MXS connecting VDO 0-10 Bar
#1
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Hi,
im trying to figure out how to connect a 0-10 Bar VDO Oil pressure sensor.
I have created a new sensor in race studio 3 and entered its values:
Bar -- Ohm
0 10
0,5 21
1 31
1,5 42
2 52
3 71
4 90
5 107
6 124
7 140
8 156
8,5 163
9 170
10 184
Race studio suggested me to use 2700 Ohm pull up. So i connected the Signal from the VDO Sensor to Analogue In 1 and put VRef with a 2.7k Ohm resistor to the signal line.
Doesnt seem to work. Am i missing something essential?
Thanks
im trying to figure out how to connect a 0-10 Bar VDO Oil pressure sensor.
I have created a new sensor in race studio 3 and entered its values:
Bar -- Ohm
0 10
0,5 21
1 31
1,5 42
2 52
3 71
4 90
5 107
6 124
7 140
8 156
8,5 163
9 170
10 184
Race studio suggested me to use 2700 Ohm pull up. So i connected the Signal from the VDO Sensor to Analogue In 1 and put VRef with a 2.7k Ohm resistor to the signal line.
Doesnt seem to work. Am i missing something essential?
Thanks
#2
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Is this an AiM VDO sensor or one you supplied? The AiM sensor is in the included sensor list and the harness with it has the resistor built in.
#3
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Its my own sensor, so no built in resistor there.
So what i did is:
Connect signal line from VDO Sensor to Analog In 1
VRef with a 2.7k Pullup to the Signal line.
Created Sensor in Race Studio (Input Type Ohm, Calibration Type: none -- what does it mean btw?)
Analog GND to chassis GND
Do i need to connect one of the GND lines from the bigger connector (its a mxs strada) to chassis GND as well?
When i go to live measures, live studio always shows a reading of 5v for that sensor.
So what i did is:
Connect signal line from VDO Sensor to Analog In 1
VRef with a 2.7k Pullup to the Signal line.
Created Sensor in Race Studio (Input Type Ohm, Calibration Type: none -- what does it mean btw?)
Analog GND to chassis GND
Do i need to connect one of the GND lines from the bigger connector (its a mxs strada) to chassis GND as well?
When i go to live measures, live studio always shows a reading of 5v for that sensor.
Last edited by filth; 08-01-2016 at 03:16 AM.
#4
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The analog ground goes to the second VDO wire, not the chassis. If you put it to the chassis, it will always read 5 volts because there is complete resistance (signal to vref).
I haven't seen a MSX Strada harness, but assuming it's like the MXL2, MXS, MXG, it has a ground for the dash and another for the k line. The dash is the only one that has to be hooked up.
Here's how AiM does it http://www.aim-sportline.com/downloa...DO_104_eng.pdf
I haven't seen a MSX Strada harness, but assuming it's like the MXL2, MXS, MXG, it has a ground for the dash and another for the k line. The dash is the only one that has to be hooked up.
Here's how AiM does it http://www.aim-sportline.com/downloa...DO_104_eng.pdf
#6
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Ok i fixed it, so im getting around 3 bar with engine running but -0.7bar with engine stopped. i guess there is something like a calibration needed? Can you explain how the calibration buttons in race studio work?
Last edited by filth; 08-01-2016 at 12:11 PM.
#7
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There is no calibration for that sensor. The calibration is for a rotary, linear, or string style sensor where you want to set limits i.e. start, end, middle.
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#8
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Hmm strange thing: i only get plausible readings when i enter the sensor curve with its ohm - bar values and then set the input to mv instead of ohm. Im confused - i would expect it to work properly when i set the input type to ohm?
#9
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I would have to play with it some. Your dash only reads voltage, so the ohm setup is to help you figure the pull up resistor and voltages.
#10
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Ok i understand, that it can only measure voltage. But how come that there is an effect on the reading wheather i choose ohm or mV as the input type in the sensor creation screen?