Discussion
Slippydiff said:
Benefits : Improves the throttle response in the lower gears, makes heel and toe downshifts more rewarding.
Downsides: Can make driving in heavy traffic trickier. A lot more transmission noise when hot.
Summation : Definitely not Snake oil
Thats what I wanted to hear. The servicing bill for this car just keeps getting higher 😫 Downsides: Can make driving in heavy traffic trickier. A lot more transmission noise when hot.
Summation : Definitely not Snake oil
Does the 996 GT3 have anti-stall? I don’t know how different the 996 is from 997, but with the 997 GT3 the anti-stall still works as normal, so everyday drivability is unaffected by fitting a LWFW. So for instance I’m still able to manoeuvre around at low speed without using the throttle just by lifting the clutch in and out. Not what I was expecting as “everybody” (The Internet) was telling me I’d stall all the time which is just not true
I’d generally agree with Slippy on the points he raises though. It’s a great mod, but for me it was one of those “while you’re in there” kinda mods, I’m on the fence if it’s worth the expense as a standalone mod but that’s just due to the costs - money no object sure I’d do it without doubt I don’t see any disadvantages. You’ll save a lot of weight too, at least on the 997.1 GT3 the weight saving is around 15kg off the crank from memory (can’t remember the exact numbers)
I’d generally agree with Slippy on the points he raises though. It’s a great mod, but for me it was one of those “while you’re in there” kinda mods, I’m on the fence if it’s worth the expense as a standalone mod but that’s just due to the costs - money no object sure I’d do it without doubt I don’t see any disadvantages. You’ll save a lot of weight too, at least on the 997.1 GT3 the weight saving is around 15kg off the crank from memory (can’t remember the exact numbers)
Edited by rrroro on Friday 13th August 06:39
Another thing I like about the LWFW (only had mine fitted last month btw) is it makes rev matching more predictable as I no longer have to stamp on the throttle to get the engine speed to increase, paradoxically the car feels a bit more civilised generally than it did with the heavier flywheel
Edited by rrroro on Friday 13th August 06:45
Stalling/idle problems after the fitment of an RS flywheel could be an issue on the 964, and to a lesser degree the 993, but I’ve never heard of issues with the 996 GT3.
Stalling problems are more likely to be the result of the new clutch being fierce rather than any inherent issues with car’s idle stability control, and they’ll lessen as the new clutch beds in and the driver adapts accordingly.
As you’ve mentioned, once the clutch has bedded in, it should be possible to move off from a standstill without touching the throttle.
I agree totally on the heel and toe/rev matching comment, definitely more pleasant and rewarding.
Stalling problems are more likely to be the result of the new clutch being fierce rather than any inherent issues with car’s idle stability control, and they’ll lessen as the new clutch beds in and the driver adapts accordingly.
As you’ve mentioned, once the clutch has bedded in, it should be possible to move off from a standstill without touching the throttle.
I agree totally on the heel and toe/rev matching comment, definitely more pleasant and rewarding.
Edited by Slippydiff on Friday 13th August 06:51
Digga said:
From all I hear it is definitely worth it. As you say, whether 996 or 997, dealing with the pulley/damper too is essential to avoid crankshaft resonance.
Mk1 993 GT3 Clubsport was supplied with a LWF OE, and no alternative crank pulley was specified (IIRC) The GT3 RS crank pulley can be used on the Mk2 996 GT3. As for the new fangled 997 iterations, I can't remember, but I recall there are various aftermarket solutions ?
rrroro said:
... You’ll save a lot of weight too, at least on the 997.1 GT3 the weight saving is around 15kg off the crank from memory (can’t remember the exact numbers)
Wow, that is a lot!It would help explain why I find H&T more difficult to do properly in mine, compared to older cars I've had (albeit with smaller engines and less intertia, and more responsive throttles...).
braddo said:
rrroro said:
... You’ll save a lot of weight too, at least on the 997.1 GT3 the weight saving is around 15kg off the crank from memory (can’t remember the exact numbers)
Wow, that is a lot!It would help explain why I find H&T more difficult to do properly in mine, compared to older cars I've had (albeit with smaller engines and less intertia, and more responsive throttles...).
The Gen 2 997 GT3RS flywheel is 3lbs (1.3kg) lighter still.
If you go with the latter, 8kg is still an impressively big chunk of weight to lose from the rotating mass of an engine.
Definitely worth it - I have a Cup flywheel and clutch kit in mine. The IC map is good enough to prevent stalling so I can leave the traffic lights without touching the gas pedal. In addition, it makes the Mezger rev like a motobike... Last but not least, if you are to re-map the engine, the LWFW allows for more aggresive ignition advance map, which should give you a better shove mid to high rpm...
Slippydiff said:
braddo said:
rrroro said:
... You’ll save a lot of weight too, at least on the 997.1 GT3 the weight saving is around 15kg off the crank from memory (can’t remember the exact numbers)
Wow, that is a lot!It would help explain why I find H&T more difficult to do properly in mine, compared to older cars I've had (albeit with smaller engines and less intertia, and more responsive throttles...).
The Gen 2 997 GT3RS flywheel is 3lbs (1.3kg) lighter still.
If you go with the latter, 8kg is still an impressively big chunk of weight to lose from the rotating mass of an engine.
rrroro said:
Cheers for the correction Slippy! Someone told me recently the 964 RS flywheel was only around 1.5kg so thats the source of my dodgy weight saving claim, shouldn't believe everything I hear
Now that would make for an interesting drive on the road !! 
As I understand it, the 997.2 GT3 RS flywheel is the actually the late 996 Cup car item, so pretty light by road car standards. The 997 Cup car used a sequential dog 'box and clutch that was about 7-8" diameter, so the flywheel was tiny and even lighter ...
Slippydiff said:
northerner said:
Is there any difference between the 964RS version and the 996 cup/997 GT3 RS lwfw?
The late 996 Cup car and 997 Gen 2 GT3 RS's LWTF ? Yes, they're about 1.5 kgs lighter than the 964 RS item.Full about heel performed and gone for the 964 rs version.
Have been advised by Michael at Sports & Classic that the 996 Cup and 997.2 gt3 rs versions have been seen with stress fractures, potentially due the additional material that has been taken off.
I trust Michael so 964rs flywheel it is. Next decision, M&M full exhaust system or something more track friendly 🤔
Have been advised by Michael at Sports & Classic that the 996 Cup and 997.2 gt3 rs versions have been seen with stress fractures, potentially due the additional material that has been taken off.
I trust Michael so 964rs flywheel it is. Next decision, M&M full exhaust system or something more track friendly 🤔
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