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Thread: Alternator delete with regen braking modification for better MPG

  1. #201
    Cornwallis Fummins's Avatar
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    Has anyone looked into an electric motor assist? I saw an old gm car with an LS? engine swap and a big electric motor mounted like an alternator with a wide cogged supercharger like belt going to the crank pulley. It also was a heavy car with a ton of batteries.

    I wonder if something similar but smaller scale would be worth looking into? Mount a small electric motor and have it assist the crank at cruising speeds? Might work good for putzing around town at 30-40 mph where once you're up to speed it doesn't take much power to keep moving.

    Found a link
    https://www.youtube.com/watch?v=4-Vck6oCi3A


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        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.4 mpg (US) ... 15.9 km/L ... 6.3 L/100 km ... 44.9 mpg (Imp)


  2. #202
    Administrator Daox's Avatar
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    Quote Originally Posted by ProDigit View Post
    I'm late in the game. But it appears to me, you could just swap the battery out with a Capacitor pack, or a 4 cell Lithium battery? (like those motorcycle LEGO battery packs)?
    It's lighter, it's smaller, and it doesn't need as much charging.
    It also keeps (full) charge longer.
    A capacitor pack not as much, they might deplete overnight, but usually charge within like a few seconds.
    Which reminds me, I bought a USB battery pack (one of those 11000mAh battery packs) and it had a built in car starter (400CCA, up to 4L engines it said). It's not meant to start a car by itself, but to aid with the battery that's already present in the car.
    But use that on a 3 cylinder, 1,2L engine, and you probably don't even need a car battery.
    I tried starting my 800CC motorcycle with it, after the battery was totally dead, and it worked!

    So what stops anyone from just installing 2x $35 5F (rated, in reality they're 1F or 2F) capacitors, those huge water bottle size caps, and pair it with a USB battery pack for starting? That's not even 5LBS on starting gear vs 40?


    Excellent question Prodigit! You can certainly replace your starting battery with something smaller and lighter. Loren did that with his very small lead acid battery that he used to reduce weight for his autocross Mirage. However, that doesn't stop the alternator from putting a load on the engine. Just because you have a smaller battery doesn't mean your alternator has to work any easier. When you're driving around and you turn your headlights on, your alternator now has to generate 110W (2x 55W) more power to supply the power necessary for those headlights. That means your engine has to burn ~220W more fuel because alternators are at most 50% efficient.

    This modification completely removes all load from the alternator (except the belt, alternator fan and bearings) by telling the alternator that the battery is already full. Having a capacitor bank will not do that. Even having a lithium pack won't do that unless the new battery runs at a voltage above 14.4V. Because, as soon as the battery's voltage falls below 14.4V, the alternator starts pumping out power to maintain 14.4V. This is done by the voltage regulator that is inside the alternator.
    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block

    Current project: DIY Nitrous oxide setup for ~$100

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        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)


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    LetItMarinate (04-24-2020)

  4. #203
    Still Plays With Cars Loren's Avatar
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    I just spent probably 90 minutes reading through this thread again.

    How 'bout a quick update?
    Simplify and add lightness.

  5. #204
    Administrator Daox's Avatar
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    There really isn't too much to update. The mod works great. I haven't had any other issues with it.

    I had to disable it when I made a long trip to help out a friend who had his car break down about 2 hours away. The battery just wouldn't have lasted the full trip so I just disabled it. With this in mind, I would like to set it up so it won't overcharge the battery when the alternator is turned on. However, the priority of doing this is so low it'll probably never happen. Reenabling the alternator is as simple as popping the hood and replacing the normal fuse vs my mod fuse jumper.
    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block

    Current project: DIY Nitrous oxide setup for ~$100

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)


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    Loren (10-12-2020)

  7. #205
    Still Plays With Cars Loren's Avatar
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    I was thinking about maybe setting it up with a circuit to monitor battery voltage and automatically enable the alternator when voltage reaches a certain threshold. Sort of a fail-safe. Battery gets down to 11.7 or whatever, kick on the alternator to save the battery. Maybe keep it enabled until it reaches 12.2 or something.

    I can't remember, are you just doing a full alternator disable right now? Plug-in charging as-needed? Or did you implement an brake-enable system?

    I was thinking of doing something similar, but with a solar charger so I don't have to plug the car in. Add in the low-voltage fail-safe, and it would be a fully automated system.
    Simplify and add lightness.

  8. #206
    Administrator Daox's Avatar
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    My current setup has a switch to turn the alternator on and off. I haven't tied it into the brake pedal or anything yet though.


    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block

    Current project: DIY Nitrous oxide setup for ~$100

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)


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    Loren (10-12-2020)

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