https://docs.emtronaustralia.com.au/engine-management/config/vehicle/slip-calculation/index.htmlDrive Slip Given as a percentage of the difference between the speed of the driven wheel compared to the speed of an undriven wheel. The Drive Slip can be both positive and negative. Drive Slip = (Speed Channel 1 - Speed Channel 2) / Speed Channel 2 which is normally expressed as: Drive Slip = (Driven wheel speed - undriven wheel speed) / undriven wheel speedHugoen-us