Power Runs; Calculating Losses - Racelogic PerformanceBox Manual

Racelogic Ltd Power Mode

Power Runs

Once the vehicle weight has been set, a simple power run can be carried out to give engine output
at the wheels. Put the car into second gear at a low RPM, 2000 RPM or less.
Press OK, the next screen indicates that PerformanceBox is ready to record the run:
Once the car begins to accelerate, the power is being recorded:
Accelerate to the top of the engine's rev range, disengage the clutch and make a note of the car's
speed as this will be required during the losses run, then coast for a few seconds. PerformanceBox
will record the amount of power as soon as it recognises deceleration:

Calculating Losses

So as to estimate power output figures at the flywheel, you will need to configure the amount of
loss generated by tyre and air resistance. To do this requires a 'coast-down' test. It is
recommended that this is carried out in third gear.
With the weight correctly entered, switch from the Power Run screen to the Losses Run screen
using the ▲▼ buttons. The screen will display a similar initial instruction to the Power Run:
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