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  1. #1
    RC Turnbuckle Jr. olds97_lss's Avatar
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    My brushless e-jato conversion

    I've had a 2.5 jato for a long time, at least 10 years. That's the oldest photo I have. Tried selling it a few months back, but got nothing but low ball offers. So, now that I'm seasoned vet with electric (5 whole months), I decided to try converting it to brushless.

    I'm using the motor/esc from my stampede 4x4 vxl. Figure 2wd will make it less likely to overheat. Especially since I'm going to try 2S.

    Upon taking it apart, I noticed the trans was really notchy/gritty feeling. I needed to put a single speed conversion in it anyway, so I tore it all apart. Then found that one of the two-speed pins broke off and had it's way with pretty much every gear in there:


    As for the e-conversion "kit", I bought it off ebay and it came with just the mount and esc/receiver/battery tray from a guy that makes them in Greece. Fit and finish was pretty good. It's a very solid well machined hunk of aluminum. It screws to the trans where the stock plastic brace did and bolts to the chassis near it's front edge to a stock screw hole. I liked that the mount had at least one bolt to the chassis to stiffen things up a bit since pretty much the entire top deck was cut off. I did have to grind a little spot because the slipper cooling fin hit it and wouldn't rotate:




    I have no idea what gearing to use. For what I do, with the 2.5R, I ran relatively low gearing and it was plenty fast, 18/54. It seems that 17/54 doesn't fit, so I ground a hair off the trans to get it to mesh. The single speed trans is geared between what it had with 1st/2nd. Running 2S at full charge and a 3500kv motor will put peak rpm's right at 30k. Guessing I'll be playing around with gearing a bit. I then installed a 20T pinion.
    https://www.youtube.com/c/olds97lss

  2. #2
    RC Turnbuckle Jr. olds97_lss's Avatar
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    I tried figure something out for the roll bar. One of my main issues with the jato when I first got it was I'd frequently snap the rear shock tower off in a crash. I made a roll bar that kind of protected it, but it also connected to the stock roll bar. Many hours were burned making this thing with a vice, torch and pliers. Sooo many bends...





    It has done it's job well for many years and fit nicely under the body. As it is, the shock tower in it has one side cracked that I didn't know about and that was the first one In installed with the roll bar. Prior to that, I had replaced 6 or 7 of them. So, figuring something out is a must.


    After finishing up the rough install yesterday, I ran half a pack through it as a test. Using 54/20 spur/pinion and 2S. Seemed pretty quick and pulled easy wheelies.

    Worked on making a support for the rear tower since I couldn't figure out a good way to mount a hoop/roll bar to it with the battery in the way. Hoping a little bracing will help extend the life of it. I just put in a 6mm post, drilled/tapped the bottom for a 4mm countersunk screw and the top for a 3mm, then ran a steel bar from a plate I made on the rear tower to the post. I didn't connect it to the front chassis upper deck, I figured with it sitting right against it, any force bending the post would push into the chassis deck. Since the chassis deck is more or less floating now, I didn't want to rely on just screwing to it and figured a post was my best option.








    Still waiting on the new receiver. I threw the spektrum in a balloon and taped it up so I could velcro it down for now. I don't get near the range out of it as I do the aftermarket ones. It didn't fit in the pocket on the supplied battery/esc/receiver tray after putting a balloon and few layers of tape on it, so for now, it's velcro'd and ziptied to the steering servo.

    Will try and get some video of it tomorrow. Pretty sure I'm going to need to get some more 2S lipo's so I can run this and my stampede for a couple hours.

    Now I need to clean up my work bench... looks like a bomb went off.
    https://www.youtube.com/c/olds97lss

  3. #3
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Only made it 10 minutes into my first real run and the single speed conversion gear spit out it's teeth. I've ordered a hot racing steel single speed conversion which replaces all gears except the large diff gear. Hoping that holds up just due to it's size, more plastic can take more abuse. Also ordered a set of traxxas steel cvd's. Couldn't find MIP's still available and from what I read, Traxxas makes the better ones anyway.

    2017 0506 E Jato First Run


    It is so weird having reverse on my jato. Have had it as nitro for a decade. lol

    Fried gear:
    Last edited by olds97_lss; 05-06-2017 at 11:25 PM.
    https://www.youtube.com/c/olds97lss

  4. #4
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Replaced the single speed conversion with the HOT Racing steel gears. I didn't get the full set, so the diff is still stock. The traxxas cvd's were a total pain to install. Those tiny e-clips inside the diff cup for the output shafts were horrible to get in. I don't understand why traxxas made them that way vs just using cups that go on like the stock slider yokes.

    Seems to be holding up ok so far though. Have run it repeatedly with a 9000mah 2S and 7200mah 2S lipo. I change the gearing from 20/54 to 20/58. ESC thermaled on me a couple times in the grass, so geared it down a bit. Seems to work ok now.

    https://www.youtube.com/c/olds97lss

  5. #5
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Another video a bit more offroad:
    https://www.youtube.com/c/olds97lss

  6. #6
    RC Turnbuckle Jr. olds97_lss's Avatar
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    And another skate park vid:
    https://www.youtube.com/c/olds97lss

  7. #7
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Skatepark and some running at a local park with my eJato.

    https://www.youtube.com/c/olds97lss

  8. #8
    RC Racer rustlerstein's Avatar
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    How does the speed compare to the nitros? My brother has one and it has been sitting for years

    Sent from my SM-N920R4 using Tapatalk

  9. #9
    RC Turnbuckle Jr. olds97_lss's Avatar
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    I ran my nitro with pretty low gearing as I ran it offroad 90% of the time. The stock gearing was too tall for running in the grass.

    I wouldn't mind if it was a bit faster, but when I tried gearing it a little taller, it would thermal on me running 2S. So I dropped the pinion down a tooth, or increased the spur, can't recall which. Runs cooler now. Would probably do a bit better of I put a fan on the motor. As it is, I only have a fan on the ESC.

    Regardless of how fast it is, I think I've driven it more in the past month or two it's been electric than I did total in the 10 years prior when it was nitro. I've run the thing nearly every weekend for an hour or more at a time since I did the conversion. I fried two steering servos in it last weekend, one at the skate park then another when I was running in the dirt. I think I need to tear it down and look at the steering components. I put a savox 0231mg in it as it's all I had left and it's very sluggish to return to center on it's own. Guessing I may have some excess binding or slop. I upgraded a spare 2075 to metal gears and will probably put that back in it. I haven't had the front end apart in a decade, so could just be worn out bushings or seized bearings.

    Here are a couple more vids since my last posting:
    Last edited by olds97_lss; 07-07-2017 at 06:24 PM.
    https://www.youtube.com/c/olds97lss

  10. #10
    RC Turnbuckle Jr. olds97_lss's Avatar
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    I have more footage from the following day I think, but haven't edited it yet. The tires I had on the rear before were duratrax hatchets which were a much softer compound, but one of the foams split and bunched up, so I put a set of traxxas 2.8" chevrons on it which made it very sketchy in the dirt and even on pavement. They are a much harder compound that don't grip as well. I took apart and made new foams for the hatchets then ran the next day with much better results. I'll post that up after I edit it.
    Last edited by olds97_lss; 07-07-2017 at 06:28 PM.
    https://www.youtube.com/c/olds97lss

  11. #11

  12. #12
    RC Qualifier
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    Nice ! :d
    Bashing is my business.. and business is Good !

  13. #13
    RC Turnbuckle Jr. GeneralPede01's Avatar
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    Nice conversion, I was considering turning a jato into a nasty brushless speedrunner.


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  14. #14
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Pretty sure I posted bad video links before... Included new ones and updated links for the old ones I posted above.


    2017 0901 eJato DekalbSkatepark
    https://youtu.be/dIxKLAobJB8

    2017 0806 eJato Genoa Lime Pile
    https://youtu.be/6iD2UPrn6Ls

    2017 0716 jato Dekalb powerProblem
    https://youtu.be/iiTgzGcoQC8

    2017 0716 jato Dekalb - Katz park skate park bashing
    https://youtu.be/sIKxxhgyUxo

    2017 0709 eJato Rochelle skatepark
    https://youtu.be/51VmSCSjajE

    2017 0709 eJato Rochelle Industrial
    https://youtu.be/vAMXnWyM8As

    2017 0709 ejato Dekalb skatepark
    https://youtu.be/NMGgLVeEbDU

    2017 0704 jato skatepark offroad - Brushless converted Jato bashing.
    https://youtu.be/Ih82QMPmLLk

    2017 0702 brushless traxxas jato at the skatepark
    https://youtu.be/2T4T1drK-A4
    https://www.youtube.com/c/olds97lss

  15. #15
    RC Enthusiast
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    That is sweet!! I have been out of the r/c world for a long time. I miss my Jato!!
    MMMMMMMM I Love The Smell Of Nitro In The Morning

  16. #16
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    So I just did this to my jato and same thing happened with the tranny. I also have the hot racing single speed conversion. I seem to have some binding and the sounds like my gear mesh could be off. The one thing I could not figure out was where the shimms from the kit go. Any advise on that?

  17. #17
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Sorry, it's been too long since I did this to mine to remember how it went together. I haven't had the trans apart since the install of the hot racing single speed conversion install and cvd's. Did you make sure to clean your diff gear teeth out really well? Could have bits of the old teeth stuck in it like mine had.

    None of the gears are bevel gears, so shimming wouldn't affect the mesh really, just pressure on the bearings once you tighten the case screws. When I did mine, I washed all the gears with soap/water and a toothbrush including the diff when I installed the cvd's. Then used axle grease on all the gears when I put it together and it spun pretty freely.
    https://www.youtube.com/c/olds97lss

  18. #18
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    My brushless e jato conversion

    the guy whose friend just received the brushless E, could you let me know exactly what brushless it has ?

  19. #19
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Mine had the traxxas vxl-3s/3500kv system in it and I ran 2S in it. I still have the vxl-3s, but the traxxas motor died on the second 3S run and I replaced it with a castle 3800kv then shortly after a hobbystar 3200kv 3660 sized motor and continued running 3S in it.
    https://www.youtube.com/c/olds97lss

  20. #20
    RC Turnbuckle Jr. olds97_lss's Avatar
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    My photo's aren't showing on my old posts. I changed hosting providers.

    2017/05/05 - Starting point:




    Single speed conversion torched after the first few minutes:


    Replaced it with hot racing steel single speed conversion. Haven't had the transmission apart since.


    2018/05/17 - Better tires a year later:


    2018/09/19 - Castle 3800 after smoking the traxxas 3500:


    2018/11/03 - Found a front brace:


    2018/11/03 - Built some 3S lipo's out of 2S ones I had:
    https://www.youtube.com/c/olds97lss

  21. #21
    RC Turnbuckle Jr. olds97_lss's Avatar
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    2019/02/11 - Increased rear ride height with dubro 2319 rod ends on the shocks, also installed hard anno'd/teflon coated/tini shocks with VG dual rate springs and drilled out VDK pistons to 1/16" and 80wt oil (I think):



    Still bottoms out before the shocks do:


    2019/03/27 - Got some 15mm extensions so the rear was closer to the front in width:


    2019/03/29 - New motor, hobbystar 3660 3300kv:
    https://www.youtube.com/c/olds97lss

  22. #22
    RC Turnbuckle Jr. olds97_lss's Avatar
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    The esc was acting weird the last time I ran it and I forgot about it. Was reminded when I ran it again recently. It would hesitate from 1/4-3/4 throttle when I punched it to launch a ramp or accelerate. Not sure why. I crashed it and busted a rear RPM arm which I'm waiting for, so I decided to put a spare max10 sct esc and hobbystar 3665 3100kv motor in it while I wait. Also bumped the gearing up a bit to compensate for the lower kv from 58/18 to 58/20. I didn't have a 19T.




    Video from last weekend with the vxl-3s in it:


    I showed the cutting out in a couple places, 16 - 19 seconds was the first instance. Guessing the new motor/esc eliminates the issue as I never had that when I ran the system in my stampede 4x4. Pretty sure it's not the lipo's as I'm running the same 3S 50C hobbystar 6200mah packs I use in my 6S trucks and stampede with a blx185/2200kv system in it without issue.

    I forget how fun the eJato is until I take it out. Only works well in short grass or at the skate park though. Would be fun at the grass bmx track I run it, but the grass there is usually too long and it spends most of it's time just spinning the wheels.
    https://www.youtube.com/c/olds97lss

  23. #23
    RC Turnbuckle Jr. olds97_lss's Avatar
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    My latest run. Trying to figure out the hesitation issue... when in doubt, replace everything! lol!

    I had a max10 sct and a couple motors I could use, went with a hobbystar 3665 3100kv. Those replaced the vxl-3s/hobbystar 3660 3200kv. Still running the same 6200mah 3S Hobbystar 50C packs, spektrum receiver and savox 0231MG servo.



    No more hesitation, system seemed to run pretty cool even though I added +2 to the pinion and it was 85F with 80% humidity by the end of the run. Still ran ok even though the esc fan died on me at some point that I didn't know about until I went to swap packs. It seemed to run forever as well. Had 32 minutes on the timer, but I did have a few walks of shame when I flipped it 75 yards away. I had set the punch as low as it would go, but it still liked to flip on me if I got even a little aggressive with the throttle.

    No damage other than the dead fan.
    https://www.youtube.com/c/olds97lss

  24. #24
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Tried running it at the grass bmx track... it was a bit damp as I got there before the dew was burned off, so it pretty much just spun it's wheels the entire time. I'm looking for a new set of high bite tires for the rear. Ran across duratrax stakkers MT (louise MCCROSS) and ordered a set, only to get an email a day later saying they won't be in stock for a month. Now waiting to see if they had a set of the faze MT's as they are a bit more aggressive/open than the trencher 2.8's I'm running.

    Even after spinning it's tires for almost 25 minutes straight, the motor/esc never got above 110F... just wish it would have hooked up more easily.

    Still got a few decent jumps, just took a lot of run up:
    https://www.youtube.com/c/olds97lss

  25. #25
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Perhaps these tires will help with my wheel spin issues in the grass...




    Duratrax Faze MT .5" offset. Similar rim to what I had before, just a bit more open face tread. I tried ordering the stakker MT's, but they ended up being out of stock. Supposed to be 100F+ this weekend, so it will sit until next weekend, maybe longer due to rain.

    I had a set of hatchet's on here originally for a year or so, they got pretty chewed up at the skate park. I'll keep these for grass and run the trenchers on skate park days.
    https://www.youtube.com/c/olds97lss

  26. #26
    RC Qualifier Rocketzx1's Avatar
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    I have the Duratrax Faze ST, they grip insanely well in all off-road surfaces on my rustler VXL. I like them, though they do balloon a bit.


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  27. #27
    RC Turnbuckle Jr. olds97_lss's Avatar
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    I thought about getting the ST's, but kind of wanted the taller ones to give me a little more ride height since I got them for the purpose of running in grass. I was going to bump up the gearing a bit, but I think I'll leave it as is until I run it with these.
    https://www.youtube.com/c/olds97lss

  28. #28
    RC Qualifier Rocketzx1's Avatar
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    They should offer good grip in grass, mine do well.


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