Installing an Acewell speedo/computer on an airhead --

Discussion in 'Airheads' started by bpeckm, Nov 23, 2009.

  1. bmwhacker

    bmwhacker Still on 3 wheels

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    Received my Acewell unit today...will be wiring it up this weekend....my BMW (using a 1974 R90/6 chassis / wiring) was a mechanical tach unit with points...I'm a little unclear about how to hook up the tack...they refer to "wrapping a wire around the coil 2 -5 times...." I have two coils..they do not address that...Do I wrap both coils? The picture shows them "wrapping a coil (sparkplug) wire" rather than a "coil". Wrap both wires or one?....I don't know....never seen a tach hooked up that way......I'm a bit confused on that one.......
    #41
  2. wirewrkr

    wirewrkr the thread-killer

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    You have allready aired this complaint in another post......
    Any resolution to this yet?/
    HAve they given you any answers yet?
    Robert
    #42
  3. bmwhacker

    bmwhacker Still on 3 wheels

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    No.................read the other thread........the situation kind of died in its' tracks....I guess it's "no ones" fault................
    #43
  4. wirewrkr

    wirewrkr the thread-killer

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    Someone is at fault, somewhere.
    The only thing that I want to add is that after the lengthy explanation on the other thread, at 4:44 p.m. you came back here to this thread and started it all over again.... without the lengthy explanation and with no reference to the other thread..at all.
    Lets play fair.
    Robert
    :ddog
    #44
  5. bmwhacker

    bmwhacker Still on 3 wheels

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    Yes, you are 100% correct........"Deleted"..........may the internet gods forgive me and my errant ways......Bottom line is that the Acewell Unit looks like a good buy......and I am sure I will like it. Plus this thread is a big help for the installation....The people at Acewell have been great to deal with so far...I would not hesitate to purchase from them again.....I received the unit today and it looks good!
    #45
  6. bmwhacker

    bmwhacker Still on 3 wheels

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    Mounted my Acewell speedo today and started to sort out my wiring.....sat down with your info and double checked to my 1974 wiring harness....all looks good except that mine was a mechanical tach.....When picking up your "unswitched" clock power (red) which terminal in the headlight pod did you tap to? Your work shown here sure is making my life easier!!!!! I'll buy you a beer or two if we ever cross paths!!!!!!!
    #46
  7. bmwhacker

    bmwhacker Still on 3 wheels

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    PS.....I used the existing BMW gauge mount after some modifications (cutting / bending) also has some (old /kinda stiff) rubber mounting grommets so it might reduce a little vibration.......I'm using a /5 steering friction damper on an Earls Fork so had to clear the /5 friction damper knob. Couldn't do a handlebar mount like you did as the damper knob is in the way.......so far so good.......I'm building a "Rat BMW sidecar tug" so don't want anything to look too pretty. Maybe I'll try to get a photo or two up tomorrow.
    #47
  8. bpeckm

    bpeckm Grin!

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    I too will be mounting one on my /6 with mechanical clock, some day.... Regarding the tach hookup: in may be mistaken (moi?...!!!) but I would try the following...

    The tach "signal" for the electronic ignition is the equivalent of the points signal for the points bikes... i.e. the "hot" wire to the coil(s). Your two coils are wired in series in way that fires each coil. One wire comes from the harness (actually, the points), and then jumps over to the other coil. Thus, on the coil with two wires, tap into the terminal that does not have a wire going to the other coil.

    Otherwise, you can wrap the Acewell pickup around one of the sparkplug high tension leads, as the describe in the instructions.

    My preference, by far, would be to use the coil pickup.

    :D

    So, try it, and let us know whether that is right, and if it is, I can thank you for figuring it out for MY /6....!!! and we can buy each other a beer....:jump

    oops... re: red wire: any place that is convenient will do, either the circuit board or the switch terminal.
    #48
  9. bmwhacker

    bmwhacker Still on 3 wheels

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    Success today.:clap ...got all the wiring figured out and only had three BMW harness wires left over!...1) the brake fluid level warning light which the Acewell has no light for......... 2) ended up with a white / black stripe wire which does not appear on any of my diagrams...it was a hot wire which activated with the key switch. Simply sealed it up and taped it in the loom.......3) and then the dual turn signal indicator...I did as the "author" and brought the left / right signal leads in individually....everything worked as it should.....rigged a seperate temporary wire for the "gen" light to make sure things functioned properly.
    Will need to figure out the speedometer pickup assembly still....a couple of photos in this thread have given me some direction......

    [​IMG]

    Had to be a little creative to clear the /5 friction damper I have on this rig....simply shortened the existing gauge mount and bent it a bit downward to gain the angle I wanted.....then fabricated a couple of spacers to gain the clearance height I needed for the damper knob. This stays in line with the "Rat" look I'm leaning towards.....The knarly looking wire / light to the left is a temporary "gen" light. I'll make a bracket for a red one and mount it off to the side....This thing is a "Rat" bike but the temporary "gen" light is even a too bit ratty for me...

    [​IMG]

    Nice, simple, clean looking gauge.............I temporarily wired the tach using the "wrap" method prescribed....seemed pretty erratic so I'll hook into the coil as the author describes.....

    [​IMG]
    I've been assembling this thing from parts and pieces from multiple donors for the past year, from the raw frame and up, and sometimes down .......should be ready to roll in a month or two....(?) I even rode it up the street and back today for its' maiden voyage (50 yds.) , albiet a little prematurely......(worn out, square front tire with 10 or so lbs. of air....)

    [​IMG]



    This thing has dual discs with pretty tight areas so looks like I'll be utilizing one of the right side brake disc bolts and mounting the speedo pickup to a spot right behind the axle.
    [​IMG]
    #49
  10. bpeckm

    bpeckm Grin!

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    Nice! I was on the other thread and thinking of asking for a shot of the front end of the bike... I could see the Earles and wanted to see more of the brake....

    DO let us know about the wire-to-the-coil method.

    :D

    Note: I don't know if I mentioned calibrating the speedo in the thread... but I did it by trial and error and a known quantity. I looked up the RPM/speed chart, and figured out exactly how fast I should be going for, say, 3000rpm.

    I then set the Acewell up so that I could easily read the RPM and the speed (both are digital readouts), and then did the trial=amd-erro part: adjust the circumference number up or down until the speed readout is where it should be at that given rpm. I think it took four or five stop-and-goes.... Read it, stop the bike and open the menu and change the number, then go. Repeat as necessary!

    Good luck... bike is looking great! :thumb


    :rayof
    #50
  11. bmwhacker

    bmwhacker Still on 3 wheels

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    Installed the permanent generator light tonight...was able to find a little 5/16" diameter LED light....headlight shell had the room so drilled the shell (gasp) and mounted there.....looks ok....

    [​IMG]
    #51
  12. WABuckeye

    WABuckeye Been here awhile

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    Love the Acewell look and will probably be getting one myself. Do any of you guys know if there is a complete and updated wiring kit for these bikes. I have a 1978 R100/7 that I would like to have completely rewired with all new more modern stuff.
    #52
  13. bpeckm

    bpeckm Grin!

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    What do you have in mind?.... "new more modern stuff" like what? The wiring loom is simply a collection of wires that could be used/adapted for a lot of different things on a bike...

    There are also a lot of sub-harnesses on the bikes: for each of the perch/switches, for the various ignition systems as well as charging systems, the turn signals etc.

    Fellow ADV'r wirewrkr is, as might be guessed, available for custom loom work, and any good electrician would be able to get things working with a non-standard loom as well...

    Whatcha thinkin....?? :confused

    :D
    #53
  14. bmwhacker

    bmwhacker Still on 3 wheels

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    I'll also go with your recommendations playing with the speedo calibration.....I've been told that the Earls Fork pictured is a BMW /2 unit which has been modified with different shock mounts, fender, etc. (?).....The disc brakes are a Japanese type so came from a donor in years back and the mounts were fabricated......The original Donor Tug (wrecked from a hack side swipe) was built by a guy in the S.F. Bay area years ago according to the P.O. All I used from the donor tug was the sidecar sub frame, front end and the engine (was rusted tight).....
    #54
  15. makazica

    makazica Been here awhile

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    Cheers gentleman!

    I have a friend that owns a 1960 R69S and he would like to fit a ACE 2900 on it just to have a tachometer.

    As he is an older guy not very into computers I'm trying to help him. Electricity is not my thing so please bare with me on these questions.

    How do you get a signal for the tach from a boxer, where and how do you connect the wire supplied from acewell to get a correct reading?

    Pics would be good.....

    Here's one for you...

    [​IMG]
    #55
  16. batoutoflahonda

    batoutoflahonda Long timer

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  17. MIOB

    MIOB Long timer

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    #57
  18. SVARTH

    SVARTH reset and go further

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    Hi everybody....

    I am installing a trailtech vapor on my G/s......

    and keeping a seperate light for generator....

    do you know if the new light-lamp has to be something specific on Amp or can I use any micro-led lamp....???

    thank you....
    #58
  19. B-M-Double-Noob

    B-M-Double-Noob Noob x 2

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    I don't think an LED will work, as they require a specific polarity (pos to one side neg to the other)... has to be a basic lamp as far as i know. i'm doing the same and used a little lamp from RadioShak
    #59
  20. azcycle

    azcycle Chihuahua Wrangler

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    Wow, what a great thread. I was researching adding a new gauge to my r65 and came across the Acewell separately, then found this thread this morning.

    I'm curious to know about the speedo cable that actually attaches to the gearbox like the stock setup. MIOB, you said you used a modified Suzuki cable... would you mind explaining the modifications, as I'd like to pursue that route than the magnet/rotor option.
    #60