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  1. #1
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    I have the need for speed

    So lately I have been having this urge to drive my car really fast. So I think I am going to get an spc 3s lipo and want a new motor. But would I get more speed with a higher kv motor, maybe 5700kv? What do you guys think. What would it take to hit 55-60 mph.
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  2. #2
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    5700kv should hit that for sure.
    I have that kv motor in my KB rally.
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  3. #3
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    Quote Originally Posted by revoman78 View Post
    So lately I have been having this urge to drive my car really fast. So I think I am going to get an spc 3s lipo and want a new motor. But would I get more speed with a higher kv motor, maybe 5700kv? What do you guys think. What would it take to hit 55-60 mph.
    Hey Revoman, just make one like mine! you Get there with the stock electronics! Just gear it 31/50, and find a verrrryyyyyy looooooong asphalt strip, and put some weight on the front! you'll need it to get those speed!
    Cheer!lol!
    Summit RX8/1550kv-Slash4x4 MM2/2400kv Twin-V Merv.

  4. #4
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    Quote Originally Posted by boilo56 View Post
    and put some weight on the front! you'll need it to get those speed!
    Yea, and maybe hang a wing way out in front (in clean air)
    There are lots of ways to do that. Most are wrong.

  5. #5
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    Quote Originally Posted by photon_trap View Post
    Yea, and maybe hang a wing way out in front (in clean air)
    ...yes, and that too!lol!
    Summit RX8/1550kv-Slash4x4 MM2/2400kv Twin-V Merv.

  6. #6
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    I have a very long road that my house is off of. I will take some pictures of it. What brand of motor would you guys recommend. I want a 380 sized motor.

    I have been thinking that maybe I will sell the stock electronics, but how much are they worth. Then i woukd use the money to buy the sw3 and a new motor.
    Last edited by cooleocool; 05-26-2013 at 04:47 PM. Reason: merge
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  7. #7
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    The end all be all 380 sized(stock length) motor is a "neu 1110 1y". That motor will allow you to do just about what ever you want with gearing. Bit steep at $170, there is a motor that has specs close to the neu but is half the price. All I remember is its an "arc" motor can't remember the numbers. Maybe someone will chime in with them.
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  8. #8
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    Not looking to spend that much on a motor, but thanks for the input. Hey DcFox what motor are you running exactly.
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  9. #9
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    what esc are you using?

  10. #10
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    Quote Originally Posted by revoman78 View Post
    Hey DcFox what motor are you running exactly.
    Castle 5700kv and a Sidewinder S2.
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  11. #11
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    Is it worth the higher center of gravity to get big block.

    Can I get a 5700kv 380 sized motor.


    Here is how much road I have to work with.


    and this much space the other way
    Last edited by revoman78; 05-26-2013 at 02:52 PM.
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  12. #12
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    Never seen a 5700kv 380 can.

    For straight pine speed...the higher cog won't make that much of a difference.
    It will change handling characteristics though.
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  13. #13
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    One of the biggest problems in the Merv is the lack of room you have for a powerful ESC and motor. A 540 can is not the biggest problem, but getting a larger ESC in, makes it kinda crowded under the hood. And if you are able to stuff it all under the hood, you have to find a set of lipos which can deliver enough power.

    A 5700Kv 4 pole with a MMP and a set of 50C 2500mAh SPC lipos is a nice set to get your Merv to crazy speeds.
    More expensive options are the Neu motors. Advantage of those is that they deliver a lot of power from their smaller 380 size can.

    I have a Leopard combo in my Mustang (which has more room under the hood, but has the same chassis as the Merv) which is a rather affordable combo which gets my Mustang quite easily to +60mph.
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  14. #14
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    I took the 1/10 Castle out of my Merv because of the high COG.
    I figured it wouldn't be as much of an issue in the Rally.

    I'm actually considering another 380 can motor for my Merv...but will be replacing the ESC first.
    I know that a better ESC really wakes up the stock 380 motor.
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  15. #15
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    Quote Originally Posted by revoman78 View Post

    Here is how much road I have to work with.
    oooooooo baby ! not like an L.A. parking lot!
    Boy am I jealous
    There are lots of ways to do that. Most are wrong.

  16. #16
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    How much was your leopard system compared the castle sv3 and motor?
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  17. #17
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    The Leopard setup is considerably cheaper than the Castle.
    I couldn't find a 5700kv leopard system to compare though.
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  18. #18
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    Ya I looked and I can not find one either.
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  19. #19
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    His is a 4420kv motor
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  20. #20
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    oooops dah.
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  21. #21
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    Well...your stock 380 motor is a 4000kv... so with that motor and a better esc...you should see a substantial improvement.
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  22. #22
    RC Turnbuckle Jr. Petertje60's Avatar
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    The LBP2845 series comes in a lot of different Kv values. There is one problem; the 4mm shaft. You need to trim that down to 3.175 or increase the bore of your pinions. I paid $50 for my motor and around $75 for the ESC.
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  23. #23
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    That being said...price difference is close enough to be irrellevant.
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  24. #24
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    With stock electronics I have has mine up to 52mph! That's with a 31 tooth pinion and 45 tooth spur on a 3S Lipo! Currently have some stuff on the way in hopes of 80ish. I know it should go faster if I kept it on the ground.

  25. #25
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    Quote Originally Posted by dcfox View Post
    That being said...price difference is close enough to be irrellevant.
    If you mean that compared with the Sidewinder, bear in mind that this ESC can handle more than twice the power.
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  26. #26
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    Your esc is rated for 6s?
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  27. #27
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    What kv in the leopard motor would you recommend. Is the esc waterproof and how many cells can it handle.
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  28. #28
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    Quote Originally Posted by dcfox View Post
    Your esc is rated for 6s?
    Quote Originally Posted by revoman78 View Post
    What kv in the leopard motor would you recommend. Is the esc waterproof and how many cells can it handle.
    The one I use in my Mustang (Leopard WP SC8) goes up to 4S and is waterproof. But you will have problems getting that under the hood of the Merv. I think it's the same ESC as the WP SC8 which a few other brands make.

    If you want nothing but top speed (I'd use a different car for that), I would go for the higher range of Kv values. In the case of the Leopard 2845 series I'd pick a 4700 on 3S or a 3650 on 4S.

    I can't say it often enough: the 2845 series come with a 4mm shaft.
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  29. #29
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    Could I mount it sideways to get it under the hood? I would probably use 4s because i already have two 2s that I could run in parallel.
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  30. #30
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    Quote Originally Posted by revoman78 View Post
    Could I mount it sideways to get it under the hood? I would probably use 4s because i already have two 2s that I could run in parallel.
    If you want 4S, that would be in series.

    "When there is a will, there is a way". I have the MMP sideways in my Summit, but that is smaller. The Leopard is 59mm(L) x 38mm(W) x 34mm(H).

    To give you an idea about the size of the WP SC8, here is it in my Mustang: :
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  31. #31
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    I would recomment the xo-1 motor and speed control. I'm sure it can fit somehow.
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  32. #32
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    Quote Originally Posted by Jimdog View Post
    I would recomment the xo-1 motor and speed control. I'm sure it can fit somehow.
    Jim, don't exaggerate, that is for a 1/7 scale....
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