which motor for speed on 3s lipo - RC-Monster Forums

riverat1540 · **which motor for speed on 3s lipo -** 04.21.2007, 06:24 PM

i currently have a feigeo 380c 6L (4899kv) and was wondering if the mamba 5700kv would be an upgrade for more speed. please give explanation if possible to your responce

04.21.2007, 06:32 PM

I'm going to assume that you are using a Mamba Max esc. The 5700 would be somewhat of an upgrade. It's simply by virtue of the fact that the 5700 turns more rpms per volt than the feigao motor and the 5700 has the torque to be geared. On 3S lipo, assuming 3.5v per cell under load, the feigao will turn about 51,500 rpms. The mamba motor will turn about 60,000 rpms on the same voltage. Are you running this in a 1/10th scale? The fastest readily available system is probably a Mamba 4600 on 4S.

riverat1540 · 04.21.2007, 07:04 PM

thanks angel thats what i was thinking just wanted another opinion

riverat1540 · 04.21.2007, 08:55 PM

Quote:

Originally Posted by AAngel

I'm going to assume that you are using a Mamba Max esc. The 5700 would be somewhat of an upgrade. It's simply by virtue of the fact that the 5700 turns more rpms per volt than the feigao motor and the 5700 has the torque to be geared. On 3S lipo, assuming 3.5v per cell under load, the feigao will turn about 51,500 rpms. The mamba motor will turn about 60,000 rpms on the same voltage. Are you running this in a 1/10th scale? The fastest readily available system is probably a Mamba 4600 on 4S.

what about the fiegeo 380c 7t its just a bit more kv than the 5700 but would it work. this seems to me the fastest option on 3s i can find by not pushing the limits too far. im thinking i would be ok

04.21.2007, 09:53 PM

What's the max rpms of the motor? The 5700 is getting pretty close for the max motors, but I think the max for the feigaos is lower.

hyperasus · 04.21.2007, 10:38 PM

What are you running the motor on? For 10th scale trucks I always say go down in kv. Kind of depends on what you are running it in though. If it is a lightweight onroad car with tiny little wheels then you will want a different motor then say a Stampede or Rustler. If it's the pede or rustler you are running then you need to go down in kv, not up.

riverat1540 · 04.22.2007, 10:57 AM

i ordered the mamba 5700kv motor and hope to enjoy it on 3s. iwont be running it all out but its nice to have some extra power behind the trigger when u wanna show off. plus i read that the mamba motors were more efficient than the fiegeo 540 motors.

BP-Revo · 04.22.2007, 01:46 PM

Well, also remember you are comparing a 380 motor vs a 540 motor (though it has a 480 sized rotor). Either way, its still a larger motor. And even if the KV ratings were the same, the Mamba Max Motor would have more torque since its a 540 and could be geared higher because of it.

However, the Mamba Max motor also has more KV as well, so the Mamba Max will definitely be faster than the Feigao motor.

riverat1540 · 04.22.2007, 01:50 PM

i couldnt agree more i feel i made a good decision going with the 5700 for 3s and putting the fiegeo away cause i got the need for speed i did a lot of reasearch before ordering the motor but am sure it will do me better than my fiegeo

skellyo · 04.22.2007, 04:09 PM

Quote:

Originally Posted by BP-Revo

Well, also remember you are comparing a 380 motor vs a 540 motor (though it has a 480 sized rotor). Either way, its still a larger motor. And even if the KV ratings were the same, the Mamba Max Motor would have more torque since its a 540 and could be geared higher because of it.

However, the Mamba Max motor also has more KV as well, so the Mamba Max will definitely be faster than the Feigao motor.

I disagree on the gearing issue. I think you can actually gear a 380C 6L more agressively then the MM 5700 with better results. The longer rotor, albeit maybe a tiny bit smaller diameter more than makes up for the torque...even moreso given the lower kv of the 6L.

However, for just doing speed runs, I don't think I'd buy either. I'd drop the $ for a Lehner.

FWIW, the 6L is no slouch of a motor...I'm running it real close to 50MPH in my T3 (gps verified at 47.7mph) with only using a 2S lipo. The problem I have is keeping the rolling wheelies to a minimum with all that torque.
www.skellyo.com/T3_4.WMV

riverat1540 · 04.22.2007, 06:15 PM

i have the fiegeo now and am happy with the speeds im getting but hear of more speed with the mamba 5700 and i also hear the mamba is more efficient so i bought one and will compare motors and see which one i like more and just keep the one i dont like as much as a spare.

skellyo · 04.22.2007, 07:26 PM

Quote:

Originally Posted by riverat1540

i have the fiegeo now and am happy with the speeds im getting but hear of more speed with the mamba 5700 and i also hear the mamba is more efficient so i bought one and will compare motors and see which one i like more and just keep the one i dont like as much as a spare.

You should easily get more speed out of the MM, just due to being able to go to 3S. The MM are decent motors, but I think too many discount the Feigao as inferior when they do perform extremely well.

riverat1540 · 04.22.2007, 07:37 PM

yea and the torque is amazing even on 6 cells with the fiegeo. did u see my video?

http://www.youtube.com/watch?v=aFM9AnUILI4 the feigeo ripped 3 diff gears apart in this truck before i got the slipper set right