Tracked GT3/GT2 Must Have Clutch Replacement Every 8k Miles or Less
05-06-2013, 11:39 PM
#46
If you track your GT3/GT3RS/GT3RS 4.0/GT2RS you should plan the time and budget for regular clutch and associated parts replacement, at least every 6000-8000 miles.
Slave cylinders, pressure plates, discs and throwout bearings are simply not robust and durable enough for regular track use. Even when "upgraded" to the 4.0 disc/pressure plate, the throwout bearing and slave cylinder are regular wear/replacement items.
If you have never bled your slave cylinder, do so and look at what comes out- that black gunk is the result of internal cylinder bore wear. The rod end of the slave severely wears against the fork and the fork severely wears the throwout bearing. This is why Cup cars have a totally different clutch disengagement system and a hydraulic throwout bearing.
Shame on Porsche (again), all the money is channeled into marketing and profit and not into high-quality parts. Lied to again...
Either add this to your list of regular replacement parts or plan to be stranded on the road or at the track. Those of you who track already have learned this expensive lesson and those are just getting into Porsche GT cars will learn it and need to be aware.
Slave cylinders, pressure plates, discs and throwout bearings are simply not robust and durable enough for regular track use. Even when "upgraded" to the 4.0 disc/pressure plate, the throwout bearing and slave cylinder are regular wear/replacement items.
If you have never bled your slave cylinder, do so and look at what comes out- that black gunk is the result of internal cylinder bore wear. The rod end of the slave severely wears against the fork and the fork severely wears the throwout bearing. This is why Cup cars have a totally different clutch disengagement system and a hydraulic throwout bearing.
Shame on Porsche (again), all the money is channeled into marketing and profit and not into high-quality parts. Lied to again...
Either add this to your list of regular replacement parts or plan to be stranded on the road or at the track. Those of you who track already have learned this expensive lesson and those are just getting into Porsche GT cars will learn it and need to be aware.
05-07-2013, 01:06 AM
#47
Rennlist Member
Has there been a perfect car out there on track? I think savy means well but damn like to hear prefacto not postfacto. Is the camaro and the mono made out to be the perfect car for track just not on paper? We'll find out. Mike
05-07-2013, 01:25 AM
#48
Rennlist Member
I think it goes without saying that 3.8 rs cars have defective pressure plates from the factory... Every car has its quirks. Porsche has corrected this problem in the future by superceding that part # with the same one as on the rs 4.0. You can no longer buy the faulty riveted plates.
05-07-2013, 02:24 AM
#49
GT3 player par excellence
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I think it goes without saying that 3.8 rs cars have defective pressure plates from the factory... Every car has its quirks. Porsche has corrected this problem in the future by superceding that part # with the same one as on the rs 4.0. You can no longer buy the faulty riveted plates.
05-07-2013, 03:15 AM
#50
Rennlist Member
Data point: 2010 GT3. TO bearing went bad and replaced under warranty at 12K; pressure plate and clutch had minimal wear when they opened her up. My guess is the non-RS cars are a bit more stout but far from perfect.
05-07-2013, 07:40 AM
#51
Dual mass saves the clutch's and only good way to run a solid centre plate for road use.
The higher torque of the 3.8 and 4.0 and greater engine rotating mass plus harmonics give the clutch a harder time.
All GT's have tall first gears which really hurts the clutch as well.
8k on the track is good in my book. Pay to play.
Jay
The higher torque of the 3.8 and 4.0 and greater engine rotating mass plus harmonics give the clutch a harder time.
All GT's have tall first gears which really hurts the clutch as well.
8k on the track is good in my book. Pay to play.
Jay
05-07-2013, 09:01 AM
#52
Nordschleife Master
I think it goes without saying that 3.8 rs cars have defective pressure plates from the factory... Every car has its quirks. Porsche has corrected this problem in the future by superceding that part # with the same one as on the rs 4.0. You can no longer buy the faulty riveted plates.
They fail in the same place
05-07-2013, 10:55 AM
#53
Rennlist Member
Not to oversimplify, but, more shifts = more wear, it's that simple.
The .2RS has lower gearing (and more power) than all previous GT3s, therefore, you shift typically 30-50% more than all other GT3's. This means your throwout bearing wears ALOT more quickly, along with the other components.
I would say the throwout bearing is the real "consumable" that needs preventative maintenance. For a .2RS, upgrade to the 4.0 PP, and then replace TO bearing regularly. I'm replacing mine at the end of this season, unless symptoms show up before then. Every 1-2 years is probably sufficient, depending on which model you have and how many track miles.
Speed costs money, and these cars are damn fast.
The .2RS has lower gearing (and more power) than all previous GT3s, therefore, you shift typically 30-50% more than all other GT3's. This means your throwout bearing wears ALOT more quickly, along with the other components.
I would say the throwout bearing is the real "consumable" that needs preventative maintenance. For a .2RS, upgrade to the 4.0 PP, and then replace TO bearing regularly. I'm replacing mine at the end of this season, unless symptoms show up before then. Every 1-2 years is probably sufficient, depending on which model you have and how many track miles.
Speed costs money, and these cars are damn fast.
05-07-2013, 03:43 PM
#54
Not a clutch expert at all and asking an honest "don't know" question.
Would a hydraulic throw out bearing "upgrade" on a stock setup extend the TO bearing PM schedule? Would reduce the slight side load from the fork, haven't analyzed the stock TO bearing for why it's failing but would be interested in some opinions...
We can't be the only car that is hard on clutches and they're really not so specialized to be porsche specific...
Would a hydraulic throw out bearing "upgrade" on a stock setup extend the TO bearing PM schedule? Would reduce the slight side load from the fork, haven't analyzed the stock TO bearing for why it's failing but would be interested in some opinions...
We can't be the only car that is hard on clutches and they're really not so specialized to be porsche specific...
05-07-2013, 10:28 PM
#55
Rennlist Member
I think it goes without saying that 3.8 rs cars have defective pressure plates from the factory... Every car has its quirks. Porsche has corrected this problem in the future by superceding that part # with the same one as on the rs 4.0. You can no longer buy the faulty riveted plates.
No biggy, warranty or later $2500-3000 every 12K miles or so.
But only if you do LOONG sessions in HOR weather and drive flatout.
Driving short sessions like TT or not in the heat or 9/10th. and I bet they last forever.
