mys brushless setup
 

E-maxx
MMM + Medusa 70mm 2000kv on 6s lipo 5000mha
6.5 tires
17/72 on two speed
Fml chasis

E-kyosho kanai
MM+ ubec + Medusa 60mm 1600kv on 4s lipo 5000mha
4.5 tires
19t pinion/ 46t spur

Are mys brushless setups goods?

do you change something?

yes 60mm 2000kv and 70mm 1600kv

but I have all except Medusa 70mm 2000kv.

So you are ordering a medusa 70mm? Get the 1600kv for 6s.

No I dont, then what configuration can I use?, In fact I have already used the kyosho with the 1600kv and this run well.

I would run the 1600kv with 6s and the 2000kv with 4s

Ok then the two motors on 60mm? , The mm can run with the 2000kv?

Another configuration for the buggy kyosho, I have a KD36 9l, is this good configuration on 4s? with 13t and 46t
regards

Yes the MM will be fine with 2000kv. What motor(s) do you have now?

I have the medusa 60mm 1600kv and the kd 36 9l (copy of feigao 9l) and the escs MM and MMM.

Why is better the 60mm 2000kv than the 60mm 1600kv on 4s, if the two motors obtain top speed 40mph with 15/46 for the 2000kv and 19/46 for the 1600kv??

Help, I need know it, because I need order a new motor

Your motor will run in its maximum efficiency zone with the 2000kv + 4s lipo setup, 1600kv and 4s lipo will be rather slow and need quite tall gearing = heat up the esc and batts possibly.

I would also run the emaxx on 1600kv 70mm motor & 6s lipo, again to keep the motor runnig efficiently and cool. Running it on 2000kv and 6s lipo will need you to gear down alot like you have with 17/12- keep an eye on temperatures of the esc, motor and batteries.

You will likely find that your emaxx transmission gives out before too long, but there are several options to make it more durable, same with the differentials.

Ok, then I am going to buy a 2000kv 60mm medusa, for killing buggy nitros, What gearing I need to use? my spur is 46t and my diffs are 43/13.
With my lipos, 5000mha 4s How much autonomy will I get? My buggy weight rtr is 7,8lb and I am going to use electric brakes.

13-16 tooth pinion will net you anywhere between about 40-50mph roughly, I wouldnt like to say the exact gearing you should run as that will depend on many things like the size of the track, your temps, ambient temps etc etc. I'd check into the buggy/truggy sub-forums and have a look at similar setups for a better idea; Im more of an MT guy than anything else. Run time is another good question, but 20-30 minutes is the norm, again- depends on a lot of things.