Cluster Gauge Voltage
09-22-2010, 04:38 PM
#1
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Car: 1991 Z28 Conv.
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: Stock
Cluster Gauge Voltage
For reference, I'm driving (yes, it's running now) a '91 Z28 (TPI)
This is a bit of a two part question...
1) Are the voltage levels that are read by the gauges coming from the computer, or directly from sensor data?
2) Is there any reference I can use to determine the proper calibration of any new or additional gauges?
Say I want to add a digital temperature gauge (not that I care to at this point). Is there a reference table (or book, or something) that can tell me that 2.0Vdc = 110 degrees???
From what I understand, everything (including the speedometer) on the gauge cluster is converted from a specific voltage level (0.5 - 5.0 Vdc for the speedometer)...
I was hoping that this was a standard value sent from the OBD1 computer, but am unsure at this point.
Thank you.
This is a bit of a two part question...
1) Are the voltage levels that are read by the gauges coming from the computer, or directly from sensor data?
2) Is there any reference I can use to determine the proper calibration of any new or additional gauges?
Say I want to add a digital temperature gauge (not that I care to at this point). Is there a reference table (or book, or something) that can tell me that 2.0Vdc = 110 degrees???
From what I understand, everything (including the speedometer) on the gauge cluster is converted from a specific voltage level (0.5 - 5.0 Vdc for the speedometer)...
I was hoping that this was a standard value sent from the OBD1 computer, but am unsure at this point.
Thank you.
09-23-2010, 12:18 PM
#2
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
That Does Not Compute
Are the voltage levels that are read by the gauges coming from the computer, or directly from sensor data?
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Is there any reference I can use to determine the proper calibration of any new or additional gauges?
You need to use external test instruments.
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Say I want to add a digital temperature gauge ……. Is there a reference table (or book, or something) that can tell me that 2.0Vdc = 110 degrees?
When adding a digital temp gage, the sender comes with the unit.
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From what I understand, everything (including the speedometer) on the gauge cluster is converted from a specific voltage level (0.5 - 5.0 Vdc for the speedometer)
Not if you’re referring to stock gages, they are analogue.
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Spin Me This Week . . . I’ll Spin You Next Week
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09-24-2010, 01:57 PM
#3
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Car: 1991 Z28 Conv.
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: Stock
Re: That Does Not Compute
What if I wanted to design my own gauge. How might I go about matching a specific resistance/voltage to the temperature of the engine? Are there no spec sheets anywhere on these sending units?
09-27-2010, 09:21 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
It’s A Thermistor Mister
You won’t be able to find specifications for the sending units other than resistance at a few temperature levels.
However you can plot the graph yourself VIA putting a unit in water, then heating the water while monitoring the temperature with a test instrument quality thermometer and ohmmeter.
Or, you can get a thermistor from an electronics supply house where the thermistor comes with a data sheet.
You can install the thermistor in a brass housing threaded to fit the engine.
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Happy Racing!
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I Didn’t Wreck, The Track Moved
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However you can plot the graph yourself VIA putting a unit in water, then heating the water while monitoring the temperature with a test instrument quality thermometer and ohmmeter.
Or, you can get a thermistor from an electronics supply house where the thermistor comes with a data sheet.
You can install the thermistor in a brass housing threaded to fit the engine.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
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I Didn’t Wreck, The Track Moved
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