On Mon, 1 Nov 1999, Rich Kula wrote: > Could someone describe exactly what Dyno Testing is? In a dyno test, your car is placed on rollers similar to those used at many modern emissions testing facilities. The front wheels are locked into place somehow and the rear wheels spin the rollers. The rollers are a known weight. By entering in the gearing and tire size of your car and measuring how quickly the rollers can be accelerated to a given speed, the computer in the dyno can calculate the amount of horsepower produced by the car. The results of this type of dyno (a "chassis" dyno) measure the amount of power at the wheels. Typically this is about 15% less than the engine actually produces, due to drivetrain losses. The DeLorean's 130HP rating is engine horsepower, so a stock DeLorean in good condition would read about 100-110 HP on a chassis dyno. You can measure engine output directly with an engine dyno, however this requires removing the engine from the car and so is much less common.