New Constant Velocity Driveshafts


“Following from successful testing Litemodz are proud to release the new CVS Constant Velocity driveShaft designed for the high level racing. The new shaft provides constant velocity equalising input and output shaft speeds reduces wheel vibration to a minimum providing a much smoother transmission increasing steering and overall grip levels on the car by reducing unwanted tyre scrub. Using the CVS in both the front and rear of the car provides a more stable and precise car that is easier to drive with the added benefit of improving transmission wind up and tyre wear. The potential benefit of running constant velocity drive shafts can be seen when looking at the standard UJ.

Theoretically a motor spinning at 40000 rpm with a gear ratio of 7 to 1 will produce a wheel speed of 5714 rpm. At zero angle this will remain at 5714rpm. However introduce angle into the joint and it begins to fluctuate. It is common to run with the drive shafts with some angle given the ride height to diff height toe angle and camber. At 30 degrees (front) the speed fluctuation will be approximately 29% giving an actual speed fluctuation of: 1657 rpm which occurs twice per revolution in both directions.

This can produce excessive tyre wear and load the transmission wearing drive shafts, cups, pulleys and belts. At the same time the rear of the car will also produce some results. Assuming 3 degrees toe in and a shaft operating angle of some 10 degrees there will be an approximate speed fluctuation of 3 %. That is +/- 171 rpm again in both directions. Since the suspension on the car is relatively soft every time that car leans in a corner the speed fluctuation is increased maybe up to as much as 12% assuming the angle is now operating at close to 20 degrees. This is as much as 685 rpm. With CVS this is pretty much eliminated. The new CVS which is due to go on sale at the beginning of August will be available for Touring cars initially, then extended to 1/10th Buggies by the end of the month then 1/8th Scale a month later. The initial touring cars covered are:

  • Schumacher Mi4
  • Tamiya 416X
  • Xray T3
  • Corally Phi
  • Top Photon
  • Cyclone TC
  • Cyclone TCX
  • Yokomo BD5
  • Associated TC5

More details can be found at from Sunday the 1st of August!”