JM993

Hey Everyone,

I'm in the process of installing a LWF. Does anyone have experience with using a 4.0 GT3 RS clutch disc on a 993? I've read they potentially reduce the "marbles in a can" sound which is usually part of the LWF experience. Any negatives besides the price?

Thx
Joe

Rick-A-Shay

I may be "off base" here but IIR, there have been comments idle problems/stalling with the LWF in a 993 based on year..
Additionally, I have found, on my car (stock), power steering puts enough load on the engine at idle when turning and starting off, that's easy to kill the engine. Others may want to chime in here..... Maybe check this current thread: https://rennlist.com/forums/993-foru...-flywheel.html

JM993

Thanks. My question was more related to the 4.0 clutch disc. The LWF is definitely going in, I'm debating between the 4.0 disc and 996116015320 which is typically used.

swmic

With my motor rebuild, I installed the GT2/Turbo PP (996.116.027.51) and the disk you are asking about (996.116.015.32). I've only got around 150 miles on it so far and it works great, but is a bit stiff. Don't know if I'd like to daily drive it like this. I'm hoping it mellows out a bit with some miles. If it bothers me going forward, there is a slave cylinder replacement that is suppose to reduce the pedal effort by around 30%. Sorry I forget who makes it. I wouldn't discourage this combo, but just warn you the pedal is stiffer than stock.

I guess the marbles sound is reduced compared to my old disk/pp setup. It's still there, but I don't notice it as much. I was attributing the reduced noise to a fresh trans rebuild.

OverBoosted28

Joe, I've had the 4.0 since April of 15. Probably a half dozen track weekends, and numerous miles. Absolutely no complaints!!!!!

Carlos993

Please check with your mechanic, or better yet with Porsche, before doing this. I had bought a 4.0 RS LWF/Clutch set for my 997 GT3.1, others have had a good experience with the set-up. Dealer then warned me about it as there is a Porsche bulletin out that the RS 4.0 LFW/clutch disc on certain engines cause some bolts to loosen from the vibration, causing potentially catastrophic results. Issue rectified w 997 GT3.2 and above. You can search the 997 GT3 forum.

I have no idea if this is applicable to the 993.

On the 997 RS 4.0, that LWF and clutch is sweet.

esc911

I think the above information is a bit backwards. The bolts that were backing out were only happening on the .2 gt3 rs models and any regular .2 gt3s that had made the switch to lwf. This was supposedly due to some differences with the 3.8 motor. A harmonic damper supposedly helps. There weren't any reported issues with the .1 gt3 or gt3 rs running the lwf.

I have the 4.0 clutch and flywheel setup in my 997.1 and it is a fantastic upgrade over the stock dual mass. As for reducing the "marble in a can" effect in a 993, I'd say the rattling in the gt3 isn't all that different than the 993 lwf in my old 993 rs tribute.

Carlos993

The information came straight from my Porsche dealer, and I actually saw some document wrt the GT3.1. Cannot recall which document though and I do not have a copy.

But validated because they simply refused to make the mod on my GT3.1, however insistent I was, and they are usually cooperative on these matters.

Could well be applicable to the GT3.2 as well, however.

PiB993

What are the benefits of the 4.0 GT3 Clutch Disc? Is that it just more durable and handle more power than alternatives?


I simply wish the clutch would engage closer to the floor.

OverBoosted28

Yes, that's why I chose it. My stock clutch assm. was unable to handle the power. Was in pretty bad shape, not worn away, just the clamping force of PP was insufficient, and disc was also failing. The "764" high clamping PP, and 4.0 disc are designed for I think up to about 650 ft/lbs, so I knew it would be fine.

JM993

Thanks guys. Given my car is normally aspirated, I'll probably stick with 996116015320 instead of the 4.0 version. The only reason I was considering the 4.0 version was that I read some posts that it was quieter. But I'm not sure that this is really true.

Steve Weiner-Rennsport Systems

The noise comes from the gearbox. This is due to replacing the dual-mass FW with the single-mass LWF which lacks the damping features.

Such noises have nothing to do with the PP or disc.

nine9six

Unfortunately there is no adjustment for where the clutch engages and what you're experiencing is nothing more than clutch wear.
Install a new clutch and pressure plate and your engagement point will be closer to the floor.

esc911

I've seen the same document. It's just that based on forum feedback it's really the .2s where you see the issues. On the .1 as long as you get the matching rs pulley, supposedly no reported issues. 5k miles on my setup with a few track days and no issues. Let's hope it stays that way.

Sorry for the hijack OP.

enjoytheride

Has anyone followed through with a GT3 RS 4.0 clutch disc install? Is the correct part number for the disc 997.116.013.91 ( 99711601391 ) ?

I think I'd like to do an 964 RS Flywheel + 964 RS Pressure Plate + RS 4.0 Disc on my 1996 C2 unless anyone has a negative experience to share?