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| The ACT Prolite flywheel is made of lightweight forged heat treated chrome moly steel. It has a lot of milling to reduce weight. It is also resurfaceable. |
The ACT clutch disc also has a sprung hub. The sprung hub helps with engagement smoothness and cushions the drivetrain from shock especially when dumping the clutch or shifting fast. The stock hub is somewhat weak and tends to crack allowing the springs to fall out and jam up the clutch. The ACT hub is much stronger in this area.
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| The back side of the ACT flywheel is all hollowed out for less weight. The flywheel is one piece and the starter ring and OBDII signal generator all all machined into the material. This one piece construction is pretty cool! |
The clutch disc also has a marcel spring. The marcel spring is a flat spring that is riveted under the friction material that compresses flat as the clutch engages. This gives a more gradual engagement and allows the driver to start smoothly without grabbyness and stalling. These features allow the clutch to hold up under track use and still be as easy as stock to daily drive.
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| Some detail work of the intricate CNC milling of the lightening holes, the sensor ring and starter gear. |
We ordered the clutch as a kit from ACT which also included a new throwout bearing, pilot bearing and a handy clutch alignment tool to ease installation. It is easy to change these parts while the tranny is off so why not. As a note for safety, the ACT clutch is also SFI certified which means it has to pass grueling high rpm spin testing.
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| The stock two piece flywheel is just like the ones found on diesel motors and just about as heavy. It weighs 29 lbs. |
To make the car more responsive we ditched the stock flywheel and installed ACT’s XACT Prolite flywheel. ACT flywheels are one piece steel machined from chrome-moly forgings. Chrome Moly is a steel alloy with a high chromium and molybdenum content. This makes a steel alloy with nearly twice the tensile strength per weight as regular high carbon steel. Forging is also cool as it orients the metal’s grain for best strength. It also works the metal and refines the grain which gives additional strength.
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| Lots of heavy metal. |
