Discussion and questions related to the course Practical Dyno Tuning
Hi Guys, Ive heard alot from people about how different tyres can change the peak power on a ramp run. Im talking about motorcycles but i dont see why a car should be different. Tyres of the same size but different compounds ie. soft or hard slicks. Assuming there is no tyre slip - can the compound change the readings?
Of course it will change the parasitic drag. I would say sidewall construction would have a bigger impact than the compound alone but it will still have an effect. Tires dont just work off a typical coefficient of friction type physic (F=uN), there is actually also a significant chemical bonding effect between the tire and the surface it rolls on. Think of of it like you are trying to peal duct tape off your dyno roller at 100mph... There are also a hundred other factors at play such as tire size, pressure, temperature, how tight you tie it down, contact patch, roll diameter, wheel alignment etc...
Ive had a front wheel drive race car with about 4deg -ve camber that could barely even turn the rolls (no load) due to the toe and chamber causing an extreme scubbing effect between the front and back rolls.
Ok it's for bicycle tyres (where single digit Watts count!) but the same principles relating to tyre width, case construction, tread compound and tread depth applies -