Test Results

What's A Dynojet?Dynojets are installed either in- or above-ground. The Dynojet software measures how quickly the car accelerates the rollers and determines power and torque output. It can accurately diagnose performance or driveability problems from 20 to 1,200 horsepower at the drive wheels. Dyno runs can be done at speeds up to 200 mph, providing safe, reliable testing in the shop.

Baseline Test NumbersThe results of this test were in the ballpark, especially when you take factory '99 Cobra and '01 Bullitt ratings into consideration. If you take the usual accepted average of a 15-20 percent loss in power due to the parasitic drag of drivetrain components, then you see that the numbers for 347 in the '90 LX are pretty accurate. In short, the reason the Cobra's percentage losses are more than average is because '99 Cobras did not make 320 horsepower at the flywheel. The result is that Ford went the conservative road when it came time to rate the engines in the '01 Bullitt. Parasitic drivetrain loss is usually not as low as the numbers you see for the Bullitt. Thus, it's clear the Bullitts are making more than 265 horsepower at the flywheel-really more like the 275hp rating Ford was originally going to give these cars. If you multiply 240 x .15 (or 15 percent), you get 36. Add 36 to 240 (assuming 15 percent as a norm) and you get the approximate 276 hp this particular Bullitt is making at the flywheel.