Just bought yeti xl rtr

[BarHarborBasher]

Originally Posted by 02RedWS6TA

That's happened what once maybe twice? Traxxas not only replaced them but got a real fix to the owners. I'd trade my yxl for an xmaxx any day of the week and twice on Sunday. At least people will develop real parts for them.

What if you were one of the (Ones) that's how I felt at first...Except MY problem wasn't as obvious as a burning inferno...BUT TRAXXAS handled it like a trustworthy strong.. mature company..and they already got respect from me for that...

Every company is different ,
I'm sure each one has its strengths !! And individual purpose !! I can defiantly say the Obese XMAXX would have a hard time catching the XL on most mediums... that's my opinion .... especially with my TSM on my XL LOL
And I do believe the Losi XXL 2E is probably more durable but it lacks the relisum that Axial offers...(probably worth it tho)

bottom line hindsight always 20/20...


NO MORE PISSING MATCHES...WE ALL OWN XL'S AND 99% OF US LOVE THEM..

MY PISSING MATCHES WERE JUST FOR PEOPLE TO WAKE UP AND DO MY MOD SO WE CAN ALL BASH IN PEACE NOT REST IN PIECES!!!!!

MY PISSING MATCHES WERE JUST FOR PEOPLE TO WAKE UP AND DO MY MOD SO WE CAN ALL BASH IN PEACE NOT REST IN PIECES!!!!!

MY PISSING MATCHES WERE JUST FOR PEOPLE TO WAKE UP AND DO MY MOD SO WE CAN ALL BASH IN PEACE NOT REST IN PIECES!!!!!

MY PISSING MATCHES WERE JUST FOR PEOPLE TO WAKE UP AND DO MY MOD SO WE CAN ALL BASH IN PEACE NOT REST IN PIECES!!!!!

[47yok]

1 point I think I need to make here.

My problem is with axial for putting a product out that is not ready to do its intended purpose.

The 8 times I ran it.
It was fun. Didn't even beat on it that hard. Only using 4s.

That's why I'm angry at axial.

I can say I had fun with it the 1 week it lasted.



Good news. Enough parts arrived to fix it.

BHB mod has been done to hd bevel gears.

I'm gonna try tonight to start on it.

[BarHarborBasher]

Originally Posted by 47yok

Good news. Enough parts arrived to fix it.

BHB mod has been done to hd bevel gears.

I'm gonna try tonight to start on it.

MAN I'M HAPPY AS YOU ARE TO SEE THE PARTS !!!!

Try to enjoy the XL after the mod !! Don't hold a grudge against the XL... It was just born that way... If the tranny holds together like most people's DO than you will have a place in your hart for the XL again

[McD]

Don't put new gears in an old housing !!!!

Get a new one. The main reason the original straight cut gears didn't last was the plastic isn't strong enough around the pinion. It deflects and deforms and doesn't completely return to the original position causing more heat and slop as it wears.

The modulus of elasticity is too low and the plastic is also too thin around the pinion to handle the stresses.

This was my main point when talking to them last fall. They decided to upgrade the gear set and not address the axle housing. They messed up on the pinion tolerance stack and so now it chews through the problem housing even faster.
My suggestion was to mold the axle housing around a metal cup that would hold the pinion which would spread the stresses to the plastic without costing as much as an aluminum housing. This would have been a small mold change and a cheap stamped steel cup. Fairly simple....




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[47yok]

Front diff is assembled.

No changes other than BHB mod.

It turns nice and smooth.

I'm HAPPY with how it turns.

The next factory bulkhead I gonna try my idea.
Did this one this way cause it works.

Hey BHB maybe there 2 roads to the same place?

When I get it back together it getting the 12 yr old test.
Yup, my girlfriends 12 yr old. Letting him loose on it.
We will see?

Originally Posted by McD

Don't put new gears in an old housing !!!!

Get a new one. The main reason the original straight cut gears didn't last was the plastic isn't strong enough around the pinion. It deflects and deforms and doesn't completely return to the original position causing more heat and slop as it wears.

The modulus of elasticity is too low and the plastic is also too thin around the pinion to handle the stresses.

This was my main point when talking to them last fall. They decided to upgrade the gear set and not address the axle housing. They messed up on the pinion tolerance stack and so now it chews through the problem housing even faster.
My suggestion was to mold the axle housing around a metal cup that would hold the pinion which would spread the stresses to the plastic without costing as much as an aluminum housing. This would have been a small mold change and a cheap stamped steel cup. Fairly simple....




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You are correct to a point.

The actual problem is a lack of backlash.

Straight cut gears need a little.

Helical cut gears on average need .006 to .008 backlash.

To much, they break under load.

To little, makes heat and blows up.

To little from axial.

As a rule of thumb, a little more is better than to little.

To little backlash= maybe a week.

To much= maybe 50k miles.

Axial put gears in housing not designed for it.

[McD]

The slop I was talking about wasn't in the gear mesh it was around the outer pinion bearing which will build more heat & let in more trash and that is why if you don't catch it soon enough the gears die too from the pinion exiting the housing.
If you hear the ticking while accelerating or braking stop immediately its your gear teeth skipping past each other because the pinion is out of position.


Their assumption was that the straight cut and bevel gears needed the same backlash, didn't work.
Also the load vectors are not the same with the two different gears set, one will have more lateral movement and the other will have more axial. They traded a midlife failure mode "that took more time" for an infant failure mode. Where the gears are the first to go.


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[sparwood]

Originally Posted by 47yok

When I get it back together it getting the 12 yr old test. Yup, my girlfriends 12 yr old. Letting him loose on it. We will see?

You'll have to let us know how that goes, I have a 7 and 9 year old and I don't think a slab of solid steel would pass that test with them, they'd find a way to smash it for sure.

[47yok]

Originally Posted by McD

The slop I was talking about wasn't in the gear mesh it was around the outer pinion bearing which will build more heat & let in more trash and that is why if you don't catch it soon enough the gears die too from the pinion exiting the housing.
If you hear the ticking while accelerating or braking stop immediately its your gear teeth skipping past each other because the pinion is out of position.
Their assumption was that the straight cut and bevel gears needed the same backlash, didn't work.
Also the load vectors are not the same with the two different gears set, one will have more lateral movement and the other will have more axial. They traded a midlife failure mode "that took more time" for an infant failure mode. Where the gears are the first to go.


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I agree with you.
But if I can achieve the correct tooth pattern.
Meaning The pinion and ring gear start to look silver shiny on the way in and on the way out. AND in the center of each tooth it's polished chrome. It will live forever.
With that that pattern the heat is marginal given the proper lube.

I can't say right now what the housing will take what heat is generated with a proper tooth pattern.

I can tell you this.

Correct tooth pattern trumps backlash.
Incorrect tooth pattern makes heat.
Incorrect backlash shortens life of gears. They break.

Yeti xl has both problems.



Well its back together.
Front diff spins nice.

This thing was f uped from the day I brought it home.
I'll try it tomorrow when I get up.

[reacttiondc2]

Originally Posted by 47yok

Anybody found bevel cut gears
In a rtr yeti xl?

yes,mine had hd gears from the factory

[sparwood]

Originally Posted by 47yok

Well its back together.
Front diff spins nice.

This thing was f uped from the day I brought it home.
I'll try it tomorrow when I get up.

Well on the bright side, if it still doesn't work I think your solution might be sitting right under it, you can't argue it would probably make you feel better,

[BarHarborBasher]

Originally Posted by reacttiondc2

yes,mine had hd gears from the factory

WOW Really !!! That's a SHAME !!

(HAD) dose that mean they went boom?

[47yok]

Went out an ran a set of packs thru it. Runs ok.
Front diff turns good yet. Transmission is very noisey.
Guess that might be next. Lol.

Good news.
New steer servo and the cc bec set to 7.4 volts.
Has it turning much better. Still waiting for the dhawk
Steering rack. That should help more yet.

Next I guess is camber links. They have a lot of play in them. Gonna wait for a while though.
Spent enough on parts the last week.

[reacttiondc2]

Originally Posted by BarHarborBasher

WOW Really !!! That's a SHAME !!

(HAD) dose that mean they went boom?

the gears didnt fail,the bearing did...i heard it popping and said f it,ran it till i busted an axle cup...ironically that was the longest period of time the car ever ran...drained the packs twice before i hit a boulder and broke the cup

[BarHarborBasher]

Originally Posted by reacttiondc2

the gears didnt fail,the bearing did...i heard it popping and said f it,ran it till i busted an axle cup...ironically that was the longest period of time the car ever ran...drained the packs twice before i hit a boulder and broke the cup

Ya I thought that was the problem too at first...
Then I thought it was because Axial uses soft plastic...
NOPE it was the internal pressure with in that caused the failures...

But if your convinced RUNER.....but the rounded end of the ring gear looks REALLY familiar...

[47yok]

I feel it's the internal pressure also.
It needs backlash or enough room to live.
That is the same thing that mine did. I also had broken spider gears to.
It's the pressure.
I'm gonna try a 4mm wide bearing there instead of the 5mm one. Don't think it's gonna be enough though. If it's not, then the BHB mod. So it lives.

[reacttiondc2]

Originally Posted by 47yok

I feel it's the internal pressure also.
It needs backlash or enough room to live.
That is the same thing that mine did. I also had broken spider gears to.
It's the pressure.
I'm gonna try a 4mm wide bearing there instead of the 5mm one. Don't think it's gonna be enough though. If it's not, then the BHB mod. So it lives.

the spider gear issue came after the dhawk case and modded hd gears so i dont think that part has anything to do with the pressure caused by the hd gears...just underbuilt...i used silly putty this time around...next step will be jb weld...would have just done that this time but i tend to break axle cups so id like to be able to salvage parts between breakages

[47yok]

Not sure why my spider gear broke either.
I'm gonna guess and say pulling wheelies on blacktop up my drive and then power sliding a turn on the stones.
Plus maybe the gear just isn't strong enough.
Not sure. But it's running. Woohoo.
BHB the man.
Just got done jumping it off my 4 ft high rock wall.
They should have named it frog.
Ya know like how but Reynolds called Sally field frog in the movie smokey and the bandit. Can't sit still- always jumping. Lol.

Tonight I'm gonna try and sipe the tire treads.
Maybe get some bite.
Test them dam gears! Woohoo!!




Yeti down again. Driver inflicted. Lol.
Darn oak tree moved on me! Lol.
Frt diff still ok. BHB mod= golden.

And the replacement had set screw on rear driveshaft loosen up. Didn't come out. I noticed rear tires not spinning. Loctite put on. Should be good now.

[BarHarborBasher]

Originally Posted by 47yok

Yeti down again. Driver inflicted. Lol.
Darn oak tree moved on me! Lol.
Frt diff still ok. BHB mod= golden.

That's awesome to hear man !!!
The XL is a blast after the mod...
working on a transmission mod for the idler gear cuz my Brand new perfectly assembled transmission that I JUST assembled has a pressure point 3/4 through the rotation...

If on 6 s that's 4.2volts X 6 cells = 25.2 volts X 2200 K.V = 55,440 R.P.M's
That's means the stock spur gear turns 12,238 R.P.M's... My 3 phase shop router table only turned between 8,000 to 24,000 R.P.Ms and that had a 5/8 HSS steel shank....Not a 5mm.. The spur is 2"5/32 in diameter and weighs almost 52 grams < 2 ounces .. No wonder why I have the 3 bent spur shaft sitting in front of me on a glass table.. I remember that I heard the last batch had a pin hole miss drilled ....I don't know if its safe to order one yet ..that would suck...then again a new one will bend just like the last 3... runner...that's the answer.. I think that's the other reason they installed the cover..so you wouldn't see it wobble lol... Sorry for bitching It just sucks assembling something that doesn't seem right (new)...

And to think the transmission is turning almost 5,900 R.P.M's at the outputs... with a snag every rotation...as well as the load from traction and vehicle friction...
That just made me think.... THE EXTRA DRAG FROM THE HD GEARS PROBABLY HELPED TOAST MY TRANNY('S)...........hopefully my luck changes after my experiment.. Funded by BHB...

[47yok]

As soon the dhawk trans is available let me know.
Mine is so loud I need earplugs.
But it still turns.

Yeti down again. Twice in the same day.
Fixed the a-arm. Now the steer bell crank broke on the right side. Can't fix this till dhawk gets here.
Pic to follow.



Well there it is.

And I'm ONLY on 4s.
What a piece of junk.

They should sell this thing in pieces.
Like a chassis tube and tires.
Everthing else is terrible.

I would like to upgrade camber and steer links. Also rear links to aluminum. But I can't cause I'm still fixing weaker parts.

THANKS HARLEY AND AXIAL!!!!!!
Hope you made enough money off this junk for a vacation. I'm a dumb dutchmen and I know more about engineering than you- butwipe.

Thank god for the LOSI XXL2E.
Loose set screw in 6 packs. I'll take it.

[sparwood]

Originally Posted by 47yok

I would like to upgrade camber and steer links. Also rear links to aluminum. But I can't cause I'm still fixing weaker parts.

THANKS HARLEY AND AXIAL!!!!!!
Hope you made enough money off this junk for a vacation. I'm a dumb dutchmen and I know more about engineering than you- butwipe.

Thank god for the LOSI XXL2E.
Loose set screw in 6 packs. I'll take it.

Did you hit a tree with the Losi as well ?