The comprehensive DOHC engine swap thread.

[2mAn]

can someone answer the question above about the temp sensors?

[kevdeno]

Coolant Temp Sensors:

On your E36, one sensor is for DME and the other is for gauge cluster. You have to replace the sensor which feeds signal to the E30 gauge cluster so it will read correctly. The E36 one reads a vastly different resistance for a given temp.

1. E36 DME, E36 coolant temp sensor.
2. E30 gauge cluster, E30 coolant temp sensor. Just thread it into the spot where the old E36 coolant temp sensor for gauge cluster was. See your wiring documentation to make sense of which wires do what, but it should be in the harness already and you don't have to do anything.

[2mAn]

So I need one more coolant temp sensor (E36/E34) to go to the DME and I can use the one I currently have (M20, blue with 2 pins) and just have to wire that to go to the cluster.

[Roysneon]

Leave the one for the DME alone and re use your old m20 one for the cluster.

[2mAn]

Leave the one for the DME alone and re use your old m20 one for the cluster.

mine doesnt have any sensors, so Ill need to buy the E36/ E34 one

[kevvve]

I was going over what I've done so far and this bracket looks bent to me. Can anyone chime in? Anyone have a part number?

[agent]

I believe that has to come off for (some?) E34 pans to fit.

[jclar]

I believe that has to come off for (some?) E34 pans to fit.

Seconded, iirc the e34 pan won't fit with that on anyways.

[36brua]

Seconded, iirc the e34 pan won't fit with that on anyways.

^^ true . if you remove the bracket vs. cutting off the vertical leg , you need 2 new main cap bolts. they are TTY

[kevvve]

Thanks guys I appreciate the help.

[pmat]

Dunno if its been mentioned, but a coding plug from a e28 535i works. the housing dosent fit in the e30 cluster tho, gotta take the chip out of the e28 plug.

[2mAn]

where do the intake temp sensors connect? according to the diagrams Ive found, there is two? does one plug into the head next to the coolant temp sensor?? its roughly the same location

[Steven]

Quick question, how many pins should I need to repin the c101?

[bimmerteck]

Quick question, how many pins should I need to repin the c101?

Depends on if you're keeping all chassis functionality(I've removed some circuits on cars being prepped for track use since the OE idiot lights are not useful if you have no stock cluster.) and whether you're adding any circuits for ancillary gauges and such. IIRC you can do it with as few as 7 pins but all my customers/friends end up closer to 22 male and 3 female. I add an x20 to the e30 so I could have up to 25 male pins. If you reuse the c101 you should need no more than 20 male pins. Though you need to figure out how many of them need to be large vs small. Post below is from my build thread showing how I generally rewire them including PNs for the factory pins and the pin removal tool. ;)


http://www.r3vlimited.com/board/show...1&postcount=55

[Steven]

Depends on if you're keeping all chassis functionality(I've removed some circuits on cars being prepped for track use since the OE idiot lights are not useful if you have no stock cluster.) and whether you're adding any circuits for ancillary gauges and such. IIRC you can do it with as few as 7 pins but all my customers/friends end up closer to 22 male and 3 female. I add an x20 to the e30 so I could have up to 25 male pins. If you reuse the c101 you should need no more than 20 male pins. Though you need to figure out how many of them need to be large vs small. Post below is from my build thread showing how I generally rewire them including PNs for the factory pins and the pin removal tool. ;)


http://www.r3vlimited.com/board/show...1&postcount=55

Oh I saw your thread, I was really wondering hw many large and small pins I should order.... I should've been more specific. I'm not adding or taking out anything.