tmaxx electric conversion
 

Ok guys after debating with myself for a while ive decided to turn my Tmaxx 2.5 that was purchased for $40 into electric. THE only reason i dont sell and buy an Emaxx is ive looked and found this cheaper than an emaxx off craigslist since brushed with no batteries are around 150 so actually prices to buy that or convert after adding brushless become so close the fun of converting was deciding factor. Here is the list of things i purchased for it so far.
http://www.hobbyking.com/hobbyking/s...arehouse_.html

http://www.hobbyking.com/hobbyking/s...arehouse_.html



http://www.hobbyking.com/hobbyking/s...arehouse_.html
though i will not get the motor or esc until christmas. Next on my list is an emaxx tranny off ebay and then the spur gear parts off tower hobbies. Then ill probably get new differential gears and cvds
here are some pics
http://s1369.photobucket.com/user/Ni...?sort=3&page=1

Looks good so far; you know that they do make conversion kits, kershawdesigns.com
Dan makes really good stuff. I once converted my tmaxx but eventually sold it. It's great stuff. Keep us posted on your progress.

what do you think of the rims just curious what others think cuz ive never seen them before and cant identify them and when i say ive posted more pics just check the photobucket link which im uploading more right now. the body is from a random box of crap that costed my brother $10 which had an xtm nitro excelerator roller in it that we put together. im eventually going to get another body because this one was already cut up and painted like that. Im going to make my own mount because eventually as a career i want to be fabricating metal and cutting custom metal sheapes.
i just looked at the conversion kit but i have the stuff or can get the stuff to do so at the same price but with the ability to mount differently.
well after looking i realized the conversion had steel gears but will it work with the 2.5 tranny which btw im having problems with getting it to work

I made these mounts that will allow you to mount a brushless transmission on a tmaxx chassis.

http://i.imgur.com/SJvAHjX.jpg
http://i.imgur.com/eCWjT9L.jpg
http://i.imgur.com/U2ir0ba.jpg
http://i.imgur.com/497Mkvo.jpg

Those are cool how much for a set. Btw i would have to order off ebay not here. Also what is the largest motor that fits the blue dual motor tranny mount

My adapters are $40.

You can fit a 1515 size brushless motor. ( stock brushless size for the emaxx) They also have just a single motor mount plate.

Ok im going to try to make my own adapter but if i fail ill buy from you

Ok when I ordered the stuff on friday 2-3 day shipping was cheaper than 5-6 day so I got it the stuff apparently arrived at my moms house today but I dont go back until wednesday and even then I only get the battery and servo have to wait till christmas for the rest but I get to setup the motor and esc to make sure it works. Ill be able to have the servo mounted by thursday night btw its a larger than stock servo but ill make it fit supposedly 15kg torque at 12 dollars I figured worth it even at 10kg if it isnt as strong as it says. I dont think I linked the battery but its a 4s that pushes 120a I chose 4 not 5s so that I dont push the cheap motor too hard though may eventually go 5s

If you're going to use the 2.5 trans I suggest you search the Traxxas forums for a mod that I believe was done by snoopmaxx. It involved making the trans forward only but the important part was using 2 gears on the intermediate and 2 gears on the output shaft, instead of just one on each. The gears are regular Traxxas gears and it strengthens the trans a lot which is needed for brushless use. Sorry I don't remember specifics let alone part numbers but this would be the cheapest option as well.

That Kershaw kit is meant for the grey transmission which is totally different from the 2.5 trans. The 3903/5/8 Emaxx trans is the best trans (basically bulletproof) but you need Blazerss' adapters to fit in a 2.5 Tmaxx or 3906 Emaxx chassis. The 3906 Emaxx trans will bolt to your chassis but they have weak points. I'm not sure if aftermarket idler gears and such are still available for the 3906 trans.

Yah i plan on the emaxx tranny and will attempt my own adapters first though ill probably get the slipper assembly and spur from tower hobbies i wanna order it this week before they really get out of stock on stuff considering emaxx trannies are $40 on ebay ill have that after my birthday which is the day before thanksgiving

http://www.hobbyking.com/hobbyking/s...arehouse_.html can someone with a 3903 emaxx tell me if this will fit the dual mount tranny? Ok guys like i said the hobbyking stuff arrived at my moms house i go back there tommorow and get just that night to test and make sure nothing is bad then i dont have access to it untill i get it for christmas and only dry test motor on 4s i have nothing to mount it to so ask questions now about it so i can let you know the answer tommorow and will video the test for you guys

The 3903/5/8 trans and the stock mount is designed for motors with standard 25mm mounting bolt spacing and that are 42mm or less in diameter. The motor you linked is 43mm, 1mm isn't going to make a difference. Larger diameter motors like the 1717 (50mm diameter) can be made to work too but larger pinions and spurs are needed because the larger diameter hits the trans case limiting adjustability.

Cool thanks later ill do a review sorta of the motor esc servo and battery i chose just i have nothing to test in if anyone is looking at getting any of those and wants to know something ask now or wait untill christmas

Ok motor works well battery came balanced at 3.80v per cell speed controller is awesome tho 4s max on a 1/8 esc is low its good enough for this build. The video was taken with a 3s hooked up and heres the video
https://m.youtube.com/watch?v=iVToZh-IEGE

Ok the servo has a ton of torque it dropped right in and turned the wheels of the tmaxx as a roller right now with my tc4 that is a roller with motor and my brothers completely assembled ecx circuit. Im working on the battery mount now and for now it will be in the back for convinience since its one 4s lipo though eventually im gonna mount it on top of the servo for more front traction for hill climbing challenges

Ok build is kinda slow now because my emaxx dual motor tranny is coming from Florida shoulda been here wednesday but shipped wednesday due to bad weather. It should be here tomorow so ill mount it in tomorrow and test ut with a single Titan twelve turn to make sure drivetrain is fine. Oh btw my brother pissed me off because he found a $100 brand new tmaxx converted electric with losi controller and associated mgt tires. Though it is powered by a single Titan 12t which gets hot after each run as we expected but it does move the 10lb truck decently on my shorty lipo. He is getting brushless for Christmas . After i mount the tranny mine will be done except for motor and esc which im gettin for Christmas. Then this build will be done and ill move on to a solid axle mud truck. But i will update this thread on how the motor does and what breaks.

nice so far. I built one 3-4 years ago based on the 2.5 chassis. I used a tmaxx tranny with forward only conversion and robinson racing gears. I used a 1/8 tacon motor and ran it on 4s. If you need any pointers or run into problems ill try to help.

Yah well this thing was used hard when my brother bought it for $60 then he gave it to me for 2 2200mah Nimh batteries because he didnt want it. If i drilled bigger holes in the Trans gears they could almost be plastic bushings. Yet the diffs have no wear at all lol. It woulda costed more for new gears and the forward only kit and a new slipper and spur than i got the emaxx tranny for. Btw i lucked out they run $65-85 and i found this one new for $48. I kinda find more fun in custom work on rc cars than driving them except my pede i love it even tho it is still brushed. I'll prolly use this maxx a lot tho because it is my first big scale 4s rc car. And also i prefer owning more rc cars over owning a couple really expensive ones. Next is a wheely king that I'll put traxxas 2.8 talons on lower it a little for mud bogging. Maybe when my 12 year old brother isnt looking ill steal his 4 screw diffs lol

Ok i believe i've said it but i may ask stupid easy to answer questions because i have no time really to find the answer and here is two. First what is the internal gear ratio of the brushed emaxx tranny. Second not so dumb is since i need spur and pinion for tranny what gearing to start would you guys recommend on a 2100kv motor running 4s.

I have a brushless tmaxx on the original narrow maxx platform. I'm running 4s on a 1950kv and I'm using 19/72 gearing. It's conservative gearing but I'm not trying to set land speed records because it's kinda top heavy. It's fun though

Well there's the original 3906 Emaxx with the trans that will bolt directly into your chassis and then there's the 3905 Emaxx that has the same trans as the brushless 3903 and 3908 models. The 3906 is 1.72:1 in 2nd gear while the 3903/5/8 trans is 1.83:1, which do you have?

I have the 3905 dual motor tranny
Can you give me a speed estimate on it Brandon. Post pics if you want

I'd go with a 65T spur and start out with a 21t pinion and see how it goes from there. The 21/65 combo will be right around 40mph depending on your tire diameter.

If I had to guess, I'd say about 20-25 at best with my gearing. But it's a torque monster. I just finished getting my suspension dialed in a couple days ago and haven't had a chance to run it again with the tighter suspension.
http://i1372.photobucket.com/albums/...ps3um2y7gm.jpg

I had an overly excessive amount of roll with the red springs. I put progressive springs all the way around and ran it around the living room. it's a lot more stable. Now I'm waiting on a nice day to take it out and open it up. I'm still planning on putting a 3.3 suspension on it for the 16.4" width. Right now it's 14.5" wide and I have the original 5.75" diameter tires on it.

Brandon have you ever tried mounting the battery under the motor or does it not fit beacause that is a high center of gravity

Also the motor fits great in the dual motor tranny

Doesn't fit. My esc is on the other side of the motor. I've thought about building a case to mount them underneath

And it appears that the shocks are in the way of mounting the motor lower to the side is that correct

There would be about 1/8" of room between the shock and motor, but it's a 1950kv motor. A 2200kv or 2650kv would fit better because they're not as long. I used the tall motor mount from how2rc because I was gonna put my esc underneath the motor but it doesn't fit

From what I can find the HPI Scream 1950kv is actually 4065 (40mm diameter 65mm long) while a Castle 1515 2200kv is 4275 while the Castle 1512 2650kv is 4268.

In the TMaxx conversion thread there's a UE supermaxx someone converted. They put the esc on top of the trans, motor in the same position as the stock engine and the batteries on either side of the trans. It all managed to fit under a narrow Proline 1950 Chevy truck body too. I like your ide of putting the batteries under the chassis though. You could make a Lexan skidplate big enough to hold the batteries and bolts to where a center skid would on the chassis braces. I did something like that for dual receiver packs on one of my old Maxx trucks.

I just measured mine and it's 73mm long

Holy crap thats a big motor. Is that a tattoo? If you can you could always make your own mount and mount the motor higher towards the top of the spur and put the battery under it

Yeah, I'm thinking about buying a dremel and making my own mounts from now on. I know a guy that has a tig welder for welding aluminum. Aluminum is a soft enough metal that can be bent just can't bend it too sharp or it will break. And yeah I have a sleeve tattoo on my left arm

I didn't think it was longer than a 1515, that's why I did a quick search and grabbed the measurements from a vendor page. Either way only the 1512 2650kv is shorter than your motor. Glad we got that cleared up! Lol

And this is the truck I was referring to in my previous post.

Cool. And Brandon i dont have a dremel what i do it get 1/8th inch aluminum, cut it with a hacksaw, bend it to a 90 degree angle with a vice and hammer drill a 1/2 inch hole for the pinion then drill the other holes mount the motor, mesh the gears and drill through the chassis and bolt it. I did that on my brothers electric tmaxx he bought for $100 so that there was room to put a battery

That's a good looking truck. But I put my truck through the mess. I rip it through parking lots and ride 100' wheelies. That battery pack and the wires coming over the top are too close to the spur gear for my liking.

I do like the battery holders though. Is there a link to get those? I need to lower my center of gravity and I have an idea for those

Just get Velcro straps and bolt them to the chassis

Velcro loses its ability to vel to the cro after awhile. Those are made up words but you know what I mean. I want my batteries secured and protected. I'm gonna try to devise a way to mount them on the bottom of the chassis