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VEMS Round with Motronic 7.1

VEMS Round using the following input:

- WBO2

- EGT

- Analog 1 --> 10 bar oil pressure sensor

Q: Can't get my head round calibrating this. Can I have some help please with the configuration for analog input. The sensor is linear.

Calibration from vendor:

Sensor Output

150 PSI Gauge 0.5 volts at 0 PSI gauge pressure

(atmospheric pressure)

4.5 volts at 150 PSI gauge pressure

(150 PSI above atmospheric pressure)

150 psi sensor: pressure = 37.5 * voltage - 18.75

Any way to display in bar?

Q: 0.5V=0PSI=0bar, 4.5V=150PSI=10.34bar, with the AnalogInputCalibrationWizard?, I get calibration 129, offset 12. Correct?

- Analog 2 --> 400kPa VEMS Map sensor

Outputs:

- PWM0 -> reference RPM drive warning led for shiftlight

- PWM4 -> reference RPM drive "shift-now" led for shiftlight


shiftlight_blink_1500rpm.png

shiftlight_normal_3000rpm.png

A: Provided elaborated settings above (tested).

Q: I noticed that the output starts sending a signal around 200rpm earlier than it should probably to reach target rpm. Any way around this?

A Yes use a more aggressive control slope, use Kp = 255, Ki = 255, iLimit = 5 - DB

Please either modify the ini files or the firmware.


0V -> 10 AFR

5V -> 20 AFR

To calculate the factor, we first must remove the offset. We do this by subtracting the value at 0v from the value at 5v.

20-10=10

This number is the value at 5v without the offset applied. To get the value per voltage we just divide this by 5 (volts).

10/5=2

Our factor is 2 and the offset (value at 0v) is 10.

Now we just apply the factor for the particular RAM variable that we are working with in ME7.

uushk_w voltage factor is 0.004883, so we multiply this by the voltage to AFR factor that we calculated for our new input.

0.004883*2=0.009766

ME7Logger applies a negative offset, so in order to use a positive offset we just need to flip the sign.

The values that we have been working with are AFR, therefore to convert our input to AFR:

Factor : 0.009766

Offset : -10

- RPM input is coming from the Motronic RPM signal (instrument cluster)

Q: Can this even be configured or do we need a crank signal?! If that's the case the documentation (Help) should be change to state something other than "RPM Signal".

A: Yes RPM signal from dash is fully supported, [more info in VT help Rpm Input], example for 4cyl: rpm_toothcount=02 for a 4 cyl 2 events per rotation

Q: Any pointers on configuring it for 6 cyl 4stroke V6 engine? Setting it to 60-2 wheel does not work obviously. Thanks

A: For 6cyl 4 stroke, 6 rpm events per cam rotation, 3 per crank rotation the correct rpm_toothcount=03

Q: With above settings it is not working properly still, vemslog available at: http://nerd.hu/r2.1_4513-2015.04.02-12.42.18.vemslog