Yokomo YZ-4

[neallewis]

Originally Posted by badger5

The press release comments on the desire for small diffs, I presume this is to reduce rotating mass and inertia but how will this make the car easier to drive? Surely the wheels and tyres will have a far bigger influence on rotating mass and inertia, will we see lightweight wheels/tyres/inserts in the future? Or do the diffs have a different influence?

This is to reduce the distance between the centre of the out drive and the lowest point on bottom of chassis, so roll centre adjustment. The issues with the Bmax4 roll centres, height of outdrives, and requirements for a high roll stiffness (thick antiroll bars and stiff springs) are limiting to the setup. This is because of the size of the diff casing and crown gear sets the minimum height the geometry has to be. Reduce the diff size, and rotating mass of the diffs, and it solves the issue. I've discussed this with Shin and Lee when trying to address handling characteristics of the bmax4iii
I suspect the yz4 will use regular bmax2/yz2 gear and ball diffs as the diameter of the diff casing is ideal.