the rollar has a brake to put resistence against it to simulate weight and the wind resistence is calculated into the computer program..
you can pick this apart if it entertains you to do so.. we use it to get a close idea of what the vehicle will do at the track in real time..if it does it on the dyno you SHOULD be able to get to that on the track too..unfortunately the dyno can not calculate for driver ability.. not that it is all that hard to take a Lightning down the track.. you pretty much do a burn out and point and shoot..if I can do it.. you all should look like pros
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