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991.2's have an integrated dual mass flywheel with a centrifugal pendulum for both PDK and manual. 991.2's also moved to a double plate clutch. Integration of the Turbo gear set and ring gear/pinion shaft with shorter constant ratio in 991 PDK and Carbon synchronizers adopted from 991 Turbo.
Seems to be a bit of a different animal then the 991.1. From what I can tell 991.1 Carrera cars were closer in kin to the 997.2 Carrera cars where the 991.2 adopted more stuff from the Turbo family (by model designation) when it comes to driveline durability. Fine by me given how well its held up for the Turbo folks and they are dealing with 100-150 additional ponies and torque.
I did quite a bit of digging with several clutch manufacturers and no one makes an aftermarket clutch for the 991.2.
I had thought the stock clutch would be a Sachs, but not so.
I was worried about adding significant power and torque through a tune and looked for a stronger clutch with additional clamping power. Nothing.
The 991.1 has a completely different clutch setup and there are quite a few options available.
My buddy converted his 997.2 GT3 from a dual-mass flywheel to the RS 4.0 single-mass flywheel. The car is easier to stall now and has more vibration, but it made the car more fun and snappier. Makes the car feel more race car-ish if that's what you want. He has put about 30k on it since installation and the car is only driven spiritedly.
Last edited by AdamSanta85; 03-24-2022 at 10:40 AM.
My buddy converted his 997.2 GT3 from a dual-mass flywheel to the RS 4.0 single-mass flywheel. The car is easier to stall now and has more vibration, but it made the car more fun and snappier. Makes the car feel more race car-ish if that's what you want. He has put about 30k on it since installation and the car is only driven spiritedly.
I don't want to be the Guinea pig on our platform LOL I was hoping someone here has done this mod already. I guess if it ain't broke, I don't need to be the one breaking it.
I purchased a ‘92 964 cab that had the headers, intake and single mass flywheel. It does run faster (haven’t had it dynoed) but it stalls at different times. I’m thinking of putting a dual mass back on because I NEVER had an issue with my other 964’s. Don’t do it!
I did quite a bit of digging with several clutch manufacturers and no one makes an aftermarket clutch for the 991.2.
I had thought the stock clutch would be a Sachs, but not so.
There is a company called Ninemeister that makes a LWFW for 718 9A2. I wonder if it would work for 991.2, guessing no because of the pattern for the clutch cover
I do not plan to put a LWF in my 991.1, but also put one in my 964 - for me, the 964 was insanely better with the LWF! Of course, it was accompanied by an extreme build including pistons and heads from Rennlister Ninemeister in the UK and custom cams... YMMV
Last edited by browse964; 02-21-2024 at 09:53 PM.
Reason: fix typo
I just got off the phone with Jordan at Aasco and talk through the 991 LWFW. I asked about harmonics in regards to replacing the Dual Mass and he said that on the 9A1 motor that's not an issue. He did say you do lose some dampening because you don't have the springs in the flywheel to take the drivetrain shock. But hasn't seen any damage to cranks due to their flywheel.
This will be my next major upgrade, I'll keep you guys posted as I muster the dollars and courage to try this LOL.
The kits is $2600 + labor. My guess is that the labor will be at least $1,000-$2,000 depending on the shop.
If anyone has recommendations in the LA area to do this, please let me know!
I just got off the phone with Jordan at Aasco and talk through the 991 LWFW. I asked about harmonics in regards to replacing the Dual Mass and he said that on the 9A1 motor that's not an issue. He did say you do lose some dampening because you don't have the springs in the flywheel to take the drivetrain shock. But hasn't seen any damage to cranks due to their flywheel.
This will be my next major upgrade, I'll keep you guys posted as I muster the dollars and courage to try this LOL.
The kits is $2600 + labor. My guess is that the labor will be at least $1,000-$2,000 depending on the shop.
If anyone has recommendations in the LA area to do this, please let me know!
Ive never done it on a Porsche but have had LWFW on Japanese tuner cars back in the day, it was always a good thing for me.
Neinmeister has a clutch and flywheel combo for 991.1 too
I don't think the upgrade is about handling more power, but rather having a more responsive motor Especially in the 991.1
oh i get that part, just the way they are upselling the second part of the kit (clutch) is misleading i think.
I would love to get this for a simit more response out of the engine but have reservations about crank bearings going when removing the weight that would typically dampen vibrations.
oh i get that part, just the way they are upselling the second part of the kit (clutch) is misleading i think.
I would love to get this for a simit more response out of the engine but have reservations about crank bearings going when removing the weight that would typically dampen vibrations.
I had this concern too but gt4 guys have been running this and I contacted aasco directly and they have yet to have any resonance or crank failures due to the LWFW.
03-24-2022, 10:29 AM
this upgrade may have to wait.
