WRX STi vs Duramax
- Thread starter IGOTASTi
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- pulling sti vs duramax video
Grinder34
Track Monkey
hah. But to bring some science to the mix, the STI was at a HUGE disadvantage spinning his wheels.
Depending on exact tires, his coefficient of friction with rolling (not spinning) wheels is probably close to 1.0. But spinning, he's down probably 40% to a .6 The Duramax probably has less grippy tires. So his not-spinning coefficient of friction is maybe only .7, which is still greater than the .6 of the subaru's spinning wheels. But if he starts spinning his wheels, his coefficient of friction goes down 40% to only .4 (way less than the 1.0 of the Subaru without spinning wheels).
So Fs = usFn. (Friction Force = Coefficient of Friction * Normal Force (weight))
Subaru (No Slip)
Fs = 1.0*3300 lbs = 3300 lbs
Subaru (Slip)
Fs = 0.6*3000 lbs = 1980 lbs
Duramax (no Slip)
Fs = .7*8000 lbs = 5600 lbs
Duramax (Slip)
Fs = .4*8000 lbs = 3200 lbs
It's possible that the roles could've been reversed. A duramax with spinning wheels with the subaru pulling it away.
But that would probably require the duramax to start spinning his wheels first. And my rough coefficient of friction numbers to be accurate.
Still, food for thought!
Depending on exact tires, his coefficient of friction with rolling (not spinning) wheels is probably close to 1.0. But spinning, he's down probably 40% to a .6 The Duramax probably has less grippy tires. So his not-spinning coefficient of friction is maybe only .7, which is still greater than the .6 of the subaru's spinning wheels. But if he starts spinning his wheels, his coefficient of friction goes down 40% to only .4 (way less than the 1.0 of the Subaru without spinning wheels).
So Fs = usFn. (Friction Force = Coefficient of Friction * Normal Force (weight))
Subaru (No Slip)
Fs = 1.0*3300 lbs = 3300 lbs
Subaru (Slip)
Fs = 0.6*3000 lbs = 1980 lbs
Duramax (no Slip)
Fs = .7*8000 lbs = 5600 lbs
Duramax (Slip)
Fs = .4*8000 lbs = 3200 lbs
It's possible that the roles could've been reversed. A duramax with spinning wheels with the subaru pulling it away.
But that would probably require the duramax to start spinning his wheels first. And my rough coefficient of friction numbers to be accurate.
Still, food for thought!
Last edited:
War_Panda04
STill Plays With Toys!
i love the science you put to that!!