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Thread: Motogadget M-Unit Blue

  1. #1
    Join Date
    Nov 2013
    Posts
    74

    Default Motogadget M-Unit Blue

    I started a new project while I'm waiting on my rebuilt engine from Quicksilver. I'm going to replace the engine wiring harness because I'm switching from my old Haltech ECU to Performance Electronics. As long as I'm rewiring, I decided to radically simplify the body harness too.

    The Motogadget M-Unit is a solid state electrical control system designed for motorcycles. Our cars are only slightly more complicated, so I think it'll work out well. Benefits:
    • Eliminate most fuses and relays because the M-Unit handles all of these natively
      • Fuel pump
      • Radiator fan
      • Starter
      • Ignition
      • Parking lights
      • Headlights
      • Highbeam
      • Brake
      • Horn
      • Turn signals/Hazards

    • Move all of my controls to the steering wheel to make me feel more like Kimi Raikkonen (turn, hazard, headlights, horn, starter and wiper all on the wheel)
    • Keyless start through smartphone paring
    • 3-flash turn signals (or hold to flash for a designated amount of time)
    • 1-button headlight control for on, off, flash, high beam, low beam
    • Built in alarm (which I'll probably disable)


    Here is my (draft) body wiring diagram. It's not quite complete because I'll still need separate circuits/fuses for
    • Main fuse
    • Alternator
    • Electric water pump
    • Dash
    • Reverse light
    • Wipers



    And here is the steering wheel with buttons mounted and wired.


    I'm also replacing all of the gauges with an Aim MXS Strada. So that also cleans up loads of wires from under the dash.

    Hopefully by the time I have all of this rewired the engine will be back and it'll be time to work on the engine harness.

    If anyone is interested, I'll post updates as I uncover issues and resolve them. If this works I'll probably start putting M-Units in all of my race cars and hot rods. It packs a lot of functionality into a very small package at a reasonable price.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    Join Date
    Jul 2013
    Posts
    191

    Default

    Cool project. But, you'll never pass for Kimi, using so many words.

  3. #3
    Join Date
    Aug 2009
    Location
    Escondido, CA
    Posts
    262

    Default

    Very cool. I like your thinking here in the circuit layout. I'm presently building a cafe racer bike for a customer and installing the Motogadget M-unit Blue in it. I've been thinking of installing one in my Seven as it goes back together..... at least when I get as far as the wiring. Besides the small physical size of the Motogadget and the bluetooth features I particularly like LED circuit health displays. It's very easy to troubleshoot an issue as a result. Pricing is reasonable too ($300 for non bluetooth and $379 for the bluetooth unit). Conversely their speedo and tach are definitely pricey at $579 each!!!!

    I have the same general concerns as you regarding the overall power handling capability of the unit. Do you know how much power the system can support? I have not seen that listed in the manual. But then again, I haven't sat down and studied it closely either. .... Based on the lack of clear definition that I've seen so far and the small wire size for the hot and ground leads I'm a little bit concerned about eliminating relays for the high demand circuits and about the overall power capability of the system as the installation manual notes that it can handle up to 200Watts for the headlight switching circuit (more than the 10Amps shown for the circuit breakers). So there is some inrush capability built into the system. Each of my 2 Spal fans draws about 7 amps steady state with significantly higher inrush current (maybe something like 40Amps each peak for a few milliseconds). Conversely the manual wiring diagram shows the various circuit breaker limits as 30 Amps for the starter circuit (probably not sufficient for my old Kent engine with hi-torque starter), 10Amps each for the 8 circuits for turn signals, low beam & tail lights, high beam, brake lights, horn, & aux1 and 20Amps for the two aux2 circuit posts.

    For my customer's motorcycle I'm using a standalone starter relay and another Bosch-type for the cooling fan circuits with the Motogadget just driving the switching power to the relays. As a result I'm planning similarly to use the Motogadget to drive a conventional starter relay as well as a pair of normal Bosch-type square relays for the fans on my Seven. In the end, the relays are cheap. And letting the smoke out of the Motogadget is not ($379). I've been thinking that it's worth a call to the manufacturer to clarify the operating limits. I will at some point but I haven't gotten around to it yet. I'll just have to remember the 9Hr time difference from California to Germany when I get ready to call them.

    Please keep us updated on your progress.
    Last edited by escondidoron; 10-05-2018 at 08:46 PM.
    Ron

    '14 Evora IPS
    '84 Turbo Esprit
    '77 S1 (deceased)
    '62 Lotus Seven S2 109E Cosworth

  4. #4
    Join Date
    Nov 2013
    Posts
    74

    Default

    @escondidoron - I have the same concerns. The amperage is fine for steady state, but may not be happy for the spikes when fans and pumps start up. I've emailed Motogadget to try to get more detail. Next weekend I plan to wire up what I can and see what happens. If I need to add relays I will, but I'd really like to keep the wiring loom as simple as possible.

    I wish they made just a slightly more robust M-unit for cars (I guess that would be a C-unit). 2 more circuits and higher amp ratings, plus some software tweaks, would make it a hit for hot rods, Sevens and other kit cars. Still a bargain compared to MoTex PDM, RacePak Smartwire, Cartek PDP, or HPE Powerbox.

  5. #5
    Join Date
    Nov 2013
    Posts
    74

    Default

    I installed the M.unit this weekend and it is working perfectly. I contacted Motogadget to see what "spike" amperage the circuits could handle, but they did not have that information. I figured it would be fine since motorcycle lights, fans and pumps spike when first turned on too. Worst case is it'll trip the circuit breaker and I'll have to reset the unit. So far it powers my fan, headlights and fuel pump with no issues. I'm pretty sure I won't even need a starter solenoid. I just wish it had another AUX circuit to power my electric water pump.

    Keyless start works perfectly, and everything is controlled from my steering wheel momentary pushbuttons.

    I altered the setup slightly from the diagram above. The M.unit handles parking lights differently than most cars, keeping the headlight on dimly. For now I'll probably just leave them disconnected since I don't think I've ever used parking lights in my 30+ years of driving.

    I won't be able to make much more progress until I get the engine and new ECU back.

  6. #6
    Join Date
    Aug 2009
    Location
    Escondido, CA
    Posts
    262

    Default

    Thanks for the follow up. I'm glad to hear that it is working well w/o additional components. That will simplify my installation too.Question: Are you using a key switch or are you going to use your phone for system activation?
    Ron

    '14 Evora IPS
    '84 Turbo Esprit
    '77 S1 (deceased)
    '62 Lotus Seven S2 109E Cosworth

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