Project C7 Corvette Stingray Z51: Drivetrain Improvements

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The driveshaft in the torque tube has high-temperature rubber couplers in it, which is an upgrade if your C7 was made before 6/2/2015. After this date, all C7’s have the improved high-temperature parts.

It is a considerable amount of work to change the torque tube or the clutch, for that matter. So while we were in there, we decided to upgrade our clutch with one that will take any anticipated power modification we can dream up in the future.

The RXT 1200 is a twin disc clutch with the ability to have a decently smooth engagement, a light pedal effort and still contain up to 1200 hp. The RXT 1200 gets away with a light pedal because the twin clutch discs give the clutch twice the friction material area. The clutch diaphragm spring does not have to have seriously heavy clamping force to prevent slippage.

The pressure ring is thick nodular iron for good friction and low distortion, even when hot. The floater plate between the two discs is also thick for distortion-free heat capacity. The pressure plate sits on standoffs, so the clutch’s internals are fully exposed. This allows the cooling air to freely circulate and dust can be easily ejected.

The pressure plate has 2200 lbs of clamping force, which is plenty for a twin disc clutch to have a large torque capacity. Even with this generous amount of clamping force, the clutch has a 4-cylinder like pedal effort, thanks to the ratio of the diaphragm spring on the clutch cover.

A unique feature is that the floater plate is strap driven instead of the typical lug drive. This gives the floater good release separation and prevents it from rattling around. Because of this, the RXT 1200 should be quieter than a typical twin disc clutch, which usually has a characteristic rattle at idle.

The flywheel is a lightweight CNC-machined steel part. The friction surface is replaceable, as is the starter ring gear teeth, which help give the unit complete serviceability.