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  1. G

    "Copper/nickel sandwich" buses for series connections

    Hello Sir. My sincerest apologies for any misunderstanding. I own Vextrek and I just sent you a private message. Please feel free to contact me directly and we can assemble a battery pack for you. Would love to have you as a customer. Gary Little, Vextrek, Inc.
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    "Copper/nickel sandwich" buses for series connections

    A few pictures of .25mm thick copper sheets spot welded by Vextrek, zinc (Augusta, GA)
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    "Copper/nickel sandwich" buses for series connections

    if you’re located in the southeast USA, Vextrek Inc. can spot weld .25 mm pure copper onto lithium ion packs...
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    Bench Test Results: Molicel P45B - 50A 4500mAh 21700…an extraordinary cell!

    Great information! Love your work. Any idea regarding the maximum safe current for both Molicel cells for short bursts such as 10 seconds (assuming the continuous current remains close to 35A)? Thanks 👍 Gary
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    107mph go kart on 28S/18P pack of Molicel P26A

    Time slip for the event referenced above
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    107mph go kart on 28S/18P pack of Molicel P26A

    Had a blast at a local car show on Saturday. Finally got raise a full-size vehicle. 12.77 seconds at 109 mph in the 1/4 mile. We won. 👍 https://youtu.be/PZ2HjQ9hDJk
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    107mph go kart on 28S/18P pack of Molicel P26A

    Pulling between 600 - 650 A for about 13 seconds at the dragstrip. Assuming 100V nominal, that would be 60 kW to 65 kW of total power.
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    107mph go kart on 28S/18P pack of Molicel P26A

    First few laps at the Lamar County Speedway in Barnesville, GA. We were allowed to race the electric kart against Modern & Vintage 2-cycles and we really appreciated the opportunity. https://youtu.be/Ja7m5saL-pc
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    107mph go kart on 28S/18P pack of Molicel P26A

    Will have to check. It was not much but it was lower. At one point, I believe we got it down to 9mV but it seems to stay wrong 11mV. Really appreciate the info you provided. Love this forum!! 👍
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    107mph go kart on 28S/18P pack of Molicel P26A

    Really pleased with how the Vextrek pack remains well balanced even after wide-open throttle tests in high ambient temperatures. We are using a 28S/18P pack of Molicel P26A cells connected with .25mm pure copper. The pack does not utilize any active cooling techniques and was exposed to 90+...
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    107mph go kart on 28S/18P pack of Molicel P26A

    Thanks. It’s starting make sense now. A few years ago I had a less powerful kart and I remember gearing it for the best 1/8 mile time possible. I was shocked that it actually gave me the best 1/4 mile time as well (at a much lower top speed). That proves you can “coast” to a lower ET just like...
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    107mph go kart on 28S/18P pack of Molicel P26A

    This is great information. Turns out it’s very true. The one time I managed a sub-1.9 second time at the 60 ft. mark, it had a significant impact on the total 1/4 mile time. Thanks so much for the info. Starting to make sense now. 👍
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    107mph go kart on 28S/18P pack of Molicel P26A

    Back-to-Back 1/4 mile dragstrip runs. Made a total of nine passes. Here is the video link …. https://youtu.be/wcwyJr9ciUM
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    107mph go kart on 28S/18P pack of Molicel P26A

    Update: 110 mph but still slow on the 60ft and 1/8 mile times. Will try a 2-to-1 sprocket ration next time. Thanks for all the good advice from this forum. 👍
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    107mph go kart on 28S/18P pack of Molicel P26A

    Now that is what I call “low wind resistance”. Nice!!
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    107mph go kart on 28S/18P pack of Molicel P26A

    Excellent idea. Really appreciate the suggestion. Will do.
  17. G

    107mph go kart on 28S/18P pack of Molicel P26A

    Last week, we were allowed to race against some vintage and modern two cycles at the Lamar County Speedway in Barnesville, GA recently. Really great group of people. They did not have to let us race but seemed interested in the project so they let us run with them. Hopefully will get to run...
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    107mph go kart on 28S/18P pack of Molicel P26A

    :-). Going for 110 mph this week. This is the only crazy thing I do but it’s really crazy 😜
  19. G

    107mph go kart on 28S/18P pack of Molicel P26A

    I think you’re right. Will try again this Thursday and hopefully will lower the ET. In theory, I could get a slightly higher TopSpeed since I was no where close to the maximum RPMs with the other sprocket. Definitely will keep you guys posted. Thanks so much for all the great info on this forum
  20. G

    107mph go kart on 28S/18P pack of Molicel P26A

    Good point. Might try that. Thanks.
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    107mph go kart on 28S/18P pack of Molicel P26A

    Yes sir. Here you go. These times were not so good. Going to try a larger sprocket on the rear axle to improve the lower end acceleration. I am still accelerating at the 1/4 mark so I believe I can keep the same top speed and improve the lower end acceleration.
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    107mph go kart on 28S/18P pack of Molicel P26A

    Cells are connected with .25mm thick pure copper sheets.
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    107mph go kart on 28S/18P pack of Molicel P26A

    Yes sir. It’s actually good to know that not everyone is on Facebook. I need to do the same :-). Here’s the last few seconds of 105 mph run. https://youtu.be/P5kUjMHM3Qs
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    107mph go kart on 28S/18P pack of Molicel P26A

  25. G

    107mph go kart on 28S/18P pack of Molicel P26A

    107 mph electric gokart at the dragstrip…. https://www.facebook.com/247184812650883/posts/985572405478783/?d=n Components: AC-9 motor from HPEVS 1238E controller (650A max) 28S/18P lithium ion battery pack consisting of Molicel P26A cells connected with .25mm pure copper bus bars (pack...
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