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Cars Traxxas car problem

Discussion in 'Cars, Trucks, Boats' started by bigone5500, Jul 31, 2017.

  1. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    Neighbor kid brought this to me but can't get it to run. It's old with an am xtal. Any ideas what to check?

    20170731_171036.jpg 20170731_171120.jpg
     


  2. Tony

    Tony Administrator Staff Member

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    Wow, I have not seen a Mechanical Speed Control (MSC) in YEARS!!! That car just needs an upgrade. Get a good speed control and brushless motor and it should work. I would also highly suggest a new Tx as well. With those MSC's, they arc and those AM Tx's start going NUTS! So that is where I would start. You can find really cheap ESC/Motor combos online all day long. And it looks like it is just a 540 size motor. Oh yea, and the brushes could be worn flat out on that car as well. Yet another reason to upgrade.

    I want to see this run when you get it going!!!
     
  3. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    The steering doesn't work either. I plugged the battery initially and the rear wheels jumped. Then nothing.
     
  4. Tony

    Tony Administrator Staff Member

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    Could be a bad MEC not supplying power to the Rx, or it could be the rx.
     
  5. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    I told him he needs to get a DSMX Rx and transmitter. But then again by the time he gets new stuff to get it going, he could probably get a new car altogether.
     
  6. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    Ok. Not sure what happened. But I'm thinking that the battery is probably bad. I checked voltage before I tried to run it and it had somewhere around 7.8v. It's a 7.2v pack. After some troubleshooting, I decided to check the battery again. Zero...dead. I placed it on my charger and let it charge for about 15 minutes and put around 450ma of charge into the battery. I got around 1 minute of run time from that. As a last resort, I'll set my charger on cycle mode and see if I can get it to revive. The pack doesn't look all that old but looks can be deceiving. As of this post, the charger has been going for 30 minutes and has injected 900 mA of charge. The pack is a 1500mAh pack. I'm thinking 45 minutes and it should be done. I'm also charging it at 2.0 amps in auto mode.

    I'll post back with my findings tomorrow.

    Thanks.
     
  7. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    Coolest thing is he got it at a garage sale for $20.
     
  8. Tony

    Tony Administrator Staff Member

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    Put a 2s LiPo in it. That will give him the run time he needs and the power.

    Those batteries are a pain. They keep a memory and if you do not take great care of them (more than with a lipo), they will die or not charge to full capacity. I have thought about doing a video on those batteries, but not many people are running them anymore.
     
  9. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    So I bought this thing from my neighbor for $25. Maybe I won't regret it.
     
  10. Tony

    Tony Administrator Staff Member

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    get rid of the mechanical speed control and put an ESC on it. Might as well just get a brushless setup for it. Just trust me on this.
     
  11. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    So traxxas said this is a replacement would work. It's the XL-5.

    https://traxxas.com/sites/default/files/KC1761-R01_3018R-XL5_INST_140430-EN.pdf

    Here's the specs:

    Code:
    Specifications:
    Input Voltage.....................................4-7 cells NiMH; 2S LiPo
    Case Size.............................................1.23”W x 2.18”L x 0.75” H
    Weight (#3018R)................................2.0 Ounces / 57 grams
    Motor Limit.........................................15-turns (540 Size) / 12-turns (550 Size)
    On Resistance Forward ..................... 0.005 Ohms
    On Resistance Reverse........................0.014 Ohms
    Peak Current - Forward.......................100A
    Peak Current - Reverse........................ 60A
    Braking Current................................... 60A
    Continuous Current ............................ 15A
    BEC Voltage..........................................6.0 VDC
    BEC Current..........................................1A
    Power Wire ..........................................14 Gauge / 5”
    Input Harness Wire.............................26 Gauge / 9”
    Transistor Type....................................MOSFET
    PWM Frequency..................................1700 Hz
    Thermal Protection...............................Thermal Shutdown
    Single Button Setup..............................Yes
    Low-Voltage Detection.........................Yes (User Enabled)
    Profile Selection:
    Sport Mode (Profile #1): 100% Forward, 100% Brakes, 100% Reverse
    Race Mode (Profile #2): 100% Forward, 100% Brakes, No Reverse
    Training Mode (Profile #3): 50% Forward, 100% Brakes, 50% Reverse
    I want a cheaper version. What do I need to look at on these specs to determine what to buy?
     
  12. Tony

    Tony Administrator Staff Member

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  13. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    [pirate]Arrrggghhh! So which KV will ya be recommendin'?[/pirate]
     
  14. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    That one is out of stock. I'll look some more. I'll bookmark that one too so I can have the 'secret' number at the end.
     
  15. Tony

    Tony Administrator Staff Member

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    The lower the KV, the more torque, the higher the more speed. Depends on what you are wanting out of the car. lol
     
  16. Tony

    Tony Administrator Staff Member

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  17. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    I guess a mid range would be ok. I'll need to get those shocks rebuilt first. It doesn't handle bumps too well right now.
     
  18. bigone5500

    bigone5500 I Support Rc-Help! Rc-Help Supporter

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    Thanks Tony. I'll be orderin' that one then.
     
  19. tntpoof

    tntpoof Member

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    bygone .. if you go brushless in that old school truck you will destroy transmission and drive shafts.. just get a good brushed esc..do not go brushless you will regret it..sorry tony for stepping on your replys
     
  20. Tony

    Tony Administrator Staff Member

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    It's ultimately up to him. I can get brushed motors that are way more powerful than brushless. It's whatever.
     

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