Traxxas 4-Tec Conversion
 

Picked up a good deal on a used nitro 4-tec. I told the guy what I didn't need and he lowered the price accordingly. Made me happy as I don't need to find a way to offload the stinky nitro stuff I won't use.

It came looking pretty much like new, except for a little under chassis wear.

First thing I did was lock the two-speed spur into second gear and removed first gear altogether. To lock it, I used the method similar to how I did my Revo wayyy back. A little dremel work, a couple 4mm screws, and a bunch of JB Weld later:

http://scriptasylum.com/forumpics/4tec_1.jpg

Actually, this is V2. V1 had about 1mm of spur wobble that I found unacceptable. V2 was done the same way but more carefully.

I then modded the rear-end a little and make a motor mount out of some 6061-T6 aluminum angle stock:

http://scriptasylum.com/forumpics/4tec_2.jpg

The next two pics show the spur adaptor and optional 45T spur mounted. The 45T is really supposed to be 1st gear, but I made a little spacer (white ring) to make it fit right as 2nd gear.

http://scriptasylum.com/forumpics/4tec_3.jpg

http://scriptasylum.com/forumpics/4tec_4.jpg

This arrangement lets me use pinions ranging from 14T all the way up to around 20T. And they're Mod1.

More updates to follow as I make them. I'm not too gung-ho on this project, but it gives me something to do between doing things to my XT8 project...

Lookin good brian.

Looks good Brian, I know how you feel and bing less than enthusiastic... My 4-tec is just sitting in a box! Maybe it needs a new home?

Anyone want it?

I do like your motor mount Brian, any ideas where/how you will mount the battery?

I wouldnt mind taking it linc. Ill see what I can do with it. Ive got some extra stuff sitting around.

It's not that I don't think it will work well, it's just that it gives me something to work on in between other projects. The weather right now isn't the best for on-road so I have some time.

For some reason, I still have an old emaxx motor mount plate around, so I use that as a template when I dremel out the adjustment slot and shaft collar area. It is a PITA to dremel the slot to be the exact size and arc needed, but not too bad.

I plan on using 3s with a Medusa 36-60-3100 motor. I can technically get a normal ~140mm long pack to fit, but it will hang off the chassis quite a bit. Not only does this look funny, it makes it unbalanced. So, I think I'm gonna get a couple ~1500mAh+ 3s saddlepack size packs and put them in parallel to get the capacity (at least 3Ah) and length I want. I have the whole layout planned out so it's just a matter of looking around. I'm shooting for around 50-60mph so I won't need super heavy duty packs.

Whatcha gonna give me for it?

Depends. As of right now I have some stuff you might want. Ill shoot you a pm in a few.

Unless your talking straight cash?

I put a thread up with pics in the for sale section...

Trades or cash, just Pm me.

Aside from these MA packs, anyone know of a similar lipo that will work?

Max total dimensions I have in my tray area:
100mm X 65mm X whatever.

2 of these in parallel... 3500 mah 25c 3s lipo with 95x35x60 dimensions...

http://www.hobbycity.com/hobbycity/s...5C_Lipoly_Pack

And buy me something nice with the money you saved:lol:

A little more capacity from 2 of these in parallel:

http://www.hobbycity.com/hobbycity/s...y_Pack_w/_Conn

4100 mah 25c 3s with 100x35x56 dimensions.

Little more expensive, like 10 bucks more for the pair:lol:

Honestly ma want 170 bucks for their "stuff". Blows me away.

Thanks, either of those would work fine.

Yeah, I don't understand how MA can charge what they do. They are fast becoming the most expensive lipos you can get. :neutral:

Gotta pay for all of that advertising somehow. Even with their 20% gold member crap (still have to buy a bunch of stuff to get that) they are still double what you pay at HC... At least they sell decent chargers... but those are overpriced too:intello:

Flightpower @ tower is even cheaper - much cheaper no now that there is a clearance sale.