DIGITAL ECU TUNER 3 – User Manual
Road dynamometer
It is possible to generate the torque and power graph on the
vehicle’s wheels
, based on the data from the data log.
Additionally, it is possible to put any signal from the analog inputs on a graph. To do this, it is required to drive on
a flat fragment of the road, which will allow the car to accelerate on a given gear in the full rotational speed of the
engine. Next, choose a proper configuration of the car’s parameters (
Dyno/Parameters menu
):
First, RPM ratio factor should be calculated. It is the value which, multiplied by the rotational speed of the engine,
will give a current speed of the car:
RPM
ratio =
V / RPM,
where V is the vehicle’s speed in km/h, and RPM is the rotational speed of the engine. Another method is giving the
precise parameters of the gear box and tires of a car. (
Gearbox and tires
section).
Gear ratio
The difference in rotational speed from the input to the output shaft
Driving axle gear ratio
Współczynnik przełożenia głownego
Tire section width
Tire’s width in millimeters
Tire profile
Profile of a tire
Wheel diameter
Wheel diameter in inches
After filling the table with parameters, press
Calc. RPM ratio
button. Another important parameter is the car’s
mass (
car mass
), which should be given in kilograms. It is possible to do a correction according to the
caraerodynamic. To use this function, activate the „
Enable aerodynamic correction
” option and then configure the
parameter of the resistance factor (
Coefficient of drag
) and the frontal area of the car (
Frontal area
). This data can
be found in the catalogue information of the car.
Page 39
www.ecumaster.com
