Potoczak

iTrader: (120)

Just wondering if drilling the 17.5mm hole would help on a rear motor??

Teufel Racing

iTrader: (30)

Based on the above and what others have posted,

I'd for sure be looking at a few things.

Check the spur/pinion gear mesh. If it's too tight, or too loose it can be the cause of part of your issue.

Check the slipper. If you're running it locked down or close to it, that there could be a big part of the issue. It'll transfer all the shock and stress right to the tranny gears and drive lines. The slipper's main job is to allow for some slip so that the load forces aren't directly applied to the gears. Like when landing off a jump at full wood or near full wood. If it's too loose, it'll for sure kill the spur.

Tranny case. Could be cracked, could have over heated the plastic and caused there to be too much slop where one or more of where the bearings seat or possibly wallowed out one of the idler shaft spots and may be the cause for the gears themselves to move/chatter just enough to skip[ a tooth or two a is causing the gear to fail. Kind of a long shot on that, but is a possibility. Also check that the tranny case isn't bound up because it's over tightened or cross tightened to the motor plate. If that has been done, it'll likely cause overheating and could soften the gears enough to fail easier. Simple fix is a new tranny case. If you have already checked the tranny case and all checks out/looks good, then make sure it's tightened down just enough to keep the motor plate snug/tightish. May need a little Loctite on the motor plate to keep the tranny screws from backing out. If all that checks out, recheck/reset the slipper.

Rear end shims for antisquat. This is more for the MM setup. Make sure you have the right shims in the right places for the antisquat you want/need. If you have too many shims in the wrong place, it could cause the tranny to sit in the wrong position. Once it's tightened down in the chassis, it could cause to tranny case to flex/warp and cause part or most of the issue you are having.

Driving. If all is set/built right you should be able to land on power and not kill the gears most of the time. Even landing full wood, it should last a while, though it's not good for the car and will eventually fail at some point. Simple solution is to change the way you're landing the jumps by letting off the throttle just a tad before you actually land and then roll back on if possible. Don't land a little off power and hit full throttle the instant your tires hit the ground. The car will like you a lot more for being a bit smoother with the throttle. Might not always be the fast way to go, but could save you some headaches, although there could be times where you have to land on power or at full wood, in which case, if everything is right, it should be able to handle it most of the time.

Drag brake. If you are running a ton of drag brake, that could also be part of the issue, as you have to stay on the power to keep the car from slowing down too much or almost stopping. More so when it's in the air, which makes you have to land on power all the time. It's somewhat extreme to have a tranny gear failure just from too much drag brake, but it can happen. Again like above, if things are built/set up right, it should handle it most of the time, but can be a cause or partial cause for your failures.

mdwaeracer

iTrader: (19)

Something is not put together correctly. I've broken just about everything you can on a buggy, but never had problems with a Trans or diff the way you describe. I would get a new case ,top shaft. Maybe your missing the spacer or you tighten your diff too much. Show us a picture if it happens again.

Enigma R/C

iTrader: (2)

Hey guys thought I would post this link to a video up for anyone interested in seeing the difference in running your battery Inline vs. Sideways in a 2wd buggy. Hope this helps answer some question anyone may have on the subject.

https://www.youtube.com/watch?v=2vhitSrKBeg

MikaR

Nice, thanks for sharing!

dpcardoza

iTrader: (83)

Interesting...I've been running the sideways battery with my 17.5 simply because that is how the previous guy (bought used) had it set up. Planning on giving it a try inline just to see what I prefer.

8RC

iTrader: (7)

Considering putting the 3 gear tranny in my mm 17.5 car. Anyone done this have advice? What all will i need to do aside from just changing the box/removing a gear

mdwaeracer

iTrader: (19)

I asked about that and got no response. I'm interested in a three gear mm as well

katoom007

iTrader: (1)

Ok I am working on my roller that i bought. I got it and noticed that the front body does not have a hole and it does not have a pin. ??? Has the pins on the left and right rear but no front? Is this a mod or just a mishap? Thanks

CaseyD

iTrader: (2)

The previous owner cut it off. When you buy a new front top plate it will have the spot for the body clip. Most of us cut it off, it messes the paint job up man.

katoom007

iTrader: (1)

How do you get it to stay on and not flip up?

ThePanda

iTrader: (68)

most use something like velcro. Actually even with body clips, Velcro is still popular so the body doesn't rattle.

8RC

iTrader: (7)

Keep me posted if you see anything... I'll keep watching the thread cuz I'm planning on rebuilding my stock buggy this week

katoom007

iTrader: (1)

thank you for the help with the body. What is the benefit of the 1 degree aluminmum hubs. ???

Gayosaka

I tried that (before the B5M ones!). The idea was to get more on-power steering from the RB6 on tight astro tracks.
When using the rear-motor 3-gear tranny, fitting is easy but the motor ends up on the wrong side, you have to get it to run backwards. AFAIK, even the best ESC available now don't have a proper "backwards" CW motor setup, you lose all the timing adjustment, it is like running a sensorless ESC. This may be less of a problem on a blinky class though.

So I went one step further and drilled my tranny case in order to have the motor on the correct side. It is not an easy task as you have to shim the slipper shaft precisely (as it only sits on the edge of the bearing) and build a custom tranny spacer. I tried it back to back on my home track but the grip was low (wet astro) and TBH I didn't felt any difference . I will try it again when the weather gets better and the grip comes back. It won't be before april though.
HTH