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OK, you wanna get physics, lets get physics.
Hemi: Fk=rolling resistance, air resistance, vibration and loss of heat, gravity, and misc...
Box: Fk=rolling resistance, air resistance, vibration and loss of heat, gravity, and misc...
So, the 225's on the hemi will have a little less resistance than the boxsters wider tires (and probably stickier compound), air resistance will be more for the hemi, boxster is engineered better so im assuming the big v8 is inefficient, hemi weighs more, and the suspension is probably softer.
lets take generic percents to calculate:
Hemi=(.02)+(.3)+(.1)+(.4)+(.01)=.83
Box=(.025)+(.2)+(.08)+(.28)+(.01)=.595
So roughly a 23% difference and there is a 25% difference in power. So I dont know, im sure my numbers are crazy but I was trying to make it relative to each other. You can add on to that or change it.
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