Hi,
I am going to say right off the bat that I may be overthinking this, but figured this would be helpful to know for others doing this swap as well.
I've recently measured my e30 cluster temperature gauge and plotted 1/4, 1/2, and 3/4 temp gauge needle location based on the ohm reading from the single pole sending unit 12 62 1 710 512.
Ive confirmed these numbers using two clusters and used two ohm meters ,
Variable resistor and also fixed 5% resistors so I am pretty confident in these numbers .
E30 temp gauge at end of the blue mark needs about 115 ohms, 1/4 mark needs 70 ohms, 1/2 mark is 46 ohms, 3/4 mark is around 32 ohms red starts at 24 ohms and maxed out at 14 ohms .
Next, what I did was used a new 12 62 1 710 512 sending unit and measured its resistance based on the hot water temperature using a cooking digital thermometer.
Here is what I've ended with
68f is 774 ohms
83f is 376 ohms
130f is 197
140f is 161
150f is 135
160f is 112
170f is 95
175f is 81
180f is 74.5
185f is 68
190f is 64.5
195f is 61 ohms
So, having this data you can see that middle mark of the e30 temp gauge using 512 sender would mean it's over 195f.
Tomorrow I'll measure again using digital infrared thermometer to what numbers I get from the 512 sender.
And, also I'll measure my 512 sender on the running m60 at the 1/4 and 1/2 mark on the gauge in the car and report back .
The point of all of this is to validate how accurate our temp gauge readings are when using 512 sender on m60 engines .
Now, it's a known fact m6x engines run hot, but I figured it would be good to have some good data to understand the delta etc.
Any thoughts or other data points ?
Thanks
I am going to say right off the bat that I may be overthinking this, but figured this would be helpful to know for others doing this swap as well.
I've recently measured my e30 cluster temperature gauge and plotted 1/4, 1/2, and 3/4 temp gauge needle location based on the ohm reading from the single pole sending unit 12 62 1 710 512.
Ive confirmed these numbers using two clusters and used two ohm meters ,
Variable resistor and also fixed 5% resistors so I am pretty confident in these numbers .
E30 temp gauge at end of the blue mark needs about 115 ohms, 1/4 mark needs 70 ohms, 1/2 mark is 46 ohms, 3/4 mark is around 32 ohms red starts at 24 ohms and maxed out at 14 ohms .
Next, what I did was used a new 12 62 1 710 512 sending unit and measured its resistance based on the hot water temperature using a cooking digital thermometer.
Here is what I've ended with
68f is 774 ohms
83f is 376 ohms
130f is 197
140f is 161
150f is 135
160f is 112
170f is 95
175f is 81
180f is 74.5
185f is 68
190f is 64.5
195f is 61 ohms
So, having this data you can see that middle mark of the e30 temp gauge using 512 sender would mean it's over 195f.
Tomorrow I'll measure again using digital infrared thermometer to what numbers I get from the 512 sender.
And, also I'll measure my 512 sender on the running m60 at the 1/4 and 1/2 mark on the gauge in the car and report back .
The point of all of this is to validate how accurate our temp gauge readings are when using 512 sender on m60 engines .
Now, it's a known fact m6x engines run hot, but I figured it would be good to have some good data to understand the delta etc.
Any thoughts or other data points ?
Thanks
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