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Coolant oil etc sensors
https://www.slantsix.org/forum/viewtopic.php?t=6985		 Page 1 of 1
Author:  Pierre [ Tue Sep 23, 2003 4:32 am ]
Post subject:  Coolant oil etc sensors
Does anyone have the charts of what the resistance vs quantity measured of any popular sensors out there (including the stock A body sending unit), wether they are mopars or not? I know www.diy-efi.org had them for the GM sensors but untill they are back up.....

I believe the stock sending unit is linear so if someone has one not in a tank, I would appreciate it if you could measure the resistance when in full and empty positions.

This is all to add to the bundymobile tach in hopes of possibly making it a full blown digital dash. I've just recently added a voltmeter to it, getting just one step closer at a time.
Author:  relic-lover [ Tue Sep 23, 2003 7:13 am ]
Post subject:  63 dart fuel sending unit
fuel sender was 96 ohms and 0 ohms
I don't remember which was F and which was E
I can check again with the one bench tonite.

I finally checked - 86 empty and 8 full -
And not linear the windings are longer and closer
together from about half down to empty.
Author:  Seis Inclinado [ Tue Sep 23, 2003 9:56 pm ]
Post subject: 
A quote from http://auto.howstuffworks.com/framed.ht ... .html#faq1

Here are a few other thoughts to help match the ohms of the sender to the gauge:

GM cars (most) are 0-30 ohms [empty - full] prior to 1965
GM cars (most) are 0-90 ohms [empty - full] 1965 to present
Ford cars (most) are 16-158 ohms [empty - full] 1987 to present
Ford/Chrysler cars (most) are 73-(8-12 ohms) [empty - full] prior to 1987
Studebaker cars (most) are 240-33 ohms [empty – full] unknown years
VDO kits are 10-180 ohms*
Auto Meter kits are 240-33 ohms*
Stewart Warner kits are 240-33 ohms*
Classic Instruments, Inc. kits are 240-33 ohms*
ISSPRO, Inc. kits will be 240-33 ohms (available: winter 2000)
After market - available in most ohm ranges except 0-30 ohms.
End quote

Pierre: Is this what you need?
I have three sending units for F bodies and all three are 65 - 10 empty-full.
Haynes Repair Manual for Dodge, Plymouth & Chrysler 1971 thru 1980 for A, B, C, E, F, J, M, R bodies says 60 to 75 ohms empty 5 to 8 ohms full (I guess you already know this)
Author:  Pierre [ Tue Sep 23, 2003 10:29 pm ]
Post subject: 
Seis,
Yep. Looks like 75 ohms full and 8 ohms empty is the consensus? D*mn, I wish I remember what my unit read. I measured it but never recorded it.
The difference between 5-8 ohms on the low end is almost negligable, I'm just worried about the 60-73 spread. I suppose I can fill my tank up and use the ohmeter at the gas station ;)

Now I just need coolant and oil. The hard part about recreating those is that I don't think they are linear so I may have to do some sort of lookup table on those, hmmm....

Thanks for all the input guys, keep it coming if you can!
Author:  Bob D [ Wed Sep 24, 2003 7:52 am ]
Post subject: 
Pierre,
I plotted out the GM temperature sensor in my EFI article. I think that I got the numbers from a table, but I don't remember where I found the table. http://slantsix.org/articles/dibiase_ef ... ersion.htm
Bob D
Author:  Pierre [ Wed Sep 24, 2003 7:17 pm ]
Post subject: 
Bob, that graph looks like it was made in excel... any chance you still have the original excel spreadsheet?
Author:  Bob D [ Thu Sep 25, 2003 6:40 pm ]
Post subject: 
Pierre,
I found a chart for the GM coolant sensor in a factory '85 Olds service manual. I think it's the chart that I used to do the graph. Here are the values from the chart:
210 deg F ---------185 Ohms
160 deg F----------450 Ohms
100 deg F----------1800 Ohms
70 deg F-----------3400 Ohms
40 deg F-----------7500 Ohms
20 deg F-----------13500 Ohms
0 deg F-------------25000 Ohms
-40 deg F------------100700 Ohms
Bob D
Author:  Pierre [ Thu Sep 25, 2003 7:50 pm ]
Post subject: 
Bob - You hit paydirt. That along with curve fitting I can probably get within 5 degrees accuracy.
Author:  Dart270 [ Fri Sep 26, 2003 6:23 am ]
Post subject: 
That curve for the GM sensor is also on the megasquirt site - maybe in Lance's FAQ manual.

Lou
Author:  Pierre [ Fri Sep 26, 2003 10:41 am ]
Post subject: 
Coolant temp measurment is up and running!
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