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  1. #1
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    Top speed test with a few different batteries

    I did some speed runs today to test out a couple of different batteries that I have. I hit a new best of 62 mph on 2S! I made no other changes to the truck and I made several passes to ensure consistency. I'm using the Garmin Forerunner 101 for my GPS.

    Combo
    Motor - Castle 1406 5700kv (540 can)
    ESC - Mamba Max Pro
    Tires - Jaco Foams
    Gearing - 43/50

    Results
    57.3 mph with Boost 2S 2450mah 50/90c (in parallel)
    61.9 mph with Thunder Power 2S 2250mah 65c (in parallel)

    So I picked up almost 5 mph just by changing batteries. So for everyone getting a big block, you can see how important it is to choose a quality and high c rating battery. If you had a 30c battery, it would be even worse.

    I tried running my Boost 3S 1800mah 45/55c (in parallel), and they're really struggling to feed this motor. Plus I think one of the cells may be starting to go bad. I would love to have some of the new Thunder Power G8 Pro Force 3S 70/140c batteries, but man they're expensive.

    I also tried lowering the truck as low as it could go and it didn't go any faster, so aerodynamics are not an issue at 60 mph.
    Last edited by Dadx2mj; 07-19-2013 at 09:49 AM.

  2. #2
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    Wow. If youre hitting that on 2s, I'd be interested in seeing what you get on 3s or even 4s.
    Drive. Crash. Fix. Repeat.

  3. #3
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    Thumbs up

    any reason why all the replies to this thread are getting deleted?
    MERV - 3S 23/50

  4. #4
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    Quote Originally Posted by funnya1b2c3 View Post
    Wow. If youre hitting that on 2s, I'd be interested in seeing what you get on 3s or even 4s.
    Yup, I would like to see what it could do with the Thunder Power 3S batteries. I could probably even fit 3 batteries in parallel if needed, if 2 aren't enough. There's room on top of the rear shocks. 4S does not work well, I've already tried it.

    Quote Originally Posted by iDrive View Post
    any reason why all the replies to this thread are getting deleted?
    Traxxas does not allow certain manufacturer names to be mentioned.

  5. #5
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    what jacos were u using

  6. #6
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    Quote Originally Posted by DGarand99 View Post
    what jacos were u using
    Part# 2040.

  7. #7
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    how did u lower the truck and some pictures would be cool

  8. #8
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    Quote Originally Posted by DGarand99 View Post
    how did u lower the truck and some pictures would be cool
    I no longer have it lowered, but all you do is zip tie the rockers together.


  9. #9
    RC Turnbuckle Jr. Petertje60's Avatar
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    You should gear down when using 3S. That might increase top speed.
    Nobody is born with experience

  10. #10
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    Quote Originally Posted by Petertje60 View Post
    You should gear down when using 3S. That might increase top speed.
    I hit 70.1 mph on 3S with 35/50 gearing back in 2011. So to only gain 8 mph by going from 2S to 3S, the batteries are the problem. I wonder if (3) 3S batteries in parallel would provide enough amps for the 540? I'm just not satisfied with 70 mph from this motor. I may have to use the Neu 1112/3D 2400kv on 4S or 6S.

  11. #11
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    If you were only using one 3s and you have another of the same type, you should definitely run parallel
    Drive. Crash. Fix. Repeat.

  12. #12
    RC Turnbuckle Jr. Petertje60's Avatar
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    When you step to a more powerful motor, the batteries not being able to keep up is probably the biggest problem you run into.
    There is a lot of nonsense amongst the specs of lipos, so picking the right ones is important.

    In the end it's all about power and it doesn't make a difference if you use batteries in series or in parallel, the total power you get from them is the same.

    When you take the SPC 2500mAh 2S 50C (IMO one of the best power sources for the Traxxas 1/16 scale cars), you get 125A on 7.4V. That is 925W per battery. Two of them would deliver 1850W, that can be as 125A x 14.8V or 250A x 7.4V.
    I wonder if you can manage to get the full 1850W on the street with a Merv and if so, which speed you can get out of it.

    Lowering the amperage means less resistance and often a more efficient working of your ESC and motor.
    Nobody is born with experience

  13. #13
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    Quote Originally Posted by funnya1b2c3 View Post
    If you were only using one 3s and you have another of the same type, you should definitely run parallel
    I've always ran 2 of them in parallel, I was talking about using 3 of them in parallel.

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