Final consensus on 4.0 LWFW on 997.2 GT3 ?
11-20-2018, 11:55 AM
#1
Instructor
Thread Starter
Final consensus on 4.0 LWFW on 997.2 GT3 ?
Hello,
My 2010 GT3 needs a clutch and/or clutch part. Won't know until it's open. Pedal is getting stiffer, creaky, and shifting is less precise than it used to.
Spent a few hours yesterday reading threads on the 4.0 RS clutch upgrade for 997.2 GT3's. My understanding so far:
3.6 of all generations don't seem to have problem with vibrational issues
997.2 3.8 GT3 RS has issues out of the box, including pressure plate and clutches and bearings, possibly due to lightweight flywheel causing vibrations. Issues exacerbated with 4.0 clutch/flywheel upgrade.
997.2 3.8 GT3 has no (or very few) issues out of box due to dual mass flywheel. Has issues with 4.0 clutch/flywheel upgrade by itself.
So .. having said all that -- is there any conclusive data or even any anecdotes that the Dundon damper will solve the issues with upgrading to an 4.0 clutch setup? Or is it all just precautionary/speculative at this point still? Is it still a risk to go lightweight?
I was unable to find any threads post-2017 regarding this matter.
Thanks!
My 2010 GT3 needs a clutch and/or clutch part. Won't know until it's open. Pedal is getting stiffer, creaky, and shifting is less precise than it used to.
Spent a few hours yesterday reading threads on the 4.0 RS clutch upgrade for 997.2 GT3's. My understanding so far:
3.6 of all generations don't seem to have problem with vibrational issues
997.2 3.8 GT3 RS has issues out of the box, including pressure plate and clutches and bearings, possibly due to lightweight flywheel causing vibrations. Issues exacerbated with 4.0 clutch/flywheel upgrade.
997.2 3.8 GT3 has no (or very few) issues out of box due to dual mass flywheel. Has issues with 4.0 clutch/flywheel upgrade by itself.
So .. having said all that -- is there any conclusive data or even any anecdotes that the Dundon damper will solve the issues with upgrading to an 4.0 clutch setup? Or is it all just precautionary/speculative at this point still? Is it still a risk to go lightweight?
I was unable to find any threads post-2017 regarding this matter.
Thanks!
11-20-2018, 12:15 PM
#2
Rennlist Member
I’ve researched this to death. The main theory is harmonics loosening the actuator bolts which causes engine damage. So you have 2 options IF you decide to do the lwfw.
1) Get the Dundon Dampener to deal with the engine harmonics. It’s not 100% proven it works but it seems to be the fix. And my RS does have the dampener. It doesn’t not affect the lwfw driving dynamic at all.
2) Get the latest Porsche actuators (they have revised these parts 3 times) and install: I believe they are $4800 ish parts alone.
Of course the 3rd option is just to install a 4.0 clutch and keep the dual mass flywheel.
1) Get the Dundon Dampener to deal with the engine harmonics. It’s not 100% proven it works but it seems to be the fix. And my RS does have the dampener. It doesn’t not affect the lwfw driving dynamic at all.
2) Get the latest Porsche actuators (they have revised these parts 3 times) and install: I believe they are $4800 ish parts alone.
Of course the 3rd option is just to install a 4.0 clutch and keep the dual mass flywheel.
11-20-2018, 01:00 PM
#3
Drifting
I’ve researched this to death. The main theory is harmonics loosening the actuator bolts which causes engine damage. So you have 2 options IF you decide to do the lwfw.
1) Get the Dundon Dampener to deal with the engine harmonics. It’s not 100% proven it works but it seems to be the fix. And my RS does have the dampener. It doesn’t not affect the lwfw driving dynamic at all.
2) Get the latest Porsche actuators (they have revised these parts 3 times) and install: I believe they are $4800 ish parts alone.
Of course the 3rd option is just to install a 4.0 clutch and keep the dual mass flywheel.
1) Get the Dundon Dampener to deal with the engine harmonics. It’s not 100% proven it works but it seems to be the fix. And my RS does have the dampener. It doesn’t not affect the lwfw driving dynamic at all.
2) Get the latest Porsche actuators (they have revised these parts 3 times) and install: I believe they are $4800 ish parts alone.
Of course the 3rd option is just to install a 4.0 clutch and keep the dual mass flywheel.
11-20-2018, 01:14 PM
#4
Rennlist Member
The only warnings I have heard of came from Alex when I spoke to him. Its described as a cat scratching at a door type of sound. What is actually happening is the loosed bolt is scratching at the cam actuator cover.
11-20-2018, 01:22 PM
#6
Rennlist Member
11-20-2018, 02:10 PM
#7
Instructor
Thread Starter
OK. Good to know. I'm talking to BBI now about just doing it all since I'm doing coolant tubes as well. Screw it, might as well fix literally everything in one go.