[Barry_R]

I've gone from dyno to dyno with the same engine numerous times doing the Engine Masters deal. They are both always DTS units, and have never read the same - whether going from Detroit to New York or to Ohio.

Simply too many variables involved. Some of the variables are obviously in the engine, but others involve the dyno room setup (intake, exhaust, air handling) and the calibration of the software (there are several rates of acceleration, temperature and air compensation standards to choose from).

The dyno is a directional tool as opposed to an absolute - unless you hold all the variables under control - same cell, same software settings. Very similar to a flowbench, where I can get heads here that flow a certain number and improve upon them - while still being lower but outpowering some other heads that flowed more on the internet somewhere. Some head characteristics do not show up on a flow bench but make a pretty big difference in the engine - such as combustion chamber design.

You will learn more in a day on the dyno than you can learn in a half dozen track days.