I know the m30 runs a 78C thermostat which is a lot cooler than the m20 88C piece. Because of this the normal operating temp of my engine makes the temp guage needle sit at the first hash mark, "1/4", instead of reaching the middle mark. Will swapping out the brown temp sender in the thermostat housing with an m30 unit fix this?
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M20 temp sending unit 12-62-1-710-512
FAE Temperature Sending Unit Call (310)626-8765. May Qualify For FREE SHIPPING. Parts# 12 62 1 710 512 12-62-1-710-512 12.62.1.710.512 12621710512.
m30 temp sending unit 12-62-1-747-281
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Why on earth would I do that?
In an m30 swap car, the car has an m30 engine. The M30 runs a 78C thermostat.
The m20 runs an 88C thermostat.
Since I swapped the brown temp gauge sensor from my m20 in to the m30, it causes (I think) the needle to sit below the halfway mark. The temp sensor is looking for 88C, but since it sees 78C it reads "low". I just want to find the correct temp sensor that will make the gauge read 1/2
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So you want to take an accurate gauge and make it inaccurate? ;)
I see what you're saying, but the senser and the gauge are matched electrically. If you use the M30 senser, if it's matched to the gauge, it will still read at the 1/4 mark. If it's not matched, it may read at a different level, but now you have no idea what the actual temp of the engine is.
The gauge is reading accurately. If you want it to read higher, you have to change the actual temp of the engine with a higher temp thermostat. Why does the gauge reading low bother you?1973 Bavaria
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Originally posted by Brian D View PostSo you want to take an accurate gauge and make it inaccurate? ;)
I see what you're saying, but the senser and the gauge are matched electrically. If you use the M30 senser, if it's matched to the gauge, it will still read at the 1/4 mark. If it's not matched, it may read at a different level, but now you have no idea what the actual temp of the engine is.
The gauge is reading accurately. If you want it to read higher, you have to change the actual temp of the engine with a higher temp thermostat. Why does the gauge reading low bother you?
ThisMtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205
OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827
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The e30 temp gauge is calibrated for the e30 temp sender.
You can try the m30 sender but most likely it wont even register on the e30 gauge.
One option is to ship the cluster and have it calibrated or add aftermarket gauge to use with m30 sender.Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205
OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827
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Originally posted by CorvallisBMW View PostI know the m30 runs a 78C thermostat which is a lot cooler than the m20 88C piece. Because of this the normal operating temp of my engine makes the temp guage needle sit at the first hash mark, "1/4", instead of reaching the middle mark.Originally posted by CorvallisBMW View PostIf 78C is the normal operating temp of the engine, then why shouldn't the gauge read 1/2?
The gauge is NOT accurate currently. It reads that the engine is running cool even when it isn't.
Actually, looking at the parts catalog, both the M20 and the M30 thermostat part numbers are for an 80C thermostat (the same part, in fact). Are you sure of your numbers?
I guess the only way to be truly accurate would be to use an aftermarket gauge and sender. Then you would have a real number, instead of just where the needle is on the gauge.1973 Bavaria
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