Dyno Test (Dynamometer)

Rolling-road dynos measure the power that actually reaches the wheels. Tuners use them to check results and to fine-tune engine maps safely. Results vary between dynos, temperatures and correction methods. Air temperature and pressure affect results, so dynos apply correction standards such as DIN or SAE.

The car drives heavy rollers or a brake; the dyno measures force and speed and calculates power and torque curves from them.

Compare before-and-after results from the same dyno on the same day for a fair picture. A dyno run puts full load on the engine, so oil level, cooling and tyres must be in good condition.