Disappointed with my new mega...should I be?

Originally Posted by speed demon

Artur said I should be ok as long as I try to stay under 50amps constant and so many volts...sorry forgot the number but if I set my charger to 4.1 per cell that should give me enough margin. I doubt i'm the only one trying 6S on an MM but if I see white smoke I'll know why.

with the Medusa 1600 motor I would expect you to exceed 50 amps closer to 70-80 on 6s

[speed demon]

I seen a post were a guy was going over 80mph(in a rustler) and pulling around 1100watts. I figure at 50 with 24 volts that's 1200watts so I might be ok. I'm starting to think that the mega just pulls more amps then the medusa and that's causing the higher temps. If I have time tomorrow I'll just gps both the mega and the medusa with the same gearing and see if there is any speed difference since they both have the same rpm(will really close). Just running both tonight it seemed the mega was abit faster but I'm not good at judging speed.

[lutach]

How is the timing on the MM? A 6 pole motor likes high timing to work efficiently. I had my Mega ACn22/30/2 in my MBX5T and with 14/48 it was running very good. I changed pinion to a 15 to test out a new ESC and the Mega was very hot, but after 7 minutes of hard running. I now have a FUN600-17, with the same 15/48 gearing and it gets very hot in about 2 minutes. The Mega is a power house and in a light vehicle you can get away with higher tooth count on your Rustler. In a heavier vehicle like mine, the proper gearing is recommended. A good tool to get is a data logger from Eagle Tree or BNB Products to see just how many AMPs your set up is giving you. Most of the time is just trial and error.

[speed demon]

Timing is at 10advance. I might try higher. Really wasn't looking for more power just a better setup. With the medusa only on the hottest days did I ever have to worry about temps. I like that and will keep going until I find it. I do love the noise the mega makes as it slows to a stop.

Maybe I should just learn to quit while I'm ahead.

Thanks for the replies guys.

[speed demon]

I took my medusa and ran it at 30/76 with the tall talons and 5S. Did all speed runs one after another only stopping to dig my truck out of the weeds and check speed on my gps. The motor didn't even break 135. So I ordered the 1600 medusa and if anyone wants the mega PM me I'll make them a deal.

[kostaktinos_mt]

what you see is normal imo...
mega motors average efficiency at low and medium portions of the powerband is around 5% lower than the corresponding medusa v2...
peak efficiency is also about 5% lower than medusa v2...

as an example, consider that a 5% efficiency difference means 20watts more heat at 400watts input, whereas a 60mm can is supposed to run 'warm' at 50watts worth of heat dissipation... practically, 5% less efficiency at a similar powerband means 40% more heat...

however, i agree that 15degrees of timing and higher gearing will allow for a better efficiency...


just my 0.02...