T maxx hv conversion
 

Ok, here is my latest project (yeah, like I need another project!)

Have a ton of maxx parts and brushless stuff and want to go Hv with it. So here is my planned setup. Std t maxx chassis with a revo tranny, proline bellcrank steering, 4wd thru some hybrid bulks (maybe), and an interesting powerplant!

I have a feigao 20xl (835kv) and a pair of 2200mah 20c 5s lipos. So figuring 10s lipo thru the motor should get it spinning around 30k rpm. Gear it about 20/40 and leave the 2 speed intact in the revo tranny. Forward only so no reverse servo. Keep the mech brakes too. Thinking of using the great planes hv esc that recently came out with a pixstix adapter.

ESC: http://www3.towerhobbies.com/cgi-bin...?&I=LXRDH3&P=7

So, what do you guys think, worth a damn? Keep in mind I have everything except the esc and a few small parts (not much missing).

got my attention. sounds like a cheap build to complete too so bonas.

If you've got the parts laying around, then why not build it- use it as a test mule for all kinda of crazy setups.

My only issues will be battery mounts, but I think I have that figured out. I am thinking that a modded RCM revo mount will be used as the motor mount. Last time I did a brushless t maxx my mount was the part I did not like, so the revo mount should be better. I was going to use the 20xl in a xfactor based crawler, but I want to try some high voltage setups and I think this will be badass! I also have enought 20c 2100mah cells to do a 12s 2100mah batttery config, but that may be a bit much!:wink:

Hm. How about using this for an ESC?

https://www.unitedhobbies.com/UNITED...idProduct=4691

Not that you'd need 100A at 12S, but the price is right. :) Should be a pretty cool build. A 20XL with that kind of voltage should just give you oodles of runtime.

Man, oodles is the coolest word ever, except for maybe weasel. :)

Sleeb

Yeah, I was thinking of that one at first but then found the great planes one and figured that I would give it a try and let you guys know how it worked, just in case anyone else wanted one!


That is hilarious:yipi:

Weasel is a cool word, wonder how they came up with that word? 2 guys sitting in the woods, one says "hey what is that thing over there?" other guy "dunno looks like a rabbit?" , "thats not a rabbit!" "well, watch wanna call it then?" "How bout a weasel?" "Ok, dude that is a cool word, weasel!" "I know!" We can only guess that is how it came about.

What I wanna know is, Who was the first guy that seen a Calf getting Milk from the Mamma cow, and thought there MIGHT be something good to drink in there? :lol:

Good point, I think his brother thought that eating fish eggs (caviar) was a good idea. Probably something wrong with the whole family!

Update time!
 

Ok got some work done on the chassis today. I have decided to use my spare bombproof torpedo chassis braces. I mated them to a stock tmaxx chassis and made an extension for the rear. I used 6061 al plate and al u channel to make the extension/brace. It added 5.5cm to the length of the stock chassis. Transmission is a tmaxx 3.3 case with revo internals (thanks arct1k). I installed a wide ratio 2nd gear. Steering is a proline setup. Skids, bulks, and towers are all stock, had them laying around! Heres the pics:

http://i206.photobucket.com/albums/b...p/DSCF1778.jpg
http://i206.photobucket.com/albums/b...p/DSCF1779.jpg
http://i206.photobucket.com/albums/b...p/DSCF1780.jpg
http://i206.photobucket.com/albums/b...p/DSCF1781.jpg

Time to do the diffs! I am going to adapt a set of aftershock/lst diffs to the maxx bulkheads. Got the idea from another member here that used muggy diffs (same thing). Found a 1/2' pvc coupler that fits into the bulks well. It is tapered so that it will not be able to come out of the bulk. I need to enlarge the inside diameter to match the aftershock case, and cut the coupler to length so that it takes up the slack between the diff and bulk, as there is a small amount of play. I will also enlarge the inside of the front diff support (stock traxxas part) so that it fits the nose of the diff case. Heres a few pics, including the motor on mike's revo mount and my 2 5s batteries. Yes that is masking tape, I made the packs myself and prefer to use tape over shrink. I may clear shrink over this for even more protection.

http://i206.photobucket.com/albums/b...p/DSCF1782.jpg
http://i206.photobucket.com/albums/b...p/DSCF1783.jpg
http://i206.photobucket.com/albums/b...p/DSCF1784.jpg

Just finished installing the rear diff. Not really diffincult, just time consuming. The pics below should give you an idea of how it was done. Had to cut the pvc coupler to the correct lenght and press it into the bulk by hand. When you have the size correct, enlarge the inside diameter to fit the aftershock diff case. Also make sure that a revo driveshaft can fit thru the outside with some slack, as it will sit inside the pvc slightly. Then when it is in there trim the excess that sticks out flush with the bulk. You will have to cut the notch that is used for access to the driveshaft pin, but it is easy with a hobby knife. The front support has to be ground out on the inside to fit the nose of the aftershock diff case. And it will have to be notched to clear the diff case screws. Lots of test fitting involved, but I did it right the first time, with no redos.

http://i206.photobucket.com/albums/b...p/DSCF1785.jpg
http://i206.photobucket.com/albums/b...p/DSCF1788.jpg
http://i206.photobucket.com/albums/b...p/DSCF1787.jpg

hahaha sweet man! and I love the extended chassis braces!

Its all your fault. Now that my maxx has beefy diffs I can finish it up! I have about 4 other maxx trucks that may get the diff mod too!

Keep up the good work Linc! :yes:

I may be following in your footsteps on this one really soon.

What gear ratio are those diffs? If I recall correctly, they use the 43 tooth spur and are 1/8 size. :yes:

Will the spiral 43 tooth ring and 10 tooth pinion fit these?

Looks like a 8mm pinion shaft with 6mm output shafts. :yes:

Thanks Sike!

The diffs have 43/13 gears, and I see no reason why the hb truggy gears would not work. I have a spare hb diff somewhere I will try it out in the case (factory al cases cost 10 bucks each!).

The 6mm outputs are mike's output adapters. I will run the new emaxx driveshafts you are sending me! pinion is 8mm and I will run a set of mike's adapters to hook up revo sliders as center driveshafts.

The chassis will need to be clearanced so that the rear driveshaft will fit. I may be out of luck with the revo motor mount. I may have to make a different lower mount that will clear the driveshaft. I will take a pic of my proposed setup and we see what it looks like.