Which Brand 7XL motor should I buy? And which ESC?
 

I know I want a 7xl, but which one should I buy? Either have better reliabilty?

Also, which esc would be best for 12-16 cells?

There is no difference, only that BK have better bearings, so get BK. For 12-16 cells a 9920 is perfect. I run mine on 16 cells and its fine.

Thanks. And just make sure before I order, the 7xl on 12 cells will be faster than the Novak Hv-mAxx system on 12 cells right.

Yes, you should smoke a hvmaxx.

Cool. Well let me know if I need anything else. This is whats in my cart.

RC-Monster Brushless Heatsink/clamp XL
BK Electronics Wanderer "XL" Brushless Motor 7XL
External BEC/UBEC 6V
Warrior 9920 Brushless Car Controller

do I need the programmer? anything else?\

So far, my E-maxx just has MIP CVDs all around.

Not to hijack, but can you run 20 cells on the 9920? cuz i just bought some...will it get hot?

running 20 cells on your 9920 is the max # of cells allowed on your controller.....it can be done...but you run the risk of possibly messing up the controller.....besides running (2) 10 cell packs is alot of weight on a emaxx.

Bmr4life, I think you need to order a set of 5.5mm connectors for the controller, too.

20 cells would be 24 volts. I was thinking about running 2 11.1v lipo packs so that would be 22.2v. Would that be running a risk also?

Thanks, I'll add those also.

Is there a certain pinion gear I need to get?

you are really running a chance in frying a controller when you run it on or near it's max cell count or even voltage......example..last spring...I was running a 1895 Micro controller in my emaxx.......I just put in 2 freshly charged 6 cell gp 3300 packs wired in series in my emaxx.....and started to run it...it went 5' then nothing at all.....so I contacted Bk in germany...cause that's who I got it from a few years back...and they said to send it in......after they received it..and tested it..they got back to me and they tested it and said that I some how managed to send 123 amps thru my 95 amp controller....and that was only on 12 cells.....which is 6 cells under the limit of the controller and a total of 7.2 v under the max it could handle....and I fried it......the one thing I just don't understand is why does everybody want to push thier luck and try to run the max # of cells or volts the controller can handle......in my opinion you guys are just asking for trouble or problems or even both......sorry I had to vent......but hey...it's your $......I'm just waiting for some one to come on here and say..OH NO, I FRIED MY CONTOLLLER I THINK...BY RUNNING (X) # OF CELLS....do you guys thinks it's fried.....well DUH....probably is....enough said I think (Neweuser...it's not directed at you)....just tired hearing the same Q's

i understand, but the speed and power is what is wanted i guess in the number of cells. i bought 20, but may just go 16-18

I can understand that speed and power is wanted.....at one time I went upto 16 cells on my 1895..and yes it had insane speed and power...but two much...so I dropped back down to 12 cells...and I actually have just as much fun ....but I also undestand that some of the motors you guys are running don't "wake up" till you up the cell count and the rmp's.....but just be carefull.......my question is simple.....would you rather have a couple of run's at say 18 or 20 cells and a fried controller or continued faithfull use by running a lower cell count.....just don't become to greedy for speed and power and fry the controller....and we all know they are not cheap....just be carefull is all I'm saying...and with speed and power comes risks..

I like the "do u guys think it's fried?" DUH....um, 2+2= JELLO!!!! LOL I'll try 20 and go from there....

just to let you know neweuser....your controller (9920)....the 99 stands for 99 ams and the 20 stands for 20 cells MAX.....in case you didn't know......by the way here are the 9920 specs from the BK site.....

9920 / 3BEC WarriorCar

# 99 Ampere
# 4 to 20 Cells
# 3Amp.BEC on/off Function
# 40 gram (without Part)
# 70x30x12 mm
# Forward-Backward-Brake
# with RC-Car Software, radiatior
# 4 Capacitors

The max. Cells is calculated with 1,2V per Cell.
The Controllers are useable with LiPo Cells.

thanks man. the reason i got it was because it could take 20 cells. i'm runnin ib3800's

also just be carefull....cause it could go "POOF"......drop me a email tonight if you have any Q's.....good luck

the type of cells are fine.....just watch the # of cells.....keep in mind your running 24 Volts thru the controller........also can the motor handle the rpm.......I think the max RPM it can handle is 80,000 rpm....and with a rpm rating of 1502 per volt.....* 24 V you will be running at a rpm of 36,000 give or take a few.....which is fine for the motor.....just sharing some info with you......LMK how it goes....

sure thing. i'm still waiting for that darn ubec...talk about slow. shoulda ordered it from mike...would've already had it! I won't have the cells for awhile unless Mike gets a REALLY good jump on the shipping....

I was running 20 gp2200s on a 9920 for a little while and it didn't get too hot,130F after 10 mins without a fan and no ventilation in the body,but i doubt they hold as much voltage under load as good subCs but they're alot smaller and lighter(4/5th subCs).Also it was a 1300kv motor so little milder on 20 cells.

I wouldn't hesitate to run it on 20 cells personally but put a fan on the controller,that's what i would do with a 10xl,it'll bring that motor to life for sure.

heat isn't really the issue with the controllers.......you can allways keep it cool with a fan and good ventilation.....the issue is the voltage spike and or amps that can suddenly go to the controller from the batts.....and it will fry it......like the post I posted earlier...I fried mine on just 12 cells with a amp spike of 123 amps on a 1895 controller......

Thanks for the input and sorry for the jack!!!

the same here..for hijacking the thread.....but sometimes I think people get absesed with speed and power and forget about all the little things that can affect the controller ect......speed and power is nice but at what price...a fried controller...

I have ran and still run 20 cells on a 9920 with no problems. The esc does not heat up either. I run it on a 1950 hi amp 8t. Dafni has pulled a 130 thru a 9920 as well. I don't think the 20 cells will hurt. The 10xl has a low amp draw to. So that makes it better and easier on the esc as well.

thanks coolhand, sjcrss. when i get them, i think i'll go for it!! If i fry it, well, knock on wood, i'll have my old lady by me one!! TEHE, the least she could do since i'm building her whole truck and paying for it!!! Except the tranny i think she paid for that....

If I thought you would fry it I wouldn't recommend it.
If you run the 20 cells drop back some on the pinion gear. give you longer run time. I think it will be more than you want but that is the fun part. :027:

newe...I'll cross my all my fingers and toes for you......"this comment is to everyone....." I wasn't trying to "P" anyone off....but I was just letting people know what the risks can be.....sometimes your lucky..sometimes your not.......I got into the Bl scene back when "modeltech" did Bl systems which was a re-packeged hacker motor and a schultz controller......so basicly I think around the year 2000......so I do have some expertise......and I do respect everyone else's expertise also....

It is all cool sj. It is hard to say for sure if that 128 amp was the cause or not. It may have been on its last leg when it shot the 128 thru it. I have been running the 9920 on 20cells for a while now. MONTHS Just remember you can use a tv for years and it blow up at any time.

you got a valid point....you just never know with electronics......