Q: How do i set user scalars?
Moderators:R!C0, JonMan, RickS
A: Example:
This will allow GWv3 user interface and associated logging tools to show Engine Load in kPa.
Using a DELCO 20-315 absolute pressure sensor.
Sensor Range 20 to 315 kPa
Output Range (volts) = Us ((P/437.5) - 0.0143)
Since Us is a nominal 5.0 Volts.
A signal of 0volts = 20 kPa A signal of 5volts = 315 kPa
This range is rescaled by MAP min and MAP max options.
So if MAP min = 0.06V and MAP max = 4.90V
The range of load will be: min = 20 + (295kPa × (0.06/5.00) = 23.4 kPa max = 20 + (295kPa × (4.90/5.00) = 309.1 kPa
For an ECU with an underlying (default) range of load 0-100%
Set Load scalar = (309-23)/100 = 2.86 And Load offset = 23.3 Then configuer units from top tool bar to kPa
Set Load Error scalar = 2.86
Note since Boost Error is a relative measure it has no offset.
This will allow GWv3 user interface and associated logging tools to show Engine Load in kPa.
Using a DELCO 20-315 absolute pressure sensor.
Sensor Range 20 to 315 kPa
Output Range (volts) = Us ((P/437.5) - 0.0143)
Since Us is a nominal 5.0 Volts.
A signal of 0volts = 20 kPa A signal of 5volts = 315 kPa
This range is rescaled by MAP min and MAP max options.
So if MAP min = 0.06V and MAP max = 4.90V
The range of load will be: min = 20 + (295kPa × (0.06/5.00) = 23.4 kPa max = 20 + (295kPa × (4.90/5.00) = 309.1 kPa
For an ECU with an underlying (default) range of load 0-100%
Set Load scalar = (309-23)/100 = 2.86 And Load offset = 23.3 Then configuer units from top tool bar to kPa
Set Load Error scalar = 2.86
Note since Boost Error is a relative measure it has no offset.