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March 30, 2011

DESC410R – Slipper Setting

Filed under: Tricks and Tips — Tags: — Stuart @ 8:56 am

The DESC410R comes equipped with a slipper clutch to protect the drivetrain from high loads and shocks from landing jumps.  With proper build technique the gearboxes should be tough but setting the slipper is a vital part in the process of preparing your vehicle for the punishment of the race track.

TTT-Slipper-parts The DESC410R slipper unit in unassembled form

The slipper works by clamping two fibre-pads, one either side of the spur gear – and by varying the clamping force applied you can change at what point things start to slip.  An ideal setting is one that will allow the vehicle to accelerate quickly whilst minimizing front wheel-lift (wheelies!) and protect the drivetrain from harsh impacts.

ttt-slipper-pads ttt-slipper-padson
ttt-slipper-spring On the DESC410R the slipper is set with a nut clamping down a heavy duty steel spring.  A second nut is used to effectively lock the setting and prevent things from coming loose.

We’ve found a good base setting to be 3mm between the bottom of the first nut and the face of the bearing that sits against the slipper plate.  From this point you can adjust and find a setting that suits your setup and track conditions.

ttt-slipper-measure2 ttt-slipper-measure
ttt-slipper-test You should be able to hold the diff-casing between the fingers of one hand and turn the spur gear with the other.   If it’s very hard to turn then loosen things off – you can always play with the setting in the car to adjust it.  If you tighten things too much you could damage the drivetrain as a result of an ineffective slipper.

Holding the body of the slipper unit in your hand you need to lock the first nut in place so as not to change the setting whilst locking things up.  You can position one of the included wrenches around the lower nut and clamp it with your thumb – then using the second wrench carefully tighten the top nut against the first to lock the two in position.

ttt-slipper-tighten ttt-slipper-nuts

A good test of your slipper is to place the vehicle on a very high traction surface and accelerate hard – you want the slipper to slip for the first few feet instead of the front end elevating.  You should be able to feel & hear when the slipper is doing its job.  It’s best to start loose and tighten up as required rather than risk damaging the drivetrain.

If you choose, you can purchase the centre diff option parts (#TD210031) to run a centre differential to help put the power down on bumpy / loose surfaces.  The centre diff will absorb some impact and help the slipper protect the rest of the drivetrain but don’t assume the centre slipper will protect the drivetrain properly on its own – you still need to use the slipper.  It can be harder to set the slipper and test the setting when using in combination with the centre diff so measuring the setting might be the best way of getting things set right.


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