Despre TRANSMISIE

This section deals with upgrades relating to 'Manual' transmission systems only.

The Clutch

If the engine power is to be increased by 15-20% or more then a heavy duty 'road spec' clutch should seriously be considered.

This type of clutch is a direct replacement so no modifications are required. Because it has an increased pressure rating the effort required to depress the clutch pedal will also increase.

For serious road/rally applications the conventional 'organic' material clutch plate can be substituted for a 'cerametallic' paddle plate. The durability and grip of a cerametallic plate far exceeds the conventional plate but some degree of clutch 'feel' will be sacrificed, together with a level of clutch vibration, when engaging.

Lastly, for competition use only, single or multi-plate race clutches are available for a large range of applications. Special steel flywheels are required for all race clutches.

The Gearbox

More engine power = more torque = higher loadings on gear teeth and bearings + take-up shock from competition clutches = broken gearbox!

Most standard gearboxes will cope with a moderate increase in 'abuse' but there is a limit. If you have an old 4 speed set up, the chances are there is a stronger 5 speed box available which, with the right bellhousing and mountings, will be an ideal replacement. For faster more positive gear changing, quick shift levers and kits are available for many of the more popular gearbox types. Uprated internals together with alternative gear ratio kits are available for a selected range of O.E. and special equipment gearboxes.

The final drive

For serious competition use it may be necessary to change the differential ratios to suit circuit variations. Special attention should be paid to drive shafts which are a specific weakness on most cars. And lastly, to achieve maximum traction from the driving wheels a limited slip differential unit (LSD) is a must for all competition cars.