Re: Today's Dyno Run
From the information on the site that Woody gave the link for, it appears that the MAHA is an absorption type - these do tend to give lower numbers than an inertial type.
From my OJT experience, the inertial dynos use a drum of known mass. The vehicle accelerates the drum and the time it takes is monitored via microprocessors, equations applied, and voila, torque & HP numbers appear. DynoJet is a common unit of this sort. the absorption type use some sort of variable load (electric, water, etc) so the engine can be tested at a given rpm. The Mustang dyno is fairly common over here in the US, and it too produces lower (some say more accurate) numbers then the DynoJet.
I'm not familiar with the Dyno Dynamics either, but from their website, it appears to be an absorption type as they talk about holding rpm constant - which you can't do with an inertial unit.
Obviously, the biggest thing is using the same one for back to back comparison of changes.
Unfortunately, all of the cars I have experience with do not have as complicated an ABS system as the xfire does (both Miata & SHO ABS didn't bat an eye when one end of the thing was going 130 & the other zero). As I intend to modify my crossfire at some point, I am very interested in how the rear signal feed to the front sensors works out.
Henry