What's the difference between those two? It seems there's a big difference between those two dyno test equipment in calculating power and I think the mustang dyno provide us little horsepower though than dynojet test equipment. Please help me on finding a true horsepower on my car.

 

You'll probably never find a true horsepower reading unless you use an engine dyno. Chassis dynos can only really be compared to other runs with the same car on the same dyno. Usually they're consistant between manufacturers and models of dyno, but it's virtually impossible to convert dynojet to mustang to dynapack to dyno dynamics. The mustang dyno can do loading. The Dynojet can probably only do power based on how quickly you can accelerate the rollers (though they do have a new eddy current loading dyno).

Tim