T maxx hv conversion - RC-Monster Forums

lincpimp · **T maxx hv conversion -** 12.24.2007, 01:52 AM

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).

tashpop · 12.24.2007, 08:18 AM

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

suicideneil · 12.24.2007, 10:49 AM

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.

lincpimp · 12.24.2007, 11:50 AM

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!

sleebus.jones · 12.24.2007, 12:13 PM

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

lincpimp · 12.24.2007, 12:22 PM

Quote:

Originally Posted by sleebus.jones

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.

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!

Quote:

Originally Posted by sleebus.jones

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

That is hilarious

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.

sikeston34m · 12.24.2007, 01:41 PM

Quote:

Originally Posted by lincpimp

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

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?

lincpimp · 12.24.2007, 04:18 PM

Quote:

Originally Posted by sikeston34m

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?

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

lincpimp · **Update time! -** 01.05.2008, 08:19 PM

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:

suicideneil · 01.09.2008, 11:53 AM

Thats an idea that hasne been discussed much, but is worth looking at. feigao sell strong planetary reduction gearboxes that are a direct fit for any normal sized motor with a 25mm mounting pattern.

lincpimp · ***update*** - 01.12.2008, 10:47 PM

Spent a few hours on the tmaxx today and basically have a roller now

Anyway, I have flipped the chassis over for better battery tray mounting, extended the chassis cutouts to make room for the revo center driveshafts. I used the really short revo 2.5 center shaft as the front driveshaft, and used a stock length wheel driveshaft for the rear center. I also modded the aftershock diffs to accept the rcm diff output adapters (drop in fit with the diffs) and the 8mm rcm driveshaft yoke for the diff pinion (required a little grinding for a perfect fit). Then assembled the arms and revo bearing carriers, using revo driveshafts. I also installed a set of blue ofna 17mm hubs.

Next up is to fabricate a set of battery trays (easy) and a motor mount platform (not so easy). I would like to use the rcm revo motor mount, and I have one and have been very happy with its performance and design so far. The only issue is that it may contact the rear center driveshaft, so I need to raise the base of the motor mount, while still retaining a solid mount. I am thinking some sort of bridge actoss the rear chassis cutout, and attaching the revo mount to that. I do not want to add too much weight, so I may make a new lower portion of the revo mount to bridge tha gap.

Heres some pics:

Now for a QUESTION: Does anyone know what linkages to use for steering and rear toe rods, as the tmaxx ones I have are too short. Do I need to buy revo links?

sikeston34m · 01.12.2008, 11:08 PM

Linc, This is going to be an Awesome Conversion!

Is that the modded 1/8th diffs I see peeking out from in between those bulkheads?

lincpimp · 01.12.2008, 11:29 PM

Quote:

Originally Posted by squeeforever

You need T/E-Maxx 3.3 ones. Revo won't work I don't think.

Yep, did some research and found the part#s that i need. Should be 5141 5143 5347 and 5355. That covers the two different length rods and the pivot ball/spacers.

Quote:

Originally Posted by sikeston34m

Linc, This is going to be an Awesome Conversion!

Is that the modded 1/8th diffs I see peeking out from in between those bulkheads?

Thanks Sike, just need to make up a motor mount and battery trays and it should be ready to roll. I will try to get the steering and brake servos hooked up tomorrow, and maybe the bumpers, etc. I just ordered all 8 shocks, 28 bucks inc s/h from fleabay! And I should have the esc and prog card next wed. This project may come together sooner than I planned!

And yes, those are the aftershock diffs hanging out in the stock maxx bulks. This drivetrain looks very solid! Hope it can hold up to the 20xl on 10s!

squeeforever · 01.12.2008, 11:06 PM

You need T/E-Maxx 3.3 ones. Revo won't work I don't think.

squeeforever · 01.13.2008, 12:08 AM

What kind of shocks did you get?