LOSI LST XXL Conversion ideas

[mistercrash]

yes I checked and the power goes to all four wheels, or front and rear axles. The power is equal as I use a center spool, not a center diff. Maybe a center diff would help the rear diff by unloading some of the power to the front end but then I think that by doing that, the front diff might start breaking. If I remember right, I was running the center diff when the front diff blew. I wish there was a way to make this truck 3 pounds lighter But there's not. The LST is heavy because it has some heavy duty components on it. It is tough but heavy. I seem to be the only one having this much trouble with the diff so weight is probably not the problem. I do bash hard but I'm not a maniac and I don't intentionally try to break the truck. My driving is fine, I have a few trophies to prove that I am good enough to win races and championships. I have been lurking at the ERBE and I'm thinking of putting it back to use. Is that desperation or what? I'll keep trying to figure out what the problem is with the LST. Thanks for your input guys.

[_paralyzed_]

Linc said two things in one sentence. He's very full of himself so when he talks he literally spits out words. He's so cute.

Anyhoo, we've nailed down that you use alum. diff cases, but what about diff CUPS? http://cgi.ebay.com/DIFF-CUP-Losi-Mu...item5adaf26ac8

Or atleast the upgraded losi cup with the metal insert? With these alum. cups your output gears should last..........

[mistercrash]

I use the Losi Heavy Duty diff cups with the metal inserts. Are those aluminum cups really better than the Losi HD ones?

[lincpimp]

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...

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]

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

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

[mistercrash]

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_]

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

[mistercrash]

We went out and ran our trucks this morning. It seems to have become a daily occurrence for us, kind of part of our daily routine I forgot how nimble and fast that E-Revo was, even running on 4S. I gotta give it that, it's fast, corners really well, jumps nice and leveled, tracks straight on hard accelerations. I don't know of another MT suspension that works as well. It's a racer, so it's also a bit fragile for the kind of bashing I do. From the sound I heard at the end of the first lipo set, I am pretty sure that I stripped the rear pinion and ring gear. Sheesh! I should change my name to diffkiller.

There's one thing I noticed when I was swapping stuff from the LST to the ERBE. One of the rear wheels has the hex rounded a bit. Not enough to keep from securing the wheel but enough for the hex to spin inside the wheel when gunning the throttle. This might explain why my LST wouldn't track straight under hard accelerations and maybe why I have been blowing rear diffs so often.

[jpoprock]

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]

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.

[mistercrash]

I completely took apart the LST. cleaned and inspected every single part. I replaced whatever was worn and started reassembling it. Even though not much was worn and nothing broken on the drive train, I put new shafts all around and in the middle, new bearings at every corner. I have brand new diff parts to build two new diffs but I'm just missing the sun and planetary gears which haven't come in yet. Once they arrive, I can finish the overall and start using the LST again and see if I still have a rear diff problem.

[JThiessen]

I dont recall your early steps, but did you shim your arms to make sure they dont slide back and forth?

[ZippyBasher]

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>???