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Thread: The Juiced Drag bike progress post

              
   
   
  1. #61
    Senior Member T Rush's Avatar
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    Quote Originally Posted by EVcycle View Post
    After of week of analyzing the first test and Tune here are the final evaluation and results.


    I think Travis's programming was close to being spot on which is impressive considering this combo has not been used in this configuration.
    (That I am aware of.)


    The times seemed low compared to what I was expecting, but in reality were pretty good compared to our previous EV conversions.


    The issues (or perceived issues) were:


    Not enough amps from the batteries.
    We were using our Cycle analyst to give highest amps and voltage drop. It showed only a max of 255 amps,
    We were moving along well, but only 250amps? This turned out to be a programming error (Default) with the Shunt. Once that was corrected we now showed a correct 510 amps.


    Not the expected voltage drop with 510 amps.
    We were only dropping 3 volts (66 to 63) on a nominal pack of 60 volts. We were running 2 - 66V Chevy volt Gen 2 batteries in parallel.
    This combo should give us plenty of amps for the torque needed for drag racing.
    Either something is holding it back or these are REALLY good batteries.
    Turns out that these are REALLY good batteries. I pulled one of the batteries out (52 pounds off the bike) and it ran better and still only dropped to 60.5 Volts.


    Only getting up to 3400 RPM (6000 Redline) at the end of the run..... DUH.. a 3.8:1 gear was not going to cut it. We put in stock gears for testing as I did not want to spend
    big bucks on aluminum gears just to find out we were way off. New gearing coming today to give me 4.4:1 and 4.9:1.



    Funny smell and the bike getting a little bit slower each run.
    Every EV Drag bike we have run stays very consistent with the exception of the first pass to get the batteries "woken up" .
    Turns out the front brake pads were a bit too thick and were rubbing the disk. At first it was not noticed, but as the night went on they
    seated and started to grip more and more. After removal of the caliper, a mechanical adjustment and all is good. Much easier to push around too
    wonder if the new gearing will just smoke the tire loose at the line?
    (heck but then I dont know much about drag race'n)

    I'd love to see more torque and hp curves of eMotors.....any chance you will dyno tune this bike? or is it all seat-of-the-pants?
    (and who is/was this guy with the dyno for eBike tuning? https://www.youtube.com/user/garbizwal/videos )
    Last edited by T Rush; 1 Week Ago at 2041. Reason: I usually don't quote a whole post in my reply if its the very next post, but carried the OP's nice post over to a new page

  2. #62
    Old EV Racer EVcycle's Avatar
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    Quote Originally Posted by T Rush View Post
    wonder if the new gearing will just smoke the tire loose at the line?
    (heck but then I dont know much about drag race'n)

    I'd love to see more torque and hp curves of eMotors.....any chance you will dyno tune this bike? or is it all seat-of-the-pants?
    (and who is/was this guy with the dyno for eBike tuning? https://www.youtube.com/user/garbizwal/videos )
    This has a 7.8" slick so it is doubtful it will break loose,,, other than the burnout before the run.

    This is all a.... educated....seat of our pants project.
    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

  3. #63
    Old EV Racer EVcycle's Avatar
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    Finally made it to our second test session of the motorcycle. Made significant gains and we are now
    knocking on the door of the 8 Second range in the Eighth Mile. Perfect for a bracket racing bike!
    The motorcycle ran flawlessly with turn around times of 20 minutes. Still need gear change or two
    ( maxed at 4500 rpm) and still only running 67 volts. So I expect even more speed over the next month or two.
    Second test 2a.jpg
    Starting the burnout. The wheelie bar is not really needed, but it makes a good mount for the GoPro.
    Second test 3 a.jpg
    Finally painted the fender with the body to follow.... we were going to wrap it but the folks here locally
    looked a bit "Befuddled" with all the curves on the body...
    Second test 1A.jpg
    Racing a "Busa" He whipped my ....ummmm well you know.
    Last edited by EVcycle; 2 Days Ago at 1633. Reason: Grammer
    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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