Parameter Scaling

ALL data/parameters transmitted from the ECU over CAN have units defined by the corresponding parameter calibration table(s). This can be setup and adjusted through the PC tuning software Emtune.

  1. All Data is unsigned
  2. All Data is 16 bits
  3. Low byte of each word (16bit) is transmitted first.

Examples:

  • Temperature in degrees Celsius or Fahrenheit

  • Pressure in kPa,  PSI,  InHg

  • Speed in Kph, mph, m/s

  •  

    • Speed in Kph, mph, m/s
TypeUnitsMin ValueMax ValueConversion Raw to Displayed Value
Position%Posn-100.0 %100.0 %Display = ECU value  x  0.1 - 100                   OR ECU value A:   0000 becomes  -100.0  %    ECU value B:   2000 becomes  100.0 %
PressurekPa/PSI0.0 6500.0 Display = ECU value x  0.1                    OR ECU value A: 0  becomes  0.0  kPa/PSI    ECU value B: 1000 becomes  100.0  kPa/PSI 
TemperatureoC / oF   -50.0 250.0 Display = ECU value x  0.1  - 50                   OR ECU value A: 0  becomes  -50.0 oC/   oF ECU value B: 1500 becomes  100.0 oC  / oF  
LambdaLa0.000  2.000 Display = ECU value x  0.001                   OR ECU value A    0  becomes  0.000 La     ECU value B    1000  becomes  1.000 La 
TypeUnitsMin ValueMax ValueConversion Raw to Displayed Value
SpeedKph/mph0.0 6500.0Display = ECU value x  0.1                    OR ECU value A    0     becomes  0.0  kph    ECU value B    1000     becomes  100.0  kph
Ignition AngleoBTDC-100.0 oBTDC  100.0 oBTDCDisplay = ECU value x  0.1 - 100                   OR ECU value A 1000 becomes  0.0 oBTDC     ECU value B 2000 becomes  100.0 oBTDC    
VoltageV0.000  20.000 Display = ECU value x  0.001                   OR ECU value A    0  becomes  0.000V     ECU value B    20000  becomes  20.000V    
Percentage1%0.0  100.0 Display = ECU value x  0.1                   OR ECU value A    0  becomes  0.0%     ECU value B    1000  becomes  100.0%    
Percentage2%-100.00  100.00 Display = ECU value x  0.01 - 100                   OR ECU value A    0  becomes  -100.00%     ECU value B    10000  becomes  0.00%   ECU value C    20000  becomes  +100.00%   
TypeUnitsMin ValueMax ValueConversion Raw to Displayed Value
Rate of Change1%/sec-100.0 + 100.0Display = ECU value x  0.1 - 100                   OR ECU value A    0     becomes  -100.0 %/sec    ECU value B    1000     becomes  0.0 %/sec Or  ECU value B    2000   becomes  +100.0 %/sec 
Rate of Change2rpm/sec-20000 20000Display = ECU value x   - 20000                   OR ECU value A    0     becomes  - 20000 rpm/sec    ECU value B    20000 becomes  0 rpm /sec Or  ECU value B    40000   becomes +  20000 %/sec 
G-ForceG-10.00 G  10.00 GDisplay = ECU value x  0.01 - 10                   OR ECU value A 0 becomes  -10.00 G     ECU value B 1000 becomes  0.00 G  or ECU value B 2000 becomes  10.00 G 
RPMRPM0300000Display = ECU value x  1                    OR ECU value A 0 becomes  0 RPM    ECU value B 20000 becomes  20000 RPM 
Pressure DiffkPa/PSI0.0 6500.0 Display = ECU value x  0.1 - 1000                   OR ECU value A: 10000  becomes  0.0  kPa/PSI    ECU value B: 8000 becomes  - 200.0  kPa/PSI  
Counter0 65535Display = ECU value                    OR ECU value A    0     becomes   0    ECU value B    10     becomes  10 
VVT PositionDeg-100.0+100.0Display = ECU value x  0.1 - 200                   OR ECU value A: 2000  becomes  0.0  Deg    ECU value B: 2304 becomes  30.4 Deg (Cam Advanced) ECU value 3: 1871 becomes  -12.9. Deg (Cam Retarded)