NOTE for 6speed models only. NOT FOR PDK
With our single mass (Light Weight) flywheel kit, you get considerably better acceleration resulting from less rotational mass (especially in lower gears). Porsche does the very same thing with the manual GT3RS (2007-2012) to give it an edge over the standard GT3 models. Upgrading to a lightweight flywheel from dual-mass helps overcome the engine's feeling lethargic or lazy, and this upgrade greatly improves the overall response of the engine to throttle input.
The dual-mass (or "twin mass") flywheel that our lightweight unit replaces comes standard on the 6 speed 997.2. It is effectively two flywheels in one, coupled in a way that allows the two flywheels to rotate relative to each other in a range up to 15 degrees, but with a small amount of resistance to this movement. This movement and the inertia/resistance of the mechanism and mass of the flywheels was designed to cushioning the power pulse variation that can cause gear rattle. This was more noticeably the case on 996 models than 997s. Dual-mass flywheels use a simple solid-center clutch disk. It is more difficult to change the speed of the dual-mass flywheel, whether accelerating it or slowing it down, which means besides inhibiting engine acceleration to some degree, it also inhibits the deceleration that occurs between every power pulse.
A single-mass flywheel is a one-piece, rigid disk of metal, either aluminum or steel. Our flywheel also comes with new flywheel bolts for installation. The weight difference is significant with the stock dual-mass weighing in at 28.5 pounds vs. our single -mass piece at 14.3 pounds.
We also provide an upgraded sport clutch disk, sport pressure plate, and release bearing assembly to handle more power and torque than the original unit. As an added bonus the clutch pedal feel is actually slightly "lighter" than factory.
Complete SharkWerks LWF and Clutch Assembly (left) vs Stock (right)
We have used our light weight flywheel kits over the years on our own shop R&D cars and personal cars including the 996, 997, 987 Cayman S and of course our GT4. In essence we don't feel at home in a naturally aspirated engine without our light-weight flywheel treatment!
After the car warms up and at idle there is some additional rattle/noise from the transmission. This is not very noticeable like on other cars, but it is normal and similar in principle to that found on the 997 GT3RS.