Originally Posted by
Chip
Another way of tricking the dyno dynamics that doesnt show up on the graph is to strap the car slightly looser so that in use it climbs onto the front roller only and hence removes the power losses driving the rear one apparently.
That is indeed true, it calculates the expected loss of rotating the rear roller. However, the correct way to run them varies, because a powerful car needs to climb the roller to get full traction as the vehicles weight starts to bear down on the roller centre line the more it climbs and with very high horsepower stuff you will never get traction without letting it climb so the only thing you can do is make sure that any tuning done the car climbs the same amount by correct installation and tension of the "Jesus straps"