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TRX4 Speedy

OSRC

I wanna be Dave
Joined
Sep 1, 2011
Messages
4,249
Location
Douglassville, PA
TRX4 #4 is the redheaded stepchild of the fleet. I've 3 more, all set up different (The Puller, The Performer, and the Scaler) and I've never really sorted out what to do with this one. A while back I build it as a "go fast" envisioning a solid axle truck I could bomb around the backyard with. It was a fail, the truck was just too top heavy and barrel rolled at any speed.
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After reading the "why can't a crawler go fast" thread, I've decided to take another look at it. This truck started as a Sport, so it's a single speed - not sure if I want a 2 speed or not. I'm out of BL systems, so a Holmes 12t is what it's got for now. It originally had a Castle 3800 in it, and it was wicked fast. This should tame it down a bit. Chassis chopped by an inch out back and some janky battery tray installed. I'm thinking a Bowhouse might come in handy here. The 'X4 chassis is great for this kind of project since the trans has a relatively high ratio and removing the portals give a decently high gear ratio, plus is has fairly tall cut outs so I can drop the truck down a bit.
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SCX10 V1 axles.... why these axles? Open diffs! If I want any handling at all, open diffs are a must. I had these on before and they work pretty well. I would have liked to keep the stock axles and use SSD portal deletes, but you lose quite a bit of width with them. These keep the width and have large chunky gears. I set it up for the longer Defender WB this time as the shorter sport WB got a bit squirrely as speed.
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Getting those big pumpkins under the chassis takes a bit of work. Rear was a direct fit bit the front was a bit hairy. I put some ball ends through the axle cases and used them as panhard and upper link mounts. It's as low profile as I could get.
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Ignore the Ijit in the TV. Apparently, it's a show about some middle aged loser who spends his entire disposable income on RC trucks. Found the lightest body I could and got it mounted up and it looks great imo. I went with some 2.2's, front 'Pede rims for some extra offset - should help with stability. Not set on these yet, but I do like the look.
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Swapped on some 80mm shocks to get the ride height down. I can't really go further as there's just not enough uptravel with the big pumpkins and the chassis. I think the stance is ok though.
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Lots more to do "thumbsup"
 
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I'm diggin' the outta-the-box thinking on this project - fun to see something different being built!

Looking forward to watching it progress..."thumbsup"
 
Nice rig so far!

You say open diffs. Now you got me thinking about a TRX on AR60 axles.

Sent from my Pixel 7 using Tapatalk
 
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Cool rig man! Those OG axles must have some beef. Front upper link mounts attach higher and closer together on the axle?

How about dual exhausts?

Fun build
 
Hey I recognize that janky battery tray


Sent from my iPhone using Tapatalk
 
Hey I recognize that janky battery tray

I hope that's not something you've designed, I'll feel like an ass. :)

Came on a Sport slider a while ago....whatever it is, the print is splitting down the middle. Soon I'll have 2 micro battery trays!
 
I hope that's not something you've designed, I'll feel like an ass. :)

Came on a Sport slider a while ago....whatever it is, the print is splitting down the middle. Soon I'll have 2 micro battery trays!


Don’t worry, I didn’t think it was special to begin with [emoji23]

I just thought it was kind of funny when I read it


Sent from my iPhone using Tapatalk
 
Swapped out the wheels to a set of Axial beadlocks. They have a similar offset, but are a bit narrower and give the tire a better profile imo.
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I think this is an RPM kit? Not sure, I found it in my SMT stuff. Either way, I made a little styrene tray so it mounts under the body.
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Went with PL Gray Primer.. a little plain I guess but I like it. I think my days of complicated paint jobs are over, I just don't have patience for it anymore.
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Took off the front bumper and added some light pods. Not sure about it yet, I may put the bumper back on.
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No bumpers out back, no need really. Love the stance. :)
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I trimmed the sliders down to match the body. Ish.
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I received the Bowhouse tray, but it turns out it's too low and the upper links hit pretty bad, so the janky tray remains. I did use the rear crossmember though and gained quite a bit of rear travel. The upper links were hitting the stock crossmember. No more!
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I took it for a test spin yesterday and it was way slow...I had the gearing at 15/45 and that gives a FDR of 17.54. I'd like to be closer to Slash range, about 12/13. I'm going to swap in a 16/39 and see if that wakes it up.
 
Small update

I took this out for a proper bash in the back yard. After a few minutes, I realized it was pretty slow overall..I went in to play with the gearing and whoops! I'm a bit dislexic at times and I thought I had put a 12t motor in here. Not so much...
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Swapped to a Tamiya brushed just for testing...better. Wasn't sure if the chassis was up for more power, but it handled it pretty well so I think...
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More power!!! Stripped a 10.5 BL system out of one of my touring cars (my old drag car) and ready to go for round 3.
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I swapped over to some Geolanders on RPM wheels they had a bit more offset. Nothing wrong with the tires I was using, these are just a bit wider overall.
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