KP Designs - Limited Slip Differential for FG & HARM

Hydraulic Brakes

Alloy Wishbones

Front Suspension

Rear Suspension

Differentials

© KP Designs 2001

Limited Slip Differentials for FG & HARM

KPD098 & KPD099 (for F1) These new diffs. code named the F40 have been developed over the past 18months. After numerous prototypes, and many technical problems, the F40 diff. in its production form was used at the European Championships by Kev Murby, to take him to second place. Kev. quotes "I could not have done it without the new differential. It has proved to give me a 1/2 second per lap advantage on all the tracks I have tested it". Also available is KPD100 which is a DIY kit to convert a KPD009 or 10 diff with double clutches to the latest F40 type.
The new differential uses twin cone clutches running steel to a special grade of Ferodo to give a diff with tremendous drive out of the corner but with very easy driving and complete freedom for entry into the corners. It does not contain oil, so there is no leakage problem. It does not need to be adjusted as its operation is torque sensitive and only stiffens if the traction allows the power to be put down. It uses standard FG plug in drive cups and is available with either the standard gear drive for most cars or the pulley drive for the F1 cars. Spare Ferodo linings and other spares are readily available. Also available is a special mandrel to enable the clutch end float to be set.
KPD098d Micrometer mandrel to set the end float on the F40 differential. The action of the differential is dependant on the end float and this tool makes it simple to measure. Also works on all other diffs using the plug in drive shafts.

KPD009 & KP010 ( for F1) Manufactured to close tolerances using the best materials available, it remains completely free when no load is present, such as during tight cornering, yet stiffens quickly to transmit maximum power to both wheels when it is required. It was demonstrated with devastating effect at a Stuttgart meeting by Achim Bald, who passed through the speed trap at a higher velocity than any other competitor. The locking effect of the differential is achieved by the use of a multi-plate clutch, which consists of six ground steel plates running in an oil bath. The flexible design allows for the fitting a second six plate clutch to further increase the lock-up under load, as well as reducing the temperature build up encountered during extreme conditions. There are no internal screws to fail, as the output gears are manufactured as one piece units incorporating the output shafts.

The differential is designed to directly fit the FG & HARM cars, and now the FG F1 racing car, but can be fitted to the latest Laro car quite easily by modifying the layshaft and fitting the drive gear the opposite way round. The differential may be fitted to other brands of car if they can adapt the overall width across the ball races of 71mm. The differential is supplied as an assembled unit with a six plate clutch. A standard drive gear, drive cups and ball races are also included. Two grades of oil are also supplied, the thinner oil giving a harder locking action, especially in high speed cornering on high traction surfaces. Drive shafts are not supplied as these are an option to suit the car. Special drive shafts made of stainless steel are available for most models, as is an additional six plate clutch, which is recommended for very high traction conditions.