Belt drive chassis - slipping belt under hard braking?

[c_a_r_t_e_r]

Hi All,

Built my first belt drive chassis a little while ago, the bargain TA04-SS Audi TT - most excellent! Have built loads of Tamiya kits over the years, it all went together smoothly.

It runs really well with no slip under hard accelleration - my problem is when braking really hard.

I'm running a 9T ezRun brushless motor and ESC with LiPo, so it's pretty rapid - but slamming on the brakes from speed (reverse isn't being engaged) causes a soft clicking type noise - I'm pretty sure the belt is hopping a few teeth as the forward momentum of the car forces the tyres round against the resistance of the motor.

I would expect the tyres to lock up before the belt gives way? That's certainly the way it works on my other shaft-drive chassis.

Tensioners are all tight as per the instructions, has bevel gears in the diffs so it can't be a ball-diff problem either. No sign of wear on the drive cups, it's only had 2 packs run through it so far.

Any thoughts would be welcome!

Cheers,

Tim.

[digitrc]

It's not unusual for the belts to skip under braking. Adjusting belt tension should make a difference, although don't go so tight that it effects the drivetrain.