Traxxas 4-Tec Conversion

[BrianG]

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:



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:



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.





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...

[Takedown]

Lookin good brian.

[lincpimp]

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?

[Takedown]

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

[BrianG]

Originally Posted by lincpimp

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?

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.

[lincpimp]

Originally Posted by Takedown

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

Whatcha gonna give me for it?

[Takedown]

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

[Takedown]

Unless your talking straight cash?

[lincpimp]

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

Trades or cash, just Pm me.

[BrianG]

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.

[lincpimp]

Originally Posted by BrianG

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

[lincpimp]

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

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

[BrianG]

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.

[lincpimp]

Originally Posted by BrianG

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.

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

[SpEEdyBL]

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