2wd gearing & slipper question.

[butters86]

Hi All,
I've just swapped my brushed 12/4 motor and LRP speedo for a Turnigy 9.5T Sensored Brushless & Hobbyking 120A speedo.

It seems ridiculously quick at accelerating but has topped out by the end of a 10m long garden. After a 10 mins+ run on grass the batteries where cool as was the motor.

I can't help but think I could get more speed but not sacrifice much acceleration by changing the gearing.

I currently have an Ansmann Madrat. I've upgraded the 28T gear in the gearbox for a metal one from a HPI Firestorm so in theory the gearbox can take more abuse. The Spur gear is the stock which I believe is 80T? The differential gear is also stock 52T I think. The pinion I have fitted is an 18T HPI one.

So what would people recommend going to on the pinion? I think it has 21T stock but it was making my old brushed setup work too hard.

Also what is best practice/ what is the purpose of the slipper setup on the spur gear? At the moment it's just about fully tightened.