motor for emaxx on 3s ??
 

hey ,

i have an emaxx 16.8 with the flm chassis ......, and im looking for a new brushless motor for it , im looking for speeds of 37-40+mph on 3s lipo without overheating , should i get the 9l , 6xl , or 7xl , the gearing i have r 20t , 24t pinion and 62 , 65 , 68 spur ?or suggest any other motors but the max im willing to pay is 60 - 75$ for a motor.

thanks

Just based on your $, a 10L or 9L fiego would be your best bet. I run a 10L in one of my set ups, and it runs just over 40 without heat issues.

What ESC are you running?

im using the mamba max esc

I wish you luck moving a MT @ 40MPH on 3s without overheating! At the very least your putting a huge strain on the batteries, lots of amps at 11.1V. Second all those amps are going to heat up the esc. Lastly the motor is going to have to be a high KV to spin fast enough on 3s to get you to that speed which means more heat, higher kv means more amps! Moster trucks, even a plastic based 3905 Maxx is still a bit heavy to run anything less than 4s.....just my opinion and $0.02

yes , i thought of that , the only reason i want to use 3s is because all i have r 3s lipos and i am buying a new tx/rx so i wont have money to buy a 4s lipo so i thought y not run it on 3s , wats the max speed that i can get it to go with 3s without overheating or by taking breaks each 10 min or so ?

thanks

on 3s I wouldn't expect more than 30 out of it before you have heat issues

I dont believe that to be true. I consistently ran my 10L using six cell nimh's (3300's and 4200's) in 40mph range without overheating. Done the same with the HV-Maxx 4.5's.

10l and 6 cell NiMh can approach 40MPH in a rustler or similar, maybe, but in a 10+lb monster truck? I'm sorry but did you see that he's trying to do this in an E-MAXX? Some people have trouble keeping temps in check on 4s with an xl sized motor in an MT, I really don't see how it's possible with a smaller motor and less voltage, IMHO!

What 3s lipos do you have? You should look at running 2 of the packs in parallel and double the MAH and their output capability. It would certainly make it easier for the batteries to keep up and not get over stressesd/heated.

I did it in my Revo, so I'd think it would work in an Emaxx. I guess I'd better clarify - that was with two six cell packs - standard Emaxx config. When I had mine set up, I heard a lot of people complaining about overheating the L cans all the time also, so I kept an extra close eye on it too. Maybe I didn't supply enough juice to it to get it hot!

I run it right now with two 2S2P A123 packs, and its in the range of 40.

12 cells is abit different to 6 cells, and is a bit different to 3s lipo, is abit different to 4s lipo. I wouldnt run an MT on 3s lipo; the VXL system can manage abot 30mph before heat issues start, so perhaps if you choose a ~3500kv L can motor for your MM to run on with 3s lipo, you;d have similar results.

I have enough experience with Maxx trucks on 3s LiPos that run 40+mph. And I can say that it is very hard to do. You must drop a ton of weight and gear properly. I was able to keep my temps in check but others have had very different results. I run a VXL system on a single 3s LiPo to exceed 40mph. My V-Twin runs in far excess of 50mph on a pair of 3s packs in parallel. Here is a video of my light weight 3906 E-Maxx on a Venom 5400mAh(junk) LiPo. I have hundreds of videos so if you want another, just ask.


http://i252.photobucket.com/albums/h...h_HPIM0125.jpg

Tempted has done it but if you want something reliable and less of a headache I'd go higher. You said Lipos Why don't you use two packs 6s?

6s would be too much power for me , i dont have an esc that handles 6s and i dont want to replace diffs each time or have to buy the hybrid bulks and1/8 diffs , right now im using a 10 l on 3s its goes about 30mph but i need like 5 - 10 mph more , right now im tryn to make the e maxx more raceable and bought alot of parts including a new transmitter heres the link http://www.rcuniverse.com/forum/m_7993686/tm.htm so i dont the the money to buy a new motor so ill be running the 10 l for now , but will a single or twin vxl be better???

The 10l is better than a vxl motor...

Twin VXL is the better choice. I run the V-Twin but it is uncontrollably fast. It would perform better on the track on 2s packs. The 10L isn't a great choice, but neither is the Velineon. The 10L won't get 40mph on 3s. The 10L likely won't get 40mph period in an E-Maxx. I would need video GPS proof to believe it. Here is my V-Twin on 3s LiPos.


http://i252.photobucket.com/albums/h...th_maxx028.jpg

Make the emaxx 2wd and the 10l will do it! I ran a 2wd emaxx with a 380 6l on 3s lipo and it would do 40mph... 4wd may be another story, but a 2wd maxx is fun!

The VXL is made by Feigao so I would imagine effeciency's would be comparible.

It comes down to choices of longer rotor with more torque or two motors - I think you'd both agree they would be better off ($'s and performance) with one good setup.

I'd go for 4s and a Medusa 60mm 2000.

if your truck has quick acceleration 30mph would not be terrible for racing i would not think.

of course 30mph is not an ideal speed... but neither is 3s in a maxx.

shed as much weight as possible, gear it for more torque, and practice your driving.

i think that would be easier then trying to get 5-10 more mph

I ran a single VXL in 2wd when I broke the front diff. It was miserably hard to control. Its fun to power slide but terrible to try and drive.

http://i252.photobucket.com/albums/h...h_HPIM0107.jpg

i just ran my emaxx on 24/66 with a 10l on 3s the speed was increased alot from my old setup 20/68, i only ran it for 12 minutes but i dont have a temp gun , i could put my finger on the motor for about 5 - 6 seconds then it gets too hot, does that mean that the motor is way too hot and i should gear it down or is it good ?

It means get a temp gun. You have to know what your temps are, especially with brushless motors and LiPos.

ok, i decided to move to 4s lipo , my setup will be an 11l motor , with 20,24 pinion , 62,68,65 spur but im not sure wat battery to get , will this battery provide enough amps ??

( R4900-20-4 - Rhino 4900mAh 4S 14.8v 20C Lipoly Pack)

Capacity : 4900mAh
Constant discharge: 20C
Burst rate: 30C (15sec)
Configuration : 4S 14.8v
Pack size: 165x32x42mm
Weight : 498g