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Thread: The Juiced Drag bike progress post

              
   
   
  1. #71
    Old EV Racer EVcycle's Avatar
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    We finally got to go test. Had a great time, the bike ran flawlessly.

    We were running 475 of the 660 available amps... Voltage drop per cell only got to 3.76V.

    All of the runs were in the mid 8s (8.6@83 mph) in the 1/8. Perfect for bracket racing!
    We had a lot of attention from the spectators who wanted to see the "silent bike".
    Here is a short video of one the passes.



    Me starting a burnout.

    Carolina dragway aug 18.jpg
    Last edited by EVcycle; 25 August 2018 at 1328.
    EV Ed
    Never let being a responsible adult get in the way of passion and curiosity.
    Juiced Drag Racing
    Motenergy.com
    Ev album 2456, 2458, 2457, 2681, 3456, 3630

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  3. #72
    Old EV Racer EVcycle's Avatar
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    Another great night of 8 seconds 1/8 mile passes. The bike pulls strong all the way.
    We entered a motorcycle shoot out only to red light in the first round by .016 sec.

    Too much torque??

    DSC_0017a.jpg
    EV Ed
    Never let being a responsible adult get in the way of passion and curiosity.
    Juiced Drag Racing
    Motenergy.com
    Ev album 2456, 2458, 2457, 2681, 3456, 3630

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  5. #73
    Old EV Racer EVcycle's Avatar
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    The last test session before paint. Had a small "stalling" problem that turned out to be a 72Vto12V converter either creating noise or not pushing enough to run the relays/lights.
    That was changed to small battery and the bike has never been faster (so far).

    Final Test.jpg

    Starting the bunout, it is a local IHRA track, not one of the best, but very close to home so it is good for testing.



    Still running 475 of the available 660 amps the controller can provide.
    Last edited by EVcycle; 30 September 2018 at 0500.
    EV Ed
    Never let being a responsible adult get in the way of passion and curiosity.
    Juiced Drag Racing
    Motenergy.com
    Ev album 2456, 2458, 2457, 2681, 3456, 3630

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  7. #74
    Senior Member Ted Dillard's Avatar
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    So, noise. How do you track a problem back to "noise"? I hear this a lot and it's a mystery to me.
    Power in Flux: The History of Electric Motorcycles
    www.powerinflux.com

  8. #75
    Old EV Racer EVcycle's Avatar
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    The Issue
    The bike would "stall" at the line at the hit of the throttle, not all the time, (2 out of the 4 passes) and only when I went to launch.
    Quick reset and all is good. A troubleshooting nightmare when it is intermittent.

    In all good troubleshooting..."What did you do to it last....dummy...."

    The Theory
    A DC to DC converter was added since the last test. During my research of the issue I read that DC to DC converters tend to be noisy
    and since everything is a bit tight on a drag bike I suspected noise transfer could be an issue.


    The Troubleshooting

    I connected a tablet to the SEVCON (great product) and started searching for anything that was fluctuating in voltage.
    The thumb throttle always wandered a bit in output, but now it was all over the place. I unscrewed the DC Converter and moved
    it away from the bike and the throttle output got better. Swapped it out for a small gel cell battery (12oz, 2.3AH) and everything settled out.

    The Proof.
    This past weekends runs proved that it worked. 4 burnouts and passes, no issues. Even got into the 8.5 sec range.

    Now off to paint and decal....as soon as the weather settles out anyway.
    EV Ed
    Never let being a responsible adult get in the way of passion and curiosity.
    Juiced Drag Racing
    Motenergy.com
    Ev album 2456, 2458, 2457, 2681, 3456, 3630

  9. #76
    Senior Member Ted Dillard's Avatar
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    AH I see! (..said the blind man, as he picked up two leads from his pack )

    So the noise isn't RF noise - it's in the circuit, coming directly from the DC/DC - got it - it's like having one of those super-cheap bench power supplies?

    ...sort of?

    ?

    Power in Flux: The History of Electric Motorcycles
    www.powerinflux.com

  10. #77
    Old EV Racer EVcycle's Avatar
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    Quote Originally Posted by Ted Dillard View Post
    AH I see! (..said the blind man, as he picked up two leads from his pack )

    So the noise isn't RF noise - it's in the circuit, coming directly from the DC/DC - got it - it's like having one of those super-cheap bench power supplies?

    ...sort of?

    ?

    Yes!
    EV Ed
    Never let being a responsible adult get in the way of passion and curiosity.
    Juiced Drag Racing
    Motenergy.com
    Ev album 2456, 2458, 2457, 2681, 3456, 3630

  11. #78
    Senior Member Ted Dillard's Avatar
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    "DILLARD! You're EDUCABLE!"

    - Prof Stephen Weber, Philosophy of Religion, after two weeks of confusion and persistent questioning on the nature of the Divine.

    (Actually, a better example is probably a power supply on a cheap stereo, how you can hear the 60hz AC buzz through the speakers.)
    Last edited by Ted Dillard; 30 September 2018 at 0742.
    Power in Flux: The History of Electric Motorcycles
    www.powerinflux.com

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  13. #79
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    HI
    great bike

    As we do not have any 1/4 mile tracks over here in bavaria, may i ask if the track is wettet? Looks like and i wonder for what purpose?

    Greets

    flo

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  15. #80
    Senior Member Stevo's Avatar
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    What dc-dc make was causing the issue? I got the 500w Sevcon dc-dc from Travis and I'm not having any issues like this yet. Just curious. I also have a small vicor dc-dc running my arduino supply and circuits and not having any noise issues from that one either, but it's completely isolated from the Sevcon side.

    Sounds GREAT Ed! Looking forward to the paint job!! Cheers!
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
    Current builds: WORX.VOR.v3.2

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