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Scale 4x2 and Buggy R/C vehicles This is the place to put your Sand Scorchers, Bajas and other various 2wd offroad R/C's


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Old 04-21-2009, 07:57 PM
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OldSchoolRC1 OldSchoolRC1 is offline
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Default OS's Baja Build Off Pro-4 - FINISHED w/Vid 11/17

Yet another trophy/baja/corr/TORC truck build!

First off, I'm not sure this is the right place for this build. it's 2.2, 4wd and going to be pretty scale, so it could fit in the 2.2 builds...but then again it's semi slash based, and all the slashes are over here, so i guess it kinda fits here. Mods, feel free to place where appropriate.

Ok, on to the good stuff. I'm been having a ton of fun beating my Slash into the ground. Most fun i've had with an RC in quite a while. Nice change from picking lines, just peg the thottle and hang on. I've been having a speed attack lately after speding the winter with my Jero, F350, Monster Mo and Xtrail so it's time for a speedy project. I decided to tackle the true trophy truck formula and build an electric 4wd "slash" with true indy front and solid axle rear. I've seen quite a few of these on the web, both in 2wd and 4wd and indy front/solid rear looks like too much fun not to try.

so, on with the specs:
  • WK axle w/open diff
  • RS4 Evo front gearbox/bulkhead
  • Ofna Ultra center diff
  • RC monster motor mount
  • Velineon motor and ESC
  • homebrew chassis out of 3mm 6061
  • some old duratrax front suspension parts
  • Pro-line HardCorr body
  • plenty of cage work
  • possible interior with driver (depends on if leaning towards performance or looks...debating)
  • Shocks and wheels TBD as budget allows.

plenty of issues to work out here, and a bunch of odds and ends on order. Getting the ofna center diff and f/r drive assemblies talking to each other is the biggest challenge so far. In any case, some initial work done.

first off, laid out the essential parts of the drivetrain


Then, had to make some new diff outdrives for the ofna diff. The old ones had bolt on diff cups, but this newer style has 1 piece cups/diff outdrives. Thankfully, they were 5mm shafts, so I used an old TL01 center shaft and cut and hacked it down and made some new outdrives. Using a maxx shaft in the rear and a pede shaft in the front - I need the smaller shaft to clear the steering draglink up front. Also, while i was at it, filled the diff with 7k silicone, heaviest i had on hand from my nitro days. Not sure how the center diff is going to work out, we'll see how it comes together. May lock it permanantly. The RC monster motor mount was pricy, but oh so pretty and solved a lot of fab time and when it all comes together, should be right around the same ratio overall as a stock slash.







more to come, waiting on a new outdrive for the front diff, should be here tomorrow (I hope) along with a bunch of other stuff. Once that's done, can start mocking up and cutting chassis parts. - comments welcome!

Last edited by OldSchoolRC1 : 11-18-2009 at 06:14 AM. Reason: Name change for Buildoff
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  #2  
Old 04-21-2009, 08:12 PM
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Looks good. Better than i could do.
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Old 04-21-2009, 08:33 PM
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do the front and rear diffs have the same ratio? (or at least dang close)

if not you realize your gonna have some serious problems once you apply power right?


otherwise, looks like a great start.
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Old 04-21-2009, 08:44 PM
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Originally Posted by talon View Post
do the front and rear diffs have the same ratio? (or at least dang close)
Of course! I didn't fall off the hayrack yesterday Great at planning, just suck at execution.

Actually, the RS4 3 Evo gearbox i got has a slightly different ratio for some reason, but will support the WK gears (same as the MTSS, Super Nitro Rally, and the older RS4-3's - gotta love a company re-using parts wherever they can) and the R&P gears in the WK axle are not shimmed and started clicking, so i ordered up 2 fresh sets. That way i know they'll match and are nice and fresh. Probably the 10th set i have ordered over 2 years, brushless and clod sized tires were not kind to my WK axles.

in any case, holding on to those other gears, an overdriven front end/center diff set up might be an interesting tuning tool - off road only of course.
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Old 04-21-2009, 08:51 PM
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opc orn:
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Old 04-22-2009, 09:17 AM
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Quote:
Originally Posted by OldSchoolRC1 View Post
in any case, holding on to those other gears, an overdriven front end/center diff set up might be an interesting tuning tool - off road only of course.
if you decide, OFNA makes a diff lock lube, it's thick as hell. Has the consistancy of paste
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Old 04-22-2009, 09:20 PM
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I have a similar build based off the MT-2 with a Wk rear and HardCore skin. If you haven't already figured it out you will need to run an offset in the rear for the WK to fit the body.

WK and MT2 are suppose to be the same but I think I have seen a higher geared combo. That must be what you got.

Anyways I do see what you say about the gears clicking. Can you or anyone else tell me how to shim a WK axle? Part Number for shims?
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Old 04-22-2009, 09:58 PM
SteveK SteveK is offline
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That's gonna be sweet; I think most TTs have been 2WD since the early 2000s. Same with the solid rear axles, they gave up on independent rear suspensions for travel and durability of solid axles. Makes for pretty boring racing though, all the trucks look the same.

I wish there was more variety, like there used to be.

Do the gear ratios line up front-rear?
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Old 04-22-2009, 11:50 PM
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Quote:
Do the gear ratios line up front-rear?
Acually I'm running the hpi diff in both the front and in the wk axle. I just need to shim it but don't really know how.
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Old 04-23-2009, 04:41 AM
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started working on the front, i pulled the gears out of the RS4 EVO gearbox and dropped in the new WK gears. Check out the gear in the evo....toothed on both sides - makes me wonder if HPI will have a losi set-up at some point?
Ground down the outdrive and drilled it out for the pede shaft, and put it all back together. Added a carbon front suspension tower and was playing with the pinion and motor set-up. Not sure if i like how the motor is sitting in there, might try and flip that around and have it face the front.

put the suspension arms on in the front and do not have swing shafts long enough, have to do some shopping or come up with plan B.

funky HPI gear








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Old 04-23-2009, 04:45 AM
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Quote:
Originally Posted by MojaveMonster View Post
I have a similar build based off the MT-2 with a Wk rear and HardCore skin. If you haven't already figured it out you will need to run an offset in the rear for the WK to fit the body.

WK and MT2 are suppose to be the same but I think I have seen a higher geared combo. That must be what you got.

Anyways I do see what you say about the gears clicking. Can you or anyone else tell me how to shim a WK axle? Part Number for shims?
yes, i have 15mm integy wheel spacers ready to go! should put me close, and then i can play with offset wheels to make up the difference.

you should be able to pick up some shims on tower or whereever and put one or two behind the pinion - just enough so that it does not bind. Really helps keep them fron stripping out, ran brushless in my WK for a while with no issues. As long as they have a 5mm opening in the center, they'll fit. I had a bunch in my parts box from various projects...I believe these are what i have: 5mm shims
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Old 04-23-2009, 06:01 AM
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old school great idea!! oporn:
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Old 04-23-2009, 09:05 AM
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found a pair of bones for the front suspension. Duratrax ST rear dogs are 90mm exactly. Bless tower and their thorough part descriptions!! so looks like the front suspension is a go as is....(hope they fit, the next closest size was 108mm) Thankfully too as i'm running out of $$ and really didn't have a plan b.

going to finish out the front suspension and then it's chassis time!! lots of cutting and trimming ahead.
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Old 04-23-2009, 09:43 AM
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I like where this is going...
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Old 04-23-2009, 12:40 PM
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Mucho coolness so far.
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