View Single Post
      01-27-2013, 03:27 PM   #112
Black Gold
Major General

Drives: M3
Join Date: Oct 2010
Location: Texas

iTrader: (15)

Originally Posted by bruce.augenstein@comcast. View Post
Perhaps a nit, but chassis dynos don't measure torque. They directly measure power thru acceleration of a known mass (with a known rotational inertia) at known speeds.

Proof point: If you don't hook up a sensor to a plug wire to get rpm, you'll still get a power curve, but no torque curve. Getting rpm means you can then calculate the torque curve.

Running the rollers in differing gears will get you similar results, because greater acceleration of the rollers in, say, first gear is offset by that happening at lower speeds - in a proportional way.

Fair enough, and good info.

Regardless, for the purposes of a discussion of relative tq between cars, i accept the calculated tq values from a dyno to be adequate