[ItBites]

A fellow named Tim runs XACT. His is a real fluid dyno, so none of the problems inertia drums create wrt spin-up rate. His dyno bolts to the hub, so no tire spin on big power cars, resulting in errors. No tie downs and sand bags for weight/traction needed. I wouldn't trust an inertial dyno, unless I had no other local option. Tim has a weather station built-in for true SAE corrections. He's also a real sharp tuner who found I make the same power at 28 deg advance that I get at 32, 34, or 36, so we backed the timing to where I'll never detonate! He can handle the power from any of the local Cobras; he tuned mine to 540 rwhp in 2 hrs. The thing that was really cool was that he could set in the computer the time to ramp from 3000 to 6000 rpm (we used 6 sec) and just floor it, the computer on the dyno controlled the load to linearly ramp the rpms up. Not like the old days!