Hi,
First post and yes, I did do a search and found lots of discussions about torque steer, torque vectoring and the 85Ds impressive 864 ft-lbs of toruqe but nothing that explains this:
The Model S electric motor makes 443 ft-lbs of torque at 0 RPM, right? That's driven through a 9.7:1 gear reduction, meaning that the Tesla has 4,297 ft-lbs of torque available at both wheels. Yet, even the 85D with 2 motors only shows up on a dyno as having 864 ft-lbs of torque. I thought maybe the wheel and tire acts like a gear but with a 1" shaft and a 30" diamter wheel, that would mean only 143 ft-lbs of torque at the point of contact between the tire and the road. Ok, there's 2 tires so that equals 286 ft-lbs but that's still no where near the 864 ft-lb dyno result.
Would someone please school me as to how much torque is available from the motor right through to the wheel and why these results aren't showing up on any dyno?
Thanks,
Rob
First post and yes, I did do a search and found lots of discussions about torque steer, torque vectoring and the 85Ds impressive 864 ft-lbs of toruqe but nothing that explains this:
The Model S electric motor makes 443 ft-lbs of torque at 0 RPM, right? That's driven through a 9.7:1 gear reduction, meaning that the Tesla has 4,297 ft-lbs of torque available at both wheels. Yet, even the 85D with 2 motors only shows up on a dyno as having 864 ft-lbs of torque. I thought maybe the wheel and tire acts like a gear but with a 1" shaft and a 30" diamter wheel, that would mean only 143 ft-lbs of torque at the point of contact between the tire and the road. Ok, there's 2 tires so that equals 286 ft-lbs but that's still no where near the 864 ft-lb dyno result.
Would someone please school me as to how much torque is available from the motor right through to the wheel and why these results aren't showing up on any dyno?
Thanks,
Rob