kf v kr help grip roll
 

hi anyone how much difference between the kf and kr is, got a kr cheap for my son that are trying to use on a grass track but having major grip roll, I know the kr is for dirt/ low traction but what are the differences and how can dial out some grip, low staggers front spikes with outers cut off , both yellows .

I'm not expert, but I can share what I found with my SV2 which is not a rear motor car, but a rearwards motor car on high grip carpet..

With the SV2 on high grip carpet, it to was generating far too much rear traction causing it to grip roll. The immediate obvious solution was less grip on the front, but this kills performance so I found trimming a row of spikes on the rear helped (I was running yellow mini pin). 5 degree front C hubs also removed some of the immediate bite causing it to grip roll. Also ensuring the rear adjustable top links were as long as possible to reduce roll centre.

Also stuff like keeping the ride height as low as possible helps, along with harder front springs for the front if the terrain allows.

Fundamentally though, if we get a good summer and the grass starts burning out, your son will start becoming very competitive I think! Right now, with lush thick grass the KR is at a massive disadvantage.

Where does the grip roll occur in the corner?

Initial, mid or out?

what ride heights? lower the back end can reduce grip roll but depends how fast its rolling and what point in corner. springs/oil could be too soft