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Thread: My E-Jato Build

  1. #1
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    My E-Jato Build

    I have had the idea to make an E-Jato for a few months. I recently bought a roller and have finally decided to make it into an E-Jato.

    I started it a few days ago. I picked up some L shaped aluminum from Home Depot and started to make a motor mount. After working on it for a little, I gave up. The aluminum was too thick and heavy to work with. I went to work today and I saw we had a few motor mounts. I picked up a Team Associated B4 motor mount plate.



    I made a template out of clear lexan and drilled two holes so I can mount the motor plate to the Jato transmission case. I then mounted the slipper clutch assembly onto the shaft. I needed to put a small washer onto the shaft because the slipper plate was slightly hitting the motor plate. With the washer, it fits fine.

    After the plate was secure to the transmission, I mounted my gear. For now, I went with a stock Rustler VXL spur. Its a 48 pitch, 83t gear. Then, I mounted my motor, a Mamba Max 5700. To go along with that, I picked up Losi pinion gear, a 48 pitch 25t gear. Everything mounted fine with no problems.

    I noticed the setup was not 100% solid. I decided to make a brace from the motor plate to the chassis. For this I used a piece of scrap aluminum. With the brace, everything feels nice and solid.













    I am now in the process of laying out my electronics onto the chassis. I plan on mounting my ESC next to the servo and my receiver right behind the servo.





    I still have to add a few parts. I messed up cutting my top plate. I cut too close to the antenna mount, so I will be getting another top plate tomorrow. I also want a new set of turnbuckles, I will probably go with the Traxxas red turnbuckles. I will also get black RPM arms instead of the blue. I need a set of tires, body and a battery and it will be ready!

    Let me know what you guys think!

  2. #2
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    I would skip the red turnbuckles...especially with that speed demon. go right for lundsford or jd carbon bro. but other than that a very clean nice looking setup you have started.

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    Quote Originally Posted by FNR156
    I would skip the red turnbuckles...especially with that speed demon. go right for lundsford or jd carbon bro. but other than that a very clean nice looking setup you have started.
    Thanks for the compliment. I am undecided about the turnbuckles still. The only reason why I am leaning towards the red ones is because we have them in stock at work. We carry the Lunsford, but they are out of stock.

  4. #4
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    is that gonna be an electric 2-speed!
    eh...i dont see a problem here

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    Nope, I took 1st gear out. I have heard it shifts into 2nd way to fast, so I am running it single speed.

  6. #6
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    Quote Originally Posted by RobF353
    Nope, I took 1st gear out. I have heard it shifts into 2nd way to fast, so I am running it single speed.
    That gearing may be too much for the single speed and a 5700 motor, Hope it works for you. I agree with the single speed though, less complications due to servo brake and shifting. Get the gearing right and you won't need the 2-speed

    I just did a check on a speed calculator and got these values, based on using 2s lipo and traxxas anaconda tires

    Differential Ratio: 1
    Transmission Ratio: 2.066666666666667
    Other Ratio: 1
    Spur Tooth Count: 83
    Pinion Tooth Count: 25
    Total Voltage: 7.4
    Motor KV: 5700
    Tire Diameter (inches): 3.93
    Tire Ballooning (inches): 0
    Motor Current Draw: 0
    Motor coil Ω: 0
    Spur/Pinion Ratio: 3.32 : 1
    Total Ratio: 6.86133 : 1
    Tire Circumference (inches): 12.35 inches (313.6 mm)
    Total Motor Speed: 42180 RPM
    Vehicle Speed: 71.87 mph (115.46 km/h)
    Estimated Adjusted Speed: 65 mph (104 km/h) - 10% loss
    Effective KV Value: 5700
    KT constant: 0.24 oz-in/A
    Motor Torque: Amperage not specified...
    Final Torque: Amperage not specified...
    Final Power: Amperage not specified...

    I think you got it geared too high.

    I think this would be better using a 16 tooth pinion

    Differential Ratio: 1
    Transmission Ratio: 2.066666666666667
    Other Ratio: 1
    Spur Tooth Count: 83
    Pinion Tooth Count: 16
    Total Voltage: 7.4
    Motor KV: 5700
    Tire Diameter (inches): 3.93
    Tire Ballooning (inches): 0
    Motor Current Draw: 0
    Motor coil Ω: 0
    Spur/Pinion Ratio: 5.19 : 1
    Total Ratio: 10.72083 : 1
    Tire Circumference (inches): 12.35 inches (313.6 mm)
    Total Motor Speed: 42180 RPM
    Vehicle Speed: 46 mph (73.89 km/h)
    Estimated Adjusted Speed: 43 mph (69 km/h) - 6% loss
    Effective KV Value: 5700
    KT constant: 0.24 oz-in/A
    Motor Torque: Amperage not specified...
    Final Torque: Amperage not specified...
    Final Power: Amperage not specified...

    I hope it will work, but with your current gearing expect it to be hot, at the least
    Last edited by crazyjr; 11-04-2008 at 11:50 PM.

  7. #7
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    wow, cool. I like the way you set it up.
    No more money for rc trucks I got 1:1 truck

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    Quote Originally Posted by n3.3d_for_sp33d
    wow, cool. I like the way you set it up.
    Wasn't hard, I used this calculator
    http://www.scriptasylum.com/rc_speed/index.html

  9. #9
    RC Turnbuckle Jr. Desert JATO's Avatar
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    a very nice looking electric jato Rob
    did you try that gearing before ? i mean the 25/83 ?
    i also bought a mambamax5700kv system and it's the
    best of all for the 1/10 scale trucks with nice torque but
    you have to be aware of that gearing might cause some problems , overheating is imminent unless the current cold weather helps reduce the motor temp .

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    The gearing I picked is the stock gearing on a Rustler VXL, so I dont know why it wouldnt work.

  11. #11
    RC Turnbuckle Jr. Desert JATO's Avatar
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    Quote Originally Posted by RobF353
    The gearing I picked is the stock gearing on a Rustler VXL, so I dont know why it wouldnt work.
    that's true, but you changed the motor from villeneon into mamba5700 with mamba esc , the villeneon motor designed to run at high gearing, but the mamba5700 should be at lower gearing unless you're at a very cold place other wise it will develop high temp.
    Last edited by Desert JATO; 11-05-2008 at 09:40 AM.

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    Ok, I will look into the gearing more. I just bought those gears to make sure everything fit ok.

  13. #13
    RC Turnbuckle Jr. Desert JATO's Avatar
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    yes Rob, make sure because overheating will damage
    either your esc, motor or even both.

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    Just got back from ym job. I came home with a new top plate, red turnbuckles, a RPM gear cover for my motor plate, a new 2216 receiver, a receiver box and a carbon fiber shock tower from a Team Associated truck (which I plan to use as a servo mount instead of using the top plate).

    Update with pictures tonight!

  15. #15
    RC Turnbuckle Jr. Desert JATO's Avatar
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    you & need4speed are doing some great job
    wish all best of luck.

    later if want to do some ULTRA VERY HIGH SPEED runs
    i'll let know how to avoid esc & motor toasting

    give a PM 4 that ...

  16. #16
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    Quote Originally Posted by RobF353
    The gearing I picked is the stock gearing on a Rustler VXL, so I dont know why it wouldnt work.
    the vxl can is 3500kvm the 5700 can is 5700 kv. It will kill the motor and possibly the esc with that much gear. If running 2s lipo gear for 45-50'ish and it should run great! drop in a 3s lipo and esc fan for plain stupid speeds

    great looking conversion though!
    Run it, break it, fix it, love it :]=~

  17. #17
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    Quote Originally Posted by DickyT
    the vxl can is 3500kvm the 5700 can is 5700 kv. It will kill the motor and possibly the esc with that much gear....
    that's what i was warning him to watch out for earlier above

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    What gearing do you recommend for my motor?

    Also, any ideas of how to mount a battery?

    Where is the best place to mount my ESC? Close or far from my motor?
    Last edited by RobF353; 11-05-2008 at 07:04 PM.

  19. #19
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    Quote Originally Posted by RobF353
    The gearing I picked is the stock gearing on a Rustler VXL, so I dont know why it wouldnt work.
    I think it is because the gearing in the tranny and the diff are different than the rustler vxl
    No more money for rc trucks I got 1:1 truck

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    n33d, whats your idea on mounting the battery?

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  22. #22
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    Quote Originally Posted by RobF353
    n33d, whats your idea on mounting the battery?
    I am going to use the battery mount you showed me and the battery straps.
    No more money for rc trucks I got 1:1 truck

  23. #23
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    Quote Originally Posted by RobF353
    What gearing do you recommend for my motor?

    Also, any ideas of how to mount a battery?

    Where is the best place to mount my ESC? Close or far from my motor?
    for hot days nothing better & safer than 12-15 pinion gear with 86-90 spur
    if you’re gonna use a 6 cell pack it’s going to be easier for you as they don’t
    require any bigger size, they should be placed in the center with vertical
    position. If this doesn’t work place a plastic or a then wood sheet in the
    middle and also horizontally, place the battery pack over and secure it with
    a velcro strap.
    The esc should be placed any where , the middle battery position, or maybe
    you could find a place for it somewhere near the pipe old location.
    seems very tight place, but you’ll manage to find a good empty side…

  24. #24
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    Quote Originally Posted by RobF353
    What gearing do you recommend for my motor?

    Also, any ideas of how to mount a battery?

    Where is the best place to mount my ESC? Close or far from my motor?
    I would aim for mid 30's to low 40's, on that Here is my setup for my T4
    Differential Ratio: 2.6
    Transmission Ratio: 1
    Other Ratio: 1
    Spur Tooth Count: 87
    Pinion Tooth Count: 23
    Total Voltage: 7.4
    Motor KV: 4600
    Tire Diameter (inches): 4
    Tire Ballooning (inches): 0
    Motor Current Draw: 0
    Motor coil Ω: 0
    Spur/Pinion Ratio: 3.78 : 1
    Total Ratio: 9.83478 : 1
    Tire Circumference (inches): 12.57 inches (319.19 mm)
    Total Motor Speed: 34040 RPM
    Vehicle Speed: 41.19 mph (66.16 km/h)
    Estimated Adjusted Speed: 39 mph (63 km/h) - 5% loss
    Effective KV Value: 4600
    KT constant: 0.29 oz-in/A
    Motor Torque: Amperage not specified...
    Final Torque: Amperage not specified...
    Final Power: Amperage not specified...

    This is not an absolute, but i tryed to get you in the ballpark based on my truck, you tranny ratio is different I got a gearing solution for similar to mine
    Differential Ratio: 1
    Transmission Ratio: 2.066666666666667
    Other Ratio: 1
    Spur Tooth Count: 83
    Pinion Tooth Count: 15
    Total Voltage: 7.4
    Motor KV: 5700
    Tire Diameter (inches): 4
    Tire Ballooning (inches): 0
    Motor Current Draw: 0
    Motor coil Ω: 0
    Spur/Pinion Ratio: 5.53 : 1
    Total Ratio: 11.43556 : 1
    Tire Circumference (inches): 12.57 inches (319.19 mm)
    Total Motor Speed: 42180 RPM
    Vehicle Speed: 43.89 mph (70.51 km/h)
    Estimated Adjusted Speed: 41 mph (66 km/h) - 6% loss
    Effective KV Value: 5700
    KT constant: 0.24 oz-in/A
    Motor Torque: Amperage not specified...
    Final Torque: Amperage not specified...
    Final Power: Amperage not specified...
    Desertjato was right on the guess on pinion, the 15 should get you good speed and decent temps. if you don't have a temp gauge, get one, aim for less than 170 (ESC and Motor) and you will be good. If you get a good deal on a 4600 MM motor, it should be better. A 17 tooth pinion would get you 40 mph, A 3500VXL motor and a 23 tooth would get you there as well. I wish you luck on this project, I really wish traxxas would give us a true electric jato

    edit: I deliberately didn't factor in ballooning, too hard to gauge, but will result in a bit more speed
    Last edited by crazyjr; 11-06-2008 at 03:03 AM.

  25. #25
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    Quote Originally Posted by crazyjr
    ...
    Desertjato was right on the guess on pinion, the 15 should get you good speed and decent temps. if you don't have a temp gauge, get one, aim for less than 170 (ESC and Motor) and you will be good. If you get a good deal on a 4600 MM motor, it should be better. A 17 tooth pinion would get you 40 mph, A 3500VXL motor and a 23 tooth would get you there as well...
    Thank you crazyjr.

    just a little add: in regard to the temp save zone, as long
    as it's under 200F it's o.k because he is runing mamba5700kv and this one will telorate that temp barrier and below.

    if he want to get high speed runs either to have 14.4v 12cell Nimh attached in series or get lipo with only 17-19 pinion and 90t spur to keep cold as possible , this will let
    him reach 60mph no doubt..

    if he would lower the spur or increase the pinion a little more that will absolutely gain him maximum top speed with a risk of burning the whole system or part of it unless cooling
    down it with only high speed passes not bashing.

  26. #26
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    things are getting serious with these E-Jato's... didn't think it will all get this far... Traxxas gona have create new Form for E-Jato's soon...
    If you don't like Nitro, you don't like anything!

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    they won't cause they don't make one, my 2 cents. (hides my jato from these guys!)
    (Got Fuel?) REVO 3.3, Jato 3.3, Rustys Daddy!

  28. #28
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    It honestly would surprise me to hear that there isn't an E-jato in the wings. With all the conversions and desire to have one, Traxxas doesn't really have any choice but to deliver one, or lose out.

    If traxxas wanted to really make a different ST, Make it a changling. Have it setup for conventional layout for low traction tracks, with the ability to flip to X-6 Type (X-factory) layout for high traction and on road type tracks. I'll tell you this, I'd drop my T4 real quick if traxxas did do an E-jato. I really like the Jato setup, I just lack the ability to do a conversion

  29. #29
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    Quote Originally Posted by Desert JATO
    Thank you crazyjr.

    just a little add: in regard to the temp save zone, as long
    as it's under 200F it's o.k because he is runing mamba5700kv and this one will telorate that temp barrier and below.

    if he want to get high speed runs either to have 14.4v 12cell Nimh attached in series or get lipo with only 17-19 pinion and 90t spur to keep cold as possible , this will let
    him reach 60mph no doubt..

    if he would lower the spur or increase the pinion a little more that will absolutely gain him maximum top speed with a risk of burning the whole system or part of it unless cooling
    down it with only high speed passes not bashing.
    I know Castle says it can handle 200*, But i have my own set limits. If something is over 170*, there is a problem to me

  30. #30
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    I run my ejato with the single speed geared 32p 25T pinion and 54t spur and it still feels like my vxl system can be geared faster. I'm in the process of gluing a 2speed in 2nd and then I'm gonna have no problem gearing for speed. I like how you made that brace. I'll probaly do that soon, I run the traxxas lightened chassis and I didn't like the thought of drilling holes in it, but I'll have to take a chance because my motor mount has so much flex in it that I could easily strip gears during accelleration.
    you could easily mount that mamba esc in the rear battery box. I fit my vxl esc in there and it makes for alot cleaner look, especialy with the motor wires passing through the shock tower. P.S. my bl motor only gets slightly hot if not just warm when bashing. great looking chassis, can't wait to see the final turn out
    __________________________
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  31. #31
    RC Turnbuckle Jr. Desert JATO's Avatar
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    Quote Originally Posted by crazyjr
    I know Castle says it can handle 200*, But i have my own set limits. If something is over 170*, there is a problem to me
    just to correct temp limits for that system.
    anyway it's wise from you to build a in initial defense wall
    ( 170F ) so heat wouldn't reach your final defensive wall
    ( 200F ) if i may talk in this way

    it's wise from you do be carful.

  32. #32
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    Quote Originally Posted by crazyjr
    It honestly would surprise me to hear that there isn't an E-jato in the wings. With all the conversions and desire to have one, Traxxas doesn't really have any choice but to deliver one, or lose out.
    still don't think so...they already have the rusty vlx, put a jato body on it...done.

    personally i admire the work everyone is doing to convert their jatos over to electric. I am not that ambitious though. I see a summit and maybe a rusty vlx in my future however my next e project is a PBY Catalina.
    (Got Fuel?) REVO 3.3, Jato 3.3, Rustys Daddy!

  33. #33
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    Quote Originally Posted by Switch_639
    things are getting serious with these E-Jato's... didn't think it will all get this far... Traxxas gona have create new Form for E-Jato's soon...
    I don't think they will, and if they do it will be after I put all my time and money into makeing one. That is how my luck works. If they did make one I would be suprized.
    No more money for rc trucks I got 1:1 truck

  34. #34
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    I have a small update.

    I tried out a battery mount today. I had some extra parts from one of my Tamiya kits. they gave me 2 different battery mounts. I had one extra and mounted it onto my chassis.

    I will update later with pictures.

  35. #35
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    Quote Originally Posted by n3.3d_for_sp33d
    I don't think they will, and if they do it will be after I put all my time and money into makeing one. That is how my luck works. If they did make one I would be suprized.
    wasn't actually thinkin in the region of them making an E-Jato... just an extra forum for all that are making their own...
    If you don't like Nitro, you don't like anything!

  36. #36
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    I went with a different battery mount and it looks alot better. I mounted everything onto the chassis. All I need is a set of tires and a new body.

    Pics soon......

  37. #37
    RC Turnbuckle Jr. Desert JATO's Avatar
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    get a new body reflects it's nature as an "E" truck
    for example avoid any decales with nitro or 3.3 sign,
    also make sure it doesn't got a pipe muffler triming

  38. #38
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    hey Desert... what time is it there? you into Saturday yet?
    If you don't like Nitro, you don't like anything!

  39. #39
    RC Turnbuckle Jr. Desert JATO's Avatar
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    it's aprox. 8 AM now, saturday morning, local time here is GMT +3

  40. #40
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    Quote Originally Posted by Desert JATO
    just to correct temp limits for that system.
    anyway it's wise from you to build a in initial defense wall
    ( 170F ) so heat wouldn't reach your final defensive wall
    ( 200F ) if i may talk in this way

    it's wise from you do be carful.
    Nothing wrong with using that as a guideline, But repeated use at that level could cause shorter life in the motor. Thats why i like the safety margin. Its good to have multiple opinions to draw from

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