LOSI LST XXL Conversion ideas - Page 20 - RC-Monster Forums

lincpimp · 07.26.2010, 10:15 AM

Quote:

Originally Posted by mistercrash

Yes I run the aluminum diff cases, 10K in the rear and 30K in front. Here's the problems I had with XXL diffs. Snapped off drive cups twice, broke teeth on the little spider gears in the front diff once and two times in the rear if I remember correctly. Changed to Thunder Tiger S3 Buggy spider gears that I had lying around in the rear diff. Now it's not the TT spider gears that break, it's the output gears which are the original Losi ones. Looks like the TT spiders are too hard for the Losi output gears. My slipper slips like crazy, I can't even wheely. The LST XXL diffs were very tough in my E-Revo, but the LST weighs about 3 pounds more. The diffs don't seem to like that. I got a set of hardened internal diff gears from Hot Bodies coming in. I bought them even though I don't even know if they will fit. I think they will, at least I hope they do.

Pretty sure the hb hardened gears do not fit. I tried when I built my lst diffs and to the best of my memory they did not fit. The hb diff is wider than the losi, so the internals are thicker.

mistercrash · 07.26.2010, 11:46 AM

Well then I don't know what to do. The rear diff gave out again this morning. Again I was running 4S. I'm completely out of parts for now so I can't repair it. I have been racing and bashing for 25 years but I don't remember having this much problems with diffs. It's a bit sad, after all this work to convert this LST, I don't feel like repairing it right now. There's a problem on that truck but I don't know what it is. Until I can find what the problem is, I don't want to just keep on breaking rear diffs.

JThiessen · 07.26.2010, 01:25 PM

Have you double checked to make sure you are getting power to all 4 wheels? Wonder if maybe your putting all the power to the rears?

Troubling issue...hope you can figure out what it is.

Manne · 06:43 AM

Hm and I who was thinking of getting building a lst due to the revo´s diff problems...seems to me like we need the manufactors to re design the diffs in the most Mt´s, beef them up a bit.

Nice mudding

lincpimp · 07.27.2010, 09:50 AM

Not sure, I use both, but not in the same truck. My LST2 that has seen alot of jumping and bashing has the nova rc al cups. I used the HD cups in the center and rear of the muggy. Never had the output breaking issues that you have with either. The al cups will not flex at all, and that might give you that "extra little bit" of strength that you need...

07.27.2010, 11:28 AM

i don,t know if it is normal, but on my LST2 diffs, if i hold the diff in one hand, and with the other hand i take the pinion and try to move it up/down and left/right, i can see the outer bearing move slightly in the diff case.

ZippyBasher · 07.27.2010, 12:51 PM

Quote:

Originally Posted by david lamontagn

i don,t know if it is normal, but on my LST2 diffs, if i hold the diff in one hand, and with the other hand i take the pinion and try to move it up/down and left/right, i can see the outer bearing move slightly in the diff case.

Yeah I noticed this as well. My drive cup (pinion) moves up down and sideways about 1-2mm inside my diff case. I thought I had a bad bearing, I havent torn into it or looked very closely. Its the case? Anyone else notice this? is there a easy fix? This is just asking for my ring gear to strip out.

CRASH - Maybe you could try the 8ight bevel gears. I think they seem to be made of a better metal. Just looked more clean and beefier when I compared the LST spiders next to the 8ight spiders while building a CD... Might be worth a shot.

LST- http://www.amainhobbies.com/product_...l-Gear-Set-LST

8ight - http://www.amainhobbies.com/product_...Gear-Shaft-Set

07.27.2010, 01:16 PM

When i see this, i,ve change my bearing, but the problem still present.

mistercrash · 10:16 PM

My solution for now is to put the LST to rest for a while. I have no choice, I'm completely out of diff parts. I'm going to think about those aluminum cups and also the 8ightT gears. Although the 8ightT gears look identical to the LST but that's just from crappy pics on A Main.
The MMM is back in the ERBE for now, I'll be running that until I make a decision about this LST. I'll tell you one thing, that ERBE better break more often than the LST did or else I'll go back to being a Traxxas boy.

_paralyzed_ · 07.27.2010, 10:34 PM

Quote:

Originally Posted by mistercrash

I'll tell you one thing, that ERBE better break more often than the LST did or else I'll go back to being a Traxxas boy.

Heavier trucks are just harder on stuff. I've been eyeing up that Losi Ten-T like it was Lincpimp in a dress on roofies. Yeah, I want it that bad.

I think tenth scale(revo) and Losi are the way to go. Perfect balance of size/weight/chassis room/stout drivetrain.... I'm rambling.

The whole point to this thread is that we need your silly french behind here at RCM. PLEASE do not become a traxxas fan boy again

jpoprock · 07.29.2010, 08:54 AM

Ray, your rear hex being stripped could be the problem. But despite your being anal about the slipper, I still feel like this is where the problem is. I was blowing rear diffs like mad in my E-LST2 on 6s, and finally went with the HD diff and haven't had any problems since. It's not normal to strip diffs as fast as you do.

You may want to take a look at your rear wheel bearings. I had one blow and didn't notice. Also, advice that YOU gave me.... Sometimes it's hard to see a broken pinion tooth. In my case. My teeth weren't broke, but 3 of them had flattened a bit, and weren't meshing. Took me three tear downs to notice that! Replaced the pinion and all is well.

How much does your truck weigh fully loaded? I'm starting to wonder if it's just too heavy. But my money is on the slipper. I had mine where I thought it should be, and it wasn't enuff. So put it to where it should be, then go another 1/2 turn out and try that!

And like you, after spending so much time with my LST then switching to my ERBE...it was a very nice surprise. The ERBE is a fierce serpent, where as the LST is a bear!

mistercrash · 10:35 AM

For now, I am running the ERBE. I have lots of diff parts for it

With a pair of 5800 mah 3S lipos and the LST wheels and tires, the truck weighs close to 14 pounds. It weighs a little less with the Proline 40 series Mashers but not much. I use the Hot Racing heavy duty double slipper and if I give it 1/8 of a turn more, the truck won't even move

I ordered some new parts for the LST diff. When they get here, I will sit down and take out the rear end. I will take it all apart and clean and inspect every part, replace all the bearings, put two new CVDs, put a brand new complete diff in and then I'll see what happens. I'll probably take the whole truck apart and overall everything while I'm at it.

ZippyBasher · 08.02.2010, 11:08 PM

One question I had was. Were you replacing gears into the same Diff cup? Or a Completely new diff each time? Only wondering if the cup itself is twisted...

So ReAssembled with stock parts or>???

mistercrash · 08.03.2010, 10:59 AM

Yes my arms are shimmed and everything else also to get rid of as much slop as possible. I used the same cups after inspecting them thoroughly. So I get your point there that it might have been part of the problem. This time, absolutely all the diff parts will be new. If this solves the problem, it will be a good example that cutting corners to save some money isn't always beneficial. The diffs will be reassembled with stock LST XXL parts.

mistercrash · 08.05.2010, 11:57 AM

I'm still waiting for the internal diff gears but yesterday I received the 5 mm Lunsford titanium steering turnbuckles I also ordered. I was still using the stock ones and they were often bending. Now instead of bending the turnbuckles, I'll probably break the steering uprights

The ball ends had to be drilled to 4.2 mm in order to be able to screw them on those massive turnbuckles.