04-05-2005, 03:45 PM
Kinda late in the discussion, but for a dyno to be truly useful for tuning it has to be a loading dyno (edy current, water brake, etc) and not an inertial dyno (mustangs??? I dunno).
Inertial can give u numbers, but it can't provide a constant load to help you turn anything but WOT. It calculates HP/TQ by seeing how quickly the motor can spin up a known fixed rotating mass.
The loading dyno basically provides a varying resistance by either using a brake or having the wheels turn some type of generator and then apply a resistive load. This has the advantage of being able to provide a constant load on the car. The former does not.
The latter allows for datalogging and tuning across all rpm/throttle combinations, much like driving down the road.
Inertial can give u numbers, but it can't provide a constant load to help you turn anything but WOT. It calculates HP/TQ by seeing how quickly the motor can spin up a known fixed rotating mass.
The loading dyno basically provides a varying resistance by either using a brake or having the wheels turn some type of generator and then apply a resistive load. This has the advantage of being able to provide a constant load on the car. The former does not.
The latter allows for datalogging and tuning across all rpm/throttle combinations, much like driving down the road.
I feel more like i do now than I did before.