Brushless Help
 

hey guys im new to the site and i need some BL help. i have a traxxas e-maxx and i just ordered a MM esc and i was wondering if i use a (external)BEC could i run it on 14 cells?? i am planning on running an 8XL motor with it also. -Wes

yes it can but i recommend lipo batteries. what kv is the motor? the voltage limit on the mm? someone else will chime in

the 8xl is a 2200 isnt it? and yes using an external bec the mm should run on 14cell you might wanna get a big external cap and a novak 25mm fan to help it out, and like mikey said lipos will make a night and day difference over the 14 cells, youll prollly get a good bit of cogging and stutering under acceleration with the nimh and lipo wont do that.

its a night and day difference just running a mm and 5700 combo in a tiny buggy between nimh and lipo, im sure it will be more noticable in an emaxx.

Huge difference from nimh to lipo with the 8xl.
If you would like to run 14 nimh batteries then yes you would need a ubec for it.
Other than that you should be good

You may want to pick up one of mikes motor clamp/heatsink for that motor (it is a nessecity b/c without it the end bells will fall off)

okay so it will work. so i just need to get this- http://www.castlecreations.com/products/cc_bec.html orr is there a different one? i am planning on running a feigao 8xl. and i want to go lipo but my nimh will have to do for now. if theres anything else that i NEEED to run this set up please gimme a link to it. -Wes

That will do. I have the same one and it come set up at 5volts output. I hooked it up to the castlelink and set it at 6.7volts(to get the most from the radio and servos and thats what a 5 cell reciever pack puts out) The castle link would be a good investment too since you could use it on the mm and the ubec


Dont forget the motor clamp/heatsink IT IS A MUST!!!!!!!!!!!!!!!!!!!!!!!

Hey, JDkid - welcome to the forum. Nothing like that JD Green!

You will need a couple 5mm bore 32P (aka .8mod) pinion gears. Mike has them in his store, as do most other major RC retailers.

okay so CC BEC, the CC USB chord, some pinions(how many teeth??), and one of these?- http://www.rc-monster.com/proddetail.php?prod=RCM01 . -Wes

8XL +14 cells on a 3906? = 20/66 = 35mph, best you could hope for really.

A little more info might be handy, such as which emaxx this is, any important changes such as 1/8 scale diffs, or which slipper setup you have (stock, RR etc), and what other upgrades you have. A stock 3906 wont hold upto BL power for very long, but a stock 3905 will be fine...

okay well i might as well post up my maxx

this is the maxx that its going into, the P-Maxx-

http://i162.photobucket.com/albums/t.../Wesley323.jpg

http://i162.photobucket.com/albums/t.../Wesley321.jpg

http://i162.photobucket.com/albums/t.../Wesley322.jpg

http://i162.photobucket.com/albums/t.../Wesley320.jpg

http://i162.photobucket.com/albums/t.../Wesley634.jpg

http://i162.photobucket.com/albums/t.../Wesley635.jpg

http://i162.photobucket.com/albums/t.../Wesley636.jpg

http://i162.photobucket.com/albums/t.../Wesley637.jpg

http://i162.photobucket.com/albums/t.../Wesley633.jpg

its got all purple RPM, skids, shock towers F/R, arms F/R, bulkhead brace, GH racing rear aluminum bulks, custom aluminum skids, RPM F/R bumpers, RPM Knuckles all around, integy piggy back shocks, Trinity XXtra firm springs, OFNA Mutilator tires/wheels, and i got a JR racing servo on the way, and im running 2 7cell maxamps 4700mah battts. thats the maxx thats this BL set up is going into. i have stock slipper set-up. -Wes

If you have the cash, get a medusa 70mm motor instead of the 8xl. Much more efficient and powerful for not much more $.

Purple... **shudders**

In which case use a pinion with 1 more tooth than I suggested since this is a 3905, or a spur with 2-3 fewer teeth. Since the MMM can run upto 18 nimh cells, that may be something to think about....

what medusa motor would work best?(i dont really wanna spend alot thats why i was thinking the feigao). hey whats wrong with purple:D and yeah i was thinking MMM but i already got the MM, so. -Wes

Same rules apply when choosing a suitable medusa- they are just like neus, and same size as the feigaos with regards to L can and XL can sizes etc. I would say a 2000kv 60mm medusa was fine for 14 nimh cells, or 4s lipo if you make the leap one day. A 70mm 2000kv version would be even better, but I dont fancy your chances with nimh cells, they will run very hot with a more powerful motor...

They run hot period.

Not true b/c I had a 9xl in a e-lst2 and it never ran hot. I had 4 sets of batteries for it and could run them back to back. Given that I havent been able to keep a motor cool in my e-revo. I did manage to get a 10L in my e-maxx to stay cool(ran for 45mins and it only got to 175)

I think he ment the nimhs rather than the motors- it is possible to get feigaos running cool, but it takes a lot of careful tuning.

And only 175 after 45 minutes?- thats not exactly cool, but the time frame is quite good in relation.

For a feigao thats great:lol: about the batteries (oops my bad :whistle: ) Thats why I run lipo!

so a medusa 70mm 2000kv would be perfect but it would make my batteries hot? i plan on going to 4s lipo for sure in the future but that might be a little while, so i dont want to kill my batts and have to jump right into lipo bcuz with all my trucks money is kinda tight. -Wes

Yep and yep basically. The motor will be ideal as a reliable and powerful powerplant, but your nimhs will most likely suffer, unless you gear down rather a lot- aim for 35mph gearing at most.

If money is that tight, concider culling some of your fleet so you dont have so many vehicles to maintain and buy parts for- Im sure there are some you could live without (same class of vehicles from different manufacturers for example).

yeah im trying to sell some of my vehicles but no bites:( also i got my MM esc today and i got a question, i had a USB sitting around and since i got my MM esc i decided i wanted to try and program it. so i downloaded the beta verson of the usb program thing from CC, i hooked my esc up to the usb and nothing. the program says theres no MM hooked up. so do i need to plug a batt into it or what? -Wes

Are you using a castle link or plugging the usb cord directly into the esc

usb directly into the esc like it says. -wes

You must have a battery plugged into the controller

The 8XL is 2084kv.

I blew one in my buggy by changing my pinion by a measley one tooth from 15t to 16 & poof it went.

I have ordered a Medusa 2000kv 80mm for my BLST. I'm going to order a 2000kv 70mm for my buggy which has been converted into a CORR truck.

Pity I don't have my 6 MM ESC's back from CC yet. Hopefully next week.

okay well im still having no luck with the esc program stuff so i think im going to be better off buying the whole link kit. also i have another question. whats really the difference between the medusa 70mm 2000kv and the medusa 60mm 2000kv because im looking to buy a used medusa motor and im finding lots of 60mm motors but no 70mm motors. and also the nimh's wont be here long i think im gunna sell some stuff and get 2 of these- https://www.hobbycity.com/hobbycity/...idProduct=6500 and ill be good. that batt will work with the esc and the ubec right?. -Wes

The 70mm will have alot more torque. They are new from medusa. If your truck will be 10pounds or more get the 70mm. it will run cooler and have more gearing options.

That battery will work fine!

yeah i was looking on the medusa site and realized the 70mm just came out. and sweet! -Wes

hey guys i was wondering. could i run 2 2s lipo packs with the MM esc and the CC BEC? also i have a triton 2 charger and i was wondering if i can charge 2 2s lipo's at the same time? and if so what do i need to do so? -Wes

Yes and yes - you need to make a series adapter - not sure if that charge has a built in balancer but you also need a 4s to 2x2s balance adapter.

Briang has the diags for it if you search

okay i found it, thanks!

i have a few questions through.

i want to get 2 of these- http://www.spcracing.com/index.php?productID=59 , are they good bateries?

also i was looking through that how to and it said i nned a LBA10 balancer and i looked at it and the LBA10 has charger leads too, so is it a charger and a balancer? if so does that mean that thats all i need to use or does it plug into my charger? if so cant i just use my charger and a Blinky( http://www3.towerhobbies.com/cgi-bin...&I=LXMRZ9&P=FR ) to balance and charge?

and also when i run the lipo's in my trucks do i need a LVC since the MM dont have one?? and what do i do with the balancing leads from the battery while im running the truck?

sry for so many questions. -Wes

I belive the mm can be set with a castle link to custom voltage cutoff and set for a 4s lipo???

I would look at a battery that will provied a little more in the amp department. They have a 5200 24c that would be great! Or a 8000 12c (both are pretty inexpensive)

i was looking at the 2s 8000mah 12c but isint 12c too small? -Wes

i started with the same setup as yours, but with a 7xl

1) Your Choice of battery PLug
2) Some 4mm or larger bullet connectors
3) RC Monster Motor clamp (XL size)
4) CCBEC
5) CC Castle Link
6) A 25x25 mm fan helps, but select a gear WITHOUT IT!
7) 5mm 32p gear. I would start at 20 and work your way up to about 24 max

Just a heads up, i tried running my NIMH and the batteries fried...had to go lipo...but then again, now im runnig a NEU:lol:...you will soon make the switch:yes:

No(they are rated at 100amps contiues) I am useing true rc 8000mah 10c(80 ams and they run better than the enerland 6000 25c rated at 150amps) for my e-revo with the mmm and castle/neu 2200. There are many here that are useing the spc 8000s. I am going to be orderins some soon

sweet! well im deff going with the 8000's then.

buttt i still need help with the balancer stuff

-Wes

Go with the Hyperion lba10 balancer! It's only a balancer, a charge through balancer, so you hook your charger up to it and then the balancer to the lipo.

fma sells a cellpro 10s charger that can charge 2 of the 8000s at once and balance them(up to 10s at 10 amps ). They also make the multipro4 that will balance charge 4s li based cells and do nicad, and nimh and so on. They are great ballincing chargers.

A balanceing charger does a better job than a stand alone