Brushless buggy to monster conversion

[possent]

I usually run a buggy tamiya TL01B with genesis pro, 380c 9t, 3s lipo: great setup and no problem with my stock gearing (FDR 7.96).
now i put in a set of monster tires (120mm tall), an adjustable motor mount for the smallest pinion possible (16t), and the FDR now is 9.45. That is the limit.
Result: some problems of cogging starting on tall grass, weaker brakes, due to the size and weight of the tires, but in general it runs very well and very fast, too fast.

Please suggest a lower kv motor for pushing those tires.
my lipo can handle max 50/60amps.
i was thinking about the feigao 380c 13t, could it solve the cogging problem?

[kufman]

It is going to be hard to make this work. Your gear ratio is very low for those large tires. Your rollout calculation is almost 40 mm/rev which is very high (the highest I usually see with sedans is 28 mm/rev). Going to a higher turn, two pole motor will slow things down a little bit, but may not help with the cogging. If you can find a 4 or 6 pole motor that is slow, 2000 rpm/v, you might be able to make it work.

[possent]

i worked again on the adjustable motor mount, and replace the 380c 9t with its brother: the plasma 4400 mtroniks (same as feigao). it's smaller diameter, so now i can go down with a 12t pinion moving the motor back in the motor plate.

pinion = 12
FDR = 12.60
travel x motor rev. = 29.91 mm
7cells theoric speed = 41.08 mph 66.11 kmh
8cells theoric speed = 46.94 mph 75.55 kmh

Solved all cogging problems, also with the heavier 7 or 8 cells gp3300 packs instead of 3s lipos, that were too fast in my opinion.
Since the 12t is the smallest metric 48pitch that i found, i think i can't do better.

[kufman]

Sounds like you got it.

[NitroTXT1]

man tamiya's can handle bl? i always thought they couldn't but congrats on fixing your problem

[possent]

I put the mtroniks sport plus combo in my tl01b last april, 2005.
7/8 cells nimh, and then 3s lipo.
Main problem during this year of use?
Curbs, trees, real cars, and so on. :)

never had major problems with drive train, or chewed spur gears. only broke 2 carbon drive shaft (buy an aluminium if you need it), 4 or 5 chassis, and a couple of whell drive metal axl (can't find something more durable).
chassis are 10$/piece.

i run a tt01 (onroad) with great result also, only a few hop ups needed (ball bearings, aluminiun drive shaft, oil shocks). I usually switch from a 4 cells nimh to 3s lipo setup if i race (friendly) against electric brushed or nitro car.

i know i can't compete with the most advanced and more expensive model as hpi or rc10, but a lot of fun is sure.

[Rtsbasic]

Nice setup, didn't think you'd be able to go down to a 12t pinion on one of them. I thought about converting one of mine to a MT one time, but I decided it looked a bit short to have that look.

Personally I love these cars, they handle brushless perfectly with a couple of upgrades, and you can drive them completely not caring about breaking it, because odds are you either already have a spare (you get spares for these in big packs of branches) or you just plain don't care about the car. I have a 380-8T in mine on 7 cells. Guess another reason I love them is because a TL01 was my first car, and the first car I put a 19t in, a crap mod motor in, and a good mod motor in.

[possent]

New problem: after a 15' run with 8 cell the pinion has started to chew the aluminium spur gear.
The problem, and i was waiting for it, is the two adapter plates the motor needs to be mounted, one fixed (380 to 540 can) and one adjustable.
The motor shaft becomes to short and only 2/3mm of pinion meshes the spur gear.
Two solution:
1) returning to 380c 9t (no adapter plate) and the 16t pinion that mesh perfectly. a little bit of cogging at very slow speed and starting on tall grass.
2) buying a motor with a smaller diameter than 380c 9t can but with similar performances. i was thinking about basic 4200 or 3100 (3100 for 3s lipo) but i don't know exactly their sizes.
any other tips?

anyone got one to sell or trade for a like new feigao 380c 7t?

[Rtsbasic]

PM me on the 380C 7t :)

Another option is a thinner adapter plate, LMT sell one that looks a bit thinner, for 10 euro's.

I'm fairly certain the Lehner Basic motors have the same outside diamater as a proper 540, just they're shorter.

Not really sure there's any nice solution to your problem..maybe the stock nylon gears will hold up better?

[possent]

Chiseled out some plastic from the motor plate to make room for the finned can. now a 13t pinion meshes the entire nylon spur gear.
cheaper solution.

pm sent, rtsbasic