What is a good esc for the Lehner XL5000 or 4200?

[Maxx Fast]

What is a good esc for the Lehner XL5000 or 4200? i was gonna use a shulzer but i cant seem to find any cheaper than 250 the can handle 130 amps... heres some specs of the motors i anted to use. Also im running dual DTX 3600 NiMh in an E-Maxx. thank you for any help.

Lehner XL 4200 1300 Watts @ 110 Amps

Lehner XL 5000 1300 Watts @ 125 Amps

[ElectricThunder]

There's a few routes you can go. You can take your chances with a mamba max ESC (and is the cheaper route; it should handle those motors just fine on that voltage- it'd be wise to use a UBEC though since the mamba's BEC gets pretty hot). It'd probably be wise to mount a little fan on the mamba, and that should keep it set.

The other ESC that should work well is the Quark Monster 125 (it's not cheap though). That should handle it no problems. Beware, some Quark ESCs have a problem with the thermal padding coming off of the FETs. The case of these ESCs is the heatsink, and once the thermal padding comes off from those FETs, there's no heatsinking. If you know your way around an ESC, you can always remove the padding in the first place and use some thermal epoxy to prevent this problem from happening.

If you can wait a month or two longer, either the Tekin R1 MT or the Castle Creations Mamba Monster Max should hopefully be out (wishful thinking perhaps.

If you really want a "monster max" type ESC, a member over at RC-monster is doing modifications for the mamba ESCs to basically double current handling ability. GriffinRU is the guy over there. I think he's still testing the mods, but it wouldn't hurt to talk to him.

[SpEEdyBL]

May I ask if you already have the motors? If not, it would be better to consider something else, since those are not the ideal motors for an E-maxx.

[schenck77]

I have to agree with speedybl. I use ran a 4200xl in a maxx before and it ran very hot. as for a esc I would go with something other the schulze. I actually still have a schulze 12.97 sitting around but prefer the mamba for the pc programming. I also run a quark and use that in my 8t with a neu because the mamba's dont really like the neu motors.

I am also hearing good things about the new mgm esc's but haven't tried one yet.

[ElectricThunder]

I have to agree with speedybl. I use ran a 4200xl in a maxx before and it ran very hot. as for a esc I would go with something other the schulze. I actually still have a schulze 12.97 sitting around but prefer the mamba for the pc programming. I also run a quark and use that in my 8t with a neu because the mamba's dont really like the neu motors.

I am also hearing good things about the new mgm esc's but haven't tried one yet.

I forgot about the MGMs. They're supposed to be decent (I wonder if they fixed the brake problem they had though).

I didn't realize this was in an Emaxx....heh. My bad! I agree with speedy and schneck. Those are some awful high Kvs for such a heavy truck on such a voltage. Expect plenty of heat from that setup (if not thermals!).

[schenck77]

from what I have read on rcmonster the reverse problem is much better, but appearently the new esc's still does it if you hit reverse at very low rpm. the new esc's also have a built in switching bec that works up to 6s, so no ubec required. they are also suppose to run very cool.

[Maxx Fast]

if those lehnar xl's are to hot for the e-maxx then wut would be a good motor and esc choice to push it up into the 50's area? also im running dual dtx 3600's and jumbo kong tires. also would the lehners still get hot if i droped my gears to a 15/72 ratio? ty for any help..my e-maxx has just been sitting in my closet til now..(ran it into my friends airplane few months back) just got it working againlast week.

[Maxx Fast]

1 more thing. i was just on ebay looking at those quarks..i like what they can handle but they all say there for airplanes nd helis or those mini-t's.

[ElectricThunder]

1 more thing. i was just on ebay looking at those quarks..i like what they can handle but they all say there for airplanes nd helis or those mini-t's.

You were looking at the wrong ones; Quark has the Air Master series (for planes), and then they have the Roadster (65 amps), Competition (80 amps), and Monster (125 amps) controllers for cars.

Those particlar lehners would get hot because of how high the Kv is. When the Kv is high, the Kt is low. Because the Kt, or torque constant, is lower in the higher Kv motors, they need to pull more current to create the same amount of torque that a lower Kv motor would make (but that lower Kv motor would make it at a lower current and should run somewhat cooler than the higher Kv motor at the same torque output).

Since you only plan on using 12 cells (14.4 volts) and want some nasty speed out of your maxx, maybe you should take a look at the HV4.5 system from Novak. That should be good for about 45mph and should run decently (use the included fan and heatsink). I'm not sure how the 4.5 runs in an Emaxx, but despite it being a higher Kv motor, the Novaks seem to run relatively cool for how fast they spin and seem pretty darn efficient (I've run the 8.5 novak on 12 cells before....:D). My vote is the Novak HV system since you want to keep it at 12 cells though.

There's a few other options, but I'll let others give their opinions.

[Maxx Fast]

oooo...ive never heard about the kv things til about a week ago. nd just now the kt things. kt=torgue kv=voltage? also i think im gonna go with the quark monster 125 and up my batteries to like...17 or 18 volts. do u have any advice on a good motor that has good torgue nd enough speed for likr 45-58 mph area? thanks alot for your help!

[SpEEdyBL]

First, you need lipos for those types of speeds. Run as many cells in series as you can. 6s would be good. Then I would look into a lehner 1950 motor if I were you. An 8 turn will be enough on 6s lipo.

[Maxx Fast]

umm...maybe someone could help me out here.,.,.,.just got a brand new evx esc nd stock receiver just to get it running til i got enough money for the brushless setups...and it broke down again. it will still power up, but will only shift and steer....cant get any power out of the lines from the esc to the motors. (even tested them). power from the batteries and everything..just not to the motors. if anyone could help me figure this out i would really appreciate it. tyvm!