Oh #%@!! What did I do to my SMC Lipos?

[Metallover]

Might have been the new wheels, in addition to the grass. Are the new wheels bigger/heavier then the old ones?

[_paralyzed_]

did it roll freely after the new wheels were on? I always "kick" my r/c's before I run to make sure they roll nice. Any drivetrain binding puts serious load on the equipment.

Originally Posted by Metallover

Might have been the new wheels, in addition to the grass. Are the new wheels bigger/heavier then the old ones?

About same size, but weight less then the other ones.

Originally Posted by _paralyzed_

did it roll freely after the new wheels were on? I always "kick" my r/c's before I run to make sure they roll nice. Any drivetrain binding puts serious load on the equipment.

Yeah, it rolls fine

Originally Posted by lincpimp

Well, looks like one or more cells in that pack puffed. Most likely due to the the grass putting addl load on them and they could not keep up. Given their specs they should be able to handle a 168 amps cont, but we all know that the specs are sometimes a bit exaggerated. Plus I have no idea what cells are in there, so you may have just got a defective cell, it happens.

4s setups in heavy monster trucks are just not a good idea. I have stressed higher rated packs that those smcs in a revo on 4s, so I can imagine the savage was pushing them pretty hard. The grass was probably just enough to send them over the edge.

Time for some hyperion g3 packs! Go up to 5s, and gear down to a 17t pinion for the same overall speed. 5s seems to be the sweet spot for the MMM/2200 setup anyway. I ran my lst with the mmm/2200 on 4900 5s rhino lipos (70 dollar pack, 20c rated) and it did fine with badlands, geared for 40mph. Not a light truck by any means, and those batteries had no issues keeping up.

Going up in voltage will reduce the amp draw, provided you lower gearing for the same overall top speed.

Theres no way the grass would have put that much strain, considering that i've run the truck with the same batteries on the stock tires with no such issues.

I'd rather not deal with trying to modify/run a 5S pack on a Flux, its not specced for that type of wiring/Lipo.

[lincpimp]

Originally Posted by Freezebyte

Theres no way the grass would have put that much strain, considering that i've run the truck with the same batteries on the stock tires with no such issues.

I'd rather not deal with trying to modify/run a 5S pack on a Flux, its not specced for that type of wiring/Lipo.

Not to point out the obvious, but the lipo did puff. They only puff if they go way under voltage and have a large load placed on them, or they are over stressed past their capabilities.

And running in grass places more load than almost anything else (save maybe deep wet sand or mud).

As ML said, use a 3s and a 2s. Heavy trucks need more voltage dude, not talking out of my ass here (even though it would be cool if I could do that).

[sikeston34m]

Originally Posted by lincpimp

Heavy trucks need more voltage dude, not talking out of my ass here (even though it would be cool if I could do that).

Jim Carey did that on that one movie.

[Finnster]

Originally Posted by lincpimp

Not to point out the obvious, but the lipo did puff. They only puff if they go way under voltage and have a large load placed on them, or they are over stressed past their capabilities.

And running in grass places more load than almost anything else (save maybe deep wet sand or mud).

As ML said, use a 3s and a 2s. Heavy trucks need more voltage dude, not talking out of my ass here (even though it would be cool if I could do that).

I did that once on a dare.. was funny for a bit, then just made my tongue taste funny.

Grass is the worst you can put a pack thru. Lots of people think speed runs are really hard on batts, but they are relatively light duty unless the gearing is v. v. tall.
Hard to imagine it got fragged that easy, then again could be the way you drive it or a bad pack. Eagletrees are invaluable things, as are temp guns. Hot lipos are over worked lipos and soon to be dead lipos. Sry.

[lincpimp]

Originally Posted by sikeston34m

Jim Carey did that on that one movie.

"Let me ass you a question!" I remember that, good stuff!

[_paralyzed_]

Originally Posted by Freezebyte

I'd rather not deal with trying to modify/run a 5S pack on a Flux, its not specced for that type of wiring/Lipo.

It most certainly is. Its speced for 4 THROUGH 6s, that means 4,5 or 6. You've just seen everybody pair their lipos and choose 4 or 6s.

You're into it this far, go up to 6s and reduce your gearing for the same top speed as your 4s setup, everything will run cooler and happier.

I know from running nitros how quick the little engines overheated running in grass, so I mostly avoid grass runs with my electrics. Good Luck!