7XL or 8L /w MM on an Emaxx? - RC-Monster Forums

sleebus.jones · **7XL or 8L /w MM on an Emaxx? -** 12.20.2006, 02:51 PM

Not sure which way to go here. I'm planning on staying in the 12 - 14 cell range. I'd prefer something that will not blow up the ESC (obviously!) and not run smoking hot.

I see the 7XL draws 95A, right at the limit of the MM, and a bit beyond what cells can supply without too much voltage drop. I looked at the 8L, which only draws 77A, but gives me a more useful Kv rating to work with....but will that overheat?

Any and all opinions appreciated!

Sleebus

GorillaMaxx360 · 12.20.2006, 02:54 PM

i am not exactally sure which is the better choice but i have some people running mm with the 7xl just fine.

crazyjr · 12.20.2006, 02:55 PM

I think the 8XL or 9XL would be better than the 8L and they would be easier than the 7xl on the esc, you may have to gear them up for speed, if thats what you're after though

neweuser · 12.20.2006, 03:51 PM

I personally would not run a MM in an Emaxx...

rotary rocket · 12.20.2006, 04:05 PM

Don't run the 8L. It will get too hot.

I do run an MM with an 8L in my e-maxx. No problems with the MM, but the 8L gets REALLY hot. Next step for me is the 7XL.

phildogg · 12.20.2006, 05:21 PM

I'm running a 7xl and a mm esc on 4s li-po .. no probs here,with a fan on the esc temps are around 98-100 deg. the motor runs around 140's degrees. seems like a good set-up.

phil

Dafni · 12.20.2006, 05:27 PM

crazyjr, in comparison to what phildogg got, what temps do you get on your MM/9XL?? (if you run 4S, that is. Not sure if you still run Ni)

crazyjr · 12.20.2006, 09:34 PM

Quote:

Originally Posted by Dafni

crazyjr, in comparison to what phildogg got, what temps do you get on your MM/9XL?? (if you run 4S, that is. Not sure if you still run Ni)

So far i have been hard on it trying to get it to heat up(stop and go, lots of brakes, running on blacktop to strain it) I haven't got it over 139* the 9xl is running about 120 in the same circumstances. This is with a set of 8000mah maxamps lipo's ( new 20c type) and it rips, literally, I tore up the rear diff trying to make it sweat. So i think it will make a good racing setup for mid to short tracks, going to try taller gearing to get some speed

sleebus.jones · 12.21.2006, 11:35 AM

Quote:

Originally Posted by phildogg

I'm running a 7xl and a mm esc on 4s li-po .. no probs here,with a fan on the esc temps are around 98-100 deg. the motor runs around 140's degrees. seems like a good set-up.

phil

Sounds like exactly what I am after. What gearing/tires are you running?

No worries about jacking the thread folks, all this stuff is good info for da brain box!

Sleebus

phildogg · 12.21.2006, 11:46 AM

I'm geared 18/66 now on stock revo wheels and tires.. with a fan on the esc..
phil

sleebus.jones · 12.21.2006, 12:18 PM

Quote:

Originally Posted by phildogg

I'm geared 18/66

Hmmmmmm. I wonder if it would take 22/66 without overheating? I'm thinking tho if you are running 140 on the motor, maybe not. Looks like your speed is around 30+ mph.

Well now I gotta rethink this. Not sure if I want do drop all that money for slightly better than stock top speed. I was planning on running 22/66 with 14 cells to get into 40 mph territory. The motor seems perfectly comfortable in your setup, but I think what I have in mind may be pushing it too hard.

Pewp.

Sleeb

phildogg · 12.21.2006, 02:35 PM

Quote:

Originally Posted by sleebus.jones

Hmmmmmm. I wonder if it would take 22/66 without overheating? I'm thinking tho if you are running 140 on the motor, maybe not. Looks like your speed is around 30+ mph.

Well now I gotta rethink this. Not sure if I want do drop all that money for slightly better than stock top speed. I was planning on running 22/66 with 14 cells to get into 40 mph territory. The motor seems perfectly comfortable in your setup, but I think what I have in mind may be pushing it too hard.

Pewp.

Sleeb

I wouls say the mm esc and maybe a 8xl with the higher gearing might would be better for you.. as they would be more capable of pulling the higher gear.. I'm going to try a 20/66 before long just to see the temps.might be close to stock speed but it sure is alot more fun.. 20mph rolling wheelie maybe faster.. anyway I could use more speed but its fun like it is a ton of torque.
phil
phil

sleebus.jones · 12.20.2006, 09:02 PM

Cool. Looks like the 7XL it is. I'll prolly end up running it on 14 cells. Maybe that will keep me satisfied until the MMM comes along. :)

Thanks for the input guys,
Sleebus

phildogg · 11:46 AM

hey crazy couple questions, 1. you running a fan on the mm? 2. whats your truck geared now? mines 18/66.
phil

crazyjr · 12.21.2006, 01:29 PM

Quote:

Originally Posted by phildogg

hey crazy couple questions, 1. you running a fan on the mm? 2. whats your truck geared now? mines 18/66.
phil

On one, no i'm not at this time. On two, I had to go with a strobe and 51 tooth mod1 with a 13 tooth pinion, it seems ok on dirt but a little slow on pavement. And for your last question, I'm running default except for a 3v per cell cut-off for the lipo.

Neweuser, If you want ultimate power and run high voltage, the mamba max is not for you, however if you want a reliable, consistent at 4s lipo and easy to use esc for racing, the mamba is probably the ultimate esc for the job.