997CUP gear box - How much can you get out of it ?
#1
997CUP gear box - How much can you get out of it ?
Hi
What's your experience with the 997 CUP gearbox life expectancy when equiped with paddles ?
Still needs rebuild after 6000 miles or so ? And still as expensive to rebuild ?
Looking at a 2011 with paddles, c.a. 5000miles since rebuild.
Also is it possible to downshift to soon and over rev or are the aftermarket systems around intelligent enough to override early downshifts ?
Thx
What's your experience with the 997 CUP gearbox life expectancy when equiped with paddles ?
Still needs rebuild after 6000 miles or so ? And still as expensive to rebuild ?
Looking at a 2011 with paddles, c.a. 5000miles since rebuild.
Also is it possible to downshift to soon and over rev or are the aftermarket systems around intelligent enough to override early downshifts ?
Thx
#2
I think the rebuilds are based on time vs mileage. My tranny got rebuilt every 35 hours with a bump shifter and mechanical blipper. I'm planning to stretch that interval a bit with a paddle shift since it's supposed to be a little easier on the gearbox.
As far as over-rev protection, I don't know if all the systems have it, but I do know the Holinger and Mega Line have it as part of the included software.
As far as over-rev protection, I don't know if all the systems have it, but I do know the Holinger and Mega Line have it as part of the included software.
#3
Thanks
Cost for the rebuild ?
Heard horror stories... 25/30k USD, that's before autoblip and paddles. I guess these extras should not change the cost and frequency, just reduce the flat spots and risk of missed heel&toe.
Cost for the rebuild ?
Heard horror stories... 25/30k USD, that's before autoblip and paddles. I guess these extras should not change the cost and frequency, just reduce the flat spots and risk of missed heel&toe.
#4
Horror stories are true. Pretty expensive for a rebuild with all Porsche parts. Cost of rebuild goes down after gearbox doesn't need to be rebuilt by PMNA and sealed per series rules. Gearboxes can be rebuilt by a good shop using aftermarket parts for a much lower price. Prices vary so
it's a good idea to shop around.
As far as extending the interval, maybe someone who has had enough time and experience with a 997 with paddle shifters can chime in with their new rebuild interval.
Keep in mind that nearly every moving part on the car is on the clock.
it's a good idea to shop around.
As far as extending the interval, maybe someone who has had enough time and experience with a 997 with paddle shifters can chime in with their new rebuild interval.
Keep in mind that nearly every moving part on the car is on the clock.
#5
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I have been doing about 45 hours before open and refresh with KMP paddles in a 997.2 Cup. Trans was in great shape and only needed one dog and one bearing. Not too expensive. Paddles save the over revs too. Not a single over rev since I installed my paddles. Love them.
Stu
Stu
#6
Drifting
Paddles or not, the life of your gear$ does not change, especially 3rd gear that takes a beating.
Matt (GT Gears) posted a thorough synopsis on this subject a while back.
My Cup box was opened up by the shop that rebuilt it at 40ish hours of paddle use and they were amazed at how good things spec'd out and virtually no wear. Note: the box was rebuilt at the same time as paddles were installed. At the time, the paddle systems just came out there was no verifiable data...so we were curious to see the results. For reduced wear -- big thumbs up on paddles, but you still have to time out the gears or you are asking for that big repair bill you mentioned.
__________________
2014 997 GT3-R
2010 997 Cup Car
1989 911 3.2 Coupe
Matt (GT Gears) posted a thorough synopsis on this subject a while back.
My Cup box was opened up by the shop that rebuilt it at 40ish hours of paddle use and they were amazed at how good things spec'd out and virtually no wear. Note: the box was rebuilt at the same time as paddles were installed. At the time, the paddle systems just came out there was no verifiable data...so we were curious to see the results. For reduced wear -- big thumbs up on paddles, but you still have to time out the gears or you are asking for that big repair bill you mentioned.
__________________
2014 997 GT3-R
2010 997 Cup Car
1989 911 3.2 Coupe
Last edited by FLA997; 02-19-2017 at 04:15 PM.
#7
Drifting
I have an estimated 55 hours on my 997.1 gearbox and upon recent inspection it was pristine. I have a blipper and use the clutch on all downshifts which may improve longevity.
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#9
you still have to time out the gears or you are asking for that big repair bill
I have an estimated 55 hours on my 997.1 gearbox and upon recent inspection it was pristine.
#10
Drifting
Agreed. I did a little digging around in my tech manuals and discovered Porsche specified rebuilds every 20 hours for sprint races and 30 hours for endurance races. I know these are overly conservative, but 40+ hours is more than double that specification. I have to admit I like the idea of extending the rebuild interval, but at 35 hrs I'm already extended and I guess I'm too chicken to extend it further. I've had my share of DNFs due to gearbox failures. I think I'll either tighten up or stick with my existing schedule. Besides, with the cost of a rebuild down considerably, it's worth it just for the peace of mind.
I think the Porsche Motorsports intervals are conservative as well. With the exception of the 4.0L 2 Ring Engine (good idea to stick to the manual recc. rebuild hours on that one), I think I've pushed the limits way beyond what the manual says on every other part in the past...but I don't make a practice of doing that any longer.
#14
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