How do you test the car on the dyno, are the published data accurate?
All the Supersprint systems are developed with performance in mind.
We test the cars, both stock and with the exhaust, on our MAHA 4x4 brake dyno, which guarantee the highest precision of the measurement.
It doesn’t simply measure the WHP (wheel horse power) and then adjust it with approximated factors, but it measures the power absorption, the ambient temperature, pressure and humidity, the air intake and engine oil temperatures and all the values transmitted through the car diagnostic port.
The runs are repeated till the values become consistent.
This allows our R&D staff to ensure the test runs are valid and the values of the car in the different configurations are comparable against each others.
We publish the results without any graphic editing, with all the values of the test associated, for maximum clarity and honesty.
Here is an example of as dyno chart (Mercedes SLS AMG):
Norm-Leistung: crank horse power, corrected by ambient values
Motorleistung: crank horse power, not correctd (sum of power loss and wheel horse power)
Radleistung: wheel horse power
Schleppleistung: power loss by friction and rotational masses inertia (includes drivetrain, tyres, dyno rollers), measured during deceleration.
Max. Leistung bei: max power revs / relative speed
Max Drehmoment bei: max torque revs / relative speed
Max erreichte Drehzahl: rev limiter / relative speed
EWG correction factor, calculates the variation from measured and absolute power based on the ambient conditions. DIN factor is obsolete and less precise.
On the right side of the page are ambient conditions during the test.
Umgebungs-Temperatur: ambient temperature
Ansaugluft-Temperature: initial intake air temperature
Relative Luftfeuchte: humidity
Luftdruck: atmospheric pressure
Dampfdruck: relative pressure from the standard (1013,2 hPa)
Ol-Temperatur: engine oil temperature
In this charts you can various curves, trasmitted from the car by the OBD II diagnostic port: A/F Ratio (purple - Lambda (OBD) II), air intake temperature (light blue - T Anslaugluft °C), intake air mass (violet, V Luftmerge gm/s).