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  1. #1
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    Single 775 motor?

    Can u run a single 775 sized Summit motor setup on a brushed Emaxx?

  2. #2
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    Yes you can do that, you can even run two if you want to.
    With great brushless comes great responsibility.

  3. #3
    RC Champion trax de max's Avatar
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    personally if your going to make the change from 2x550's i'd go with the dewalt and not the 775.
    Google search trumps Wiki. Refer to user guide.

  4. #4
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    I thought they were too big to run two....What would I need to just run one?

    What is a dewalt? A drill motor??

  5. #5
    RC Champion trax de max's Avatar
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    One is good, two can be run but I think it's too much on the esc, yes it's a drill motor 820 size. Kershaw designs is a popular place for them, with the motor mount
    Google search trumps Wiki. Refer to user guide.

  6. #6
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    Yes... about the same price as a new 775 but much more durable, replaceable brushes, more torque, and can be geared heavier.

    396505-21 - motor
    603754-01 - brush box (need 2, but as replacements only)
    Whatever it is I just typed... could be wrong.

  7. #7
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    I would get the Dewalt, It is a far better motor and lots of people run them so there is lots of info for install help.
    With great brushless comes great responsibility.

  8. #8
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    Is this the right one?

    http://www.kershawdesigns.com/E-Maxx...Conversion.htm

    What else is needed to convert?

  9. #9
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    If I wanted to just do the single 775 Summit motor which motor mount would work? The one for the brushless Emaxx?

  10. #10
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    Quote Originally Posted by Traxxasnoob2012 View Post
    If I wanted to just do the single 775 Summit motor which motor mount would work? The one for the brushless E-Maxx?
    You never specified which E-Maxx version you have ....
    However
    The Kershaw motor mount only works on the older 3906 tranny

    The summit motor mount will fit all the newer E-Revo/E-Maxx trannies, so will the brushless E-Maxx mount
    They use the same gearbox, just different motor mount plates
    Morten SnoopMaxx
    3906 ROCKSTAR Makita
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  11. #11
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    I could be mistaken, but I think the Summit/Revo mounts will not work as they mount the motor on the opposite side of the transmission.
    Whatever it is I just typed... could be wrong.

  12. #12
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    Quote Originally Posted by Jimmie Neutron View Post
    I could be mistaken, but I think the Summit/Revo mounts will not work as they mount the motor on the opposite side of the transmission.
    Still the same gearbox, just a matter of finding the right mount
    The best option would be the brushless E-Revo or brushless E-Maxx mount
    Morten SnoopMaxx
    3906 ROCKSTAR Makita
    c",)

  13. #13
    RC Qualifier Texas Wheelman's Avatar
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    The 775 motor will not fit on the newer grey 3905/3903/3908 E-Maxx transmission with the single motor mount. The motor can is too big and the transmission case gets in the way. It will not fit the dual motor mount either. The E-Revo and Summit have the transmission installed in the frame 180 degrees around from the way the E-Maxx has it, so the motor mounts away from the transmission, with nothing below it to keep it from bolting up.
    It's never too late to have a happy childhood.

  14. #14
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    i dont know what e-maxx you are running. but here is my 3906. http://www.youtube.com/watch?v=xZYDY4xzikY. it does have a aluminum chassy with a e-revo tranny/mount ( i dremeled area to make e-revo tranny fit). im only running a 775 titan. but i believe the dewalt would work in my style. i did take out my differentials, and turn them upside down so there going in reverse direction since the motor is going in opposite direction from a stock e-maxx.
    I'm not krazy. My mother had me tested.

  15. #15
    RC Qualifier Texas Wheelman's Avatar
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    You have the motor mounted like an E-Revo/Summit. On the grey transmission E-Maxx, 3905/3903/3908, it goes on the other way. The OP hasn't specified if he has a 3906.
    It's never too late to have a happy childhood.

  16. #16
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    Quote Originally Posted by Texas Wheelman View Post
    You have the motor mounted like an E-Revo/Summit. On the grey transmission E-Maxx, 3905/3903/3908, it goes on the other way. The OP hasn't specified if he has a 3906.
    i know, he hasn't specified any e-maxx. and if he does have the newer e-maxx. then my post is totally useless. oops sorry. especially after looking at my 3903 tranny. im a little embarrassed.
    I'm not krazy. My mother had me tested.

  17. #17
    RC Qualifier Texas Wheelman's Avatar
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    Quote Originally Posted by ajcar View Post
    i know, he hasn't specified any e-maxx. and if he does have the newer e-maxx. then my post is totally useless. oops sorry. especially after looking at my 3903 tranny. im a little embarrassed.
    It's cool, he might have a 3906 in which case you saved him a bunch of time searching.
    It's never too late to have a happy childhood.

  18. #18
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    does anybody have a newer e-maxx pic with a dewalt in it for refference.
    I'm not krazy. My mother had me tested.

  19. #19
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    Quote Originally Posted by ajcar View Post
    does anybody have a newer e-maxx pic with a dewalt in it for refference.
    Here's the ones I used to do my DeWalt mod.
    http://traxxas.com/forums/showthread...ht=3903+dewalt

    http://traxxas.com/forums/showthread...ll-Electronics

    My DeWalt mod starts on page 2 post 77. In one of the pictures I got a picture of the DeWalt next to the Titan 550.
    http://traxxas.com/forums/showthread...=midnight+maxx

    http://traxxas.com/forums/showthread...ht=maxx+rising

    Here's some other pictures and videos.












  20. #20
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    Thanks for posting all the info for the 820 motor.
    Its exactly what I was looking for.

  21. #21
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    if u run two it will eventually burn out the speed controll. assuming the speed control is a evx-2

  22. #22
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    What gearing is good if you run the titan 775 and spur 68 and with nimh batteries 5000 mah?

  23. #23
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    I'm running 18t pinion with 68 spur in my 3906, (should be similar performance if motor was in a newer e-maxx). it is a 775/evx2 on 4s. I do not speed with it. So i have no idea on top speed.
    I'm not krazy. My mother had me tested.

  24. #24
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    Quote Originally Posted by ajcar View Post
    I'm running 18t pinion with 68 spur in my 3906, (should be similar performance if motor was in a newer e-maxx). it is a 775/evx2 on 4s. I do not speed with it. So i have no idea on top speed.
    Thanks for the reply do you still have the old gearbox that has low and high gear?

  25. #25
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    Quote Originally Posted by Sypsp View Post
    Thanks for the reply do you still have the old gearbox that has low and high gear?
    I do
    In my 3906 with 775 (52/17) That gearbox has steel idlers and the cross pins on the top gears are replaced too


    and I use a bone stock 3906 gearbox in this one, with a 2350kv and 4s geared 52/16
    Morten SnoopMaxx
    3906 ROCKSTAR Makita
    c",)

  26. #26
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    Quote Originally Posted by Sypsp View Post
    Thanks for the reply do you still have the old gearbox that has low and high gear?
    I had the old gear box in it for awhile. With the 775/evx2. I did carefully dremel the motor mount, and fit the 775. Now it is a newer tranny fitted into a aluminum chassy. post #14 above.
    Last edited by ajcar; 07-04-2013 at 02:41 PM.
    I'm not krazy. My mother had me tested.

  27. #27
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    Thanks ajcar and snoopmaxx I have run the e maxx titan 775 spur 68 pinion 20 and 21 and the motor is getting very hot so what is the limit in degress and farhenheit for the titan 775 does the brushed motor have a limit like the brushless?

  28. #28
    RC Champion trax de max's Avatar
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    Try and keep motor/ esc under 150, If you have lipos, keep under 120.
    I aim for under 130 and under 100.
    Using the dewalt and just started on the 30/64 for the 3906. Been running 28/64 for quite a while, Over 2 year.
    Google search trumps Wiki. Refer to user guide.

  29. #29
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    trax de max thanks for the reply could you please tell me why there is a difference if you use lipos in the degress?

  30. #30
    RC Champion trax de max's Avatar
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    The main reason for me is safety, The other reason is performance. Temps effect the performance quite dramatically due to the internal resistance increasing, which effects the discharge rate. Anything electrical that's cool (not cold!) will have better efficiency, than it would while hot.
    and the hotter packs age quicker.
    Google search trumps Wiki. Refer to user guide.

  31. #31
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    thanks man that sounds very logical

  32. #32
    RC Champion trax de max's Avatar
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    Some chargers show internal resistance results, and take notes. The higher it goes the poorer the pack becomes.
    I feel a lot safer knowing the temps, but still check the internal resistance once per fortnight. Maybe twice if I'm walking by the charger.
    To figure out the discharge rate from the internal resistance results is a complicated equation.
    Google search trumps Wiki. Refer to user guide.

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