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Tech Forum : M42 install help? (E21 wiring and speedo readings)

- BMW E21 Community
   - Tech Forum
      - M42 install help? (E21 wiring and speedo readings)
Funkmasta   Posted Tuesday, Feb 6th 4:20am [Edit] [Quote] [IMS] [View car]
Junior Member
Post nr. 1

Portland OR
88 M3, 90 M3, 87 335is, 87 325ic
Hello Everyone!

We are in the middle of installing an M42 into our 81 320...


Mounting and location of the motor went well, but now we are on the mission of how to wire in the beast.

Our 2 biggest obstacles right now, are speedo readings, and interfacing the different plugs.
Can anyone give me the pinout for this plug?


Thanks!

Joe Funk
Autobahn Sport

matakie   Posted Saturday, Mar 10th 5:50pm [Edit] [Quote] [IMS] [View car]
Junior Member
Post nr. 1

silvolde nl
several bmw,s
hello look here http://web.archive.org/web/200402140...silverdust.htm regards jeroen megens

M42powered   Posted Tuesday, Mar 13th 9:33pm [Edit] [Quote] [IMS] [View car]
Staff
Post nr. 695
   
Arizona, USA
1981 BMW 320i
wow... I like seeing this. Keep this thread updated. Let me know if you need help.

imaradiostar   Posted Tuesday, Mar 13th 11:31pm [Edit] [Quote] [IMS] [View car]
Member
Post nr. 1031
   
Nashville, TN
81 323i, 82 525i, 85 524td, 90 535i
Which transmission are you using?

If you're using the M42 tranny you'll need to use a later speedo (electronic) and make a chopper wheel to send the signal.

jamie

M42powered   Posted Wednesday, Mar 14th 3:57pm [Edit] [Quote] [IMS] [View car]
Staff
Post nr. 696
   
Arizona, USA
1981 BMW 320i
imaradiostar wrote:
Which transmission are you using?

If you're using the M42 tranny you'll need to use a later speedo (electronic) and make a chopper wheel to send the signal.

jamie


Or just not use a speedo like me.

melloh   Posted Thursday, Mar 15th 9:17pm [Edit] [Quote] [IMS] [View car]
Member
Post nr. 512
   
California, USA (San Jose)
1980 320is, 1991 318is
didn't someone make a write-up on using one of those bicycle speedometers somewhere and just calibrating it to the car's wheel size? Said it was accurate w/in reason, economical, and even has a built in lap timer (and maybe even a heartrate monitor for you ... ha ha ha).

realcrouton   Posted Thursday, Mar 15th 10:34pm [Edit] [Quote] [IMS] [View car]
Member
Post nr. 113
   
Washington, USA
1977 320i, 1981 323i, 1991 325ic, 2000 328i
Pretty sure the guy with the bike speedo was cnvkellogg. He had that really sweet light blue track car, he was from Eugene. I think he sold his car though, I remember seeing it on Craigslist.


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