shot at a decent shelf life with this paddle shift technology.
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08-04-2013, 09:14 AM
#8
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Stu - yes it can.
Here's an 06 with an optional KMP: http://www.wrightmotorsports.com/2006-porsche-997-gt3/
Here's an 06 with an optional KMP: http://www.wrightmotorsports.com/2006-porsche-997-gt3/
Would you consider moving into a paddle shift system?
08-04-2013, 11:27 AM
#9
Drifting
KMP is interesting, and all rave reviews so far...I just wonder if it would take away some of the fun factor.
08-06-2013, 09:58 AM
#11
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Given that the Grand Am guys have been putting the RSR gearbox into their cars for a couple years, I'm going to guess yes. I suspect we are going to fairly shortly see some top level 2011 and 2012 pro cars get updated to 991 spec.
What many people don't know is that the RSR gearbox really comes from Ricardo. And with the 991 it is being openly admitted that it's their gearbox. Now whether they redesigned it and refined it for the 991 or if it is the same basic gearbox as the current RSR gearbox is still a question I don't know the answer to.
As for the question of why do it over just adding KMP's or someone else's paddle shift kit? The answer is ring and pinion location. The RSR and 991 Cup gearboxes use a drop gear off the output shaft to transfer power to the ring and pinion. It allows better suspension geometry and drop of the car without putting too much angle on the drive axles. For many people it's not enough of an issue to warrant the expense. But at the top level where some teams will continue to run 1-2 year old cars for another season or two before buying 991s it's the right way to do it.
What many people don't know is that the RSR gearbox really comes from Ricardo. And with the 991 it is being openly admitted that it's their gearbox. Now whether they redesigned it and refined it for the 991 or if it is the same basic gearbox as the current RSR gearbox is still a question I don't know the answer to.
As for the question of why do it over just adding KMP's or someone else's paddle shift kit? The answer is ring and pinion location. The RSR and 991 Cup gearboxes use a drop gear off the output shaft to transfer power to the ring and pinion. It allows better suspension geometry and drop of the car without putting too much angle on the drive axles. For many people it's not enough of an issue to warrant the expense. But at the top level where some teams will continue to run 1-2 year old cars for another season or two before buying 991s it's the right way to do it.
08-14-2013, 09:07 AM
#14
Rennlist Member
The 991 uses a RSR style "inverted transmission" The main shaft is below the pinion and a drop gear is used. This gives better axle angle on a low ride height car. It also was designed as a sequential from the start so the shift drum runs the entire length of the transmission. The conventional 997 sequential uses Holinger internals in a Porsche case. There is not that much difference in feel but the RSR shifts a tiny bit better. The gears in the older style are actually larger and probably more robust than the RSR style. Converting to the RSR requires a lot more than bolting in on. Different trans mounts, water lines in the tunnel and on top of the engine, **** rod, axles ect.. It was a 100k conversion for the grand-am teams. Just add the paddle shift kit to the older 997's and call it a day. 
08-14-2013, 01:47 PM
#15
Nordschleife Master
It's purely speculation on my part that since Ricardo also makes the 991 Cup gearbox that there might be some parts crossover and that it isn't as "all new" as we are being told.