Best motor fit for 6s
 

Hi all, I´m going to use 6s on a xray808 with my Mamba Monster, I have already some pinions (14, 16, 17, 18, 19) coming from mike and I want to try a Medusa motor but don´t know which one to choose between 1300 and 1500 rpv.

I guess the 1300 would run more efficiently and will probably fit better the pinion range I have because it will go up to around 29000 rpm while the 1500 will fly up to 33000 so it may need more range in the smaller pinions (stock is 16). I´d better choose the 1300 one, wouldn´t I?

Thanks.

well from what i have heard and read, you want the motor somewhere between 35,000 and 40,00rpm. so i guess a the 1500kv would be your best bet. Dont hold me to it but im pretty sure that the motors are more efficient at this rpm without pushing them too far.

I always thought the lower the rpm the higher the efficiency, that means I´d better choose even the 1600rpv, isn´t it? I was just trying to get the same rpm a nitro motor would pull, if I´m going up to 35000rpm I should buy more smaller pinions...

you might, depends on the track

higher rpm and lower gearign might be the way to go

I'm not familiar with the xray, but the medusa is a multipole motor.

You might be surprised how much you can gear this up. It will have more torque than a 2 pole motor.

I've been looking for a 36-60-2000 for an E Revo, but everyone seems to be out of stock at the moment. This tempts me to go with the 36-60-1600.

Which motor are you looking at?

If I can gear it up so much wouldn´t it be better to stay at 1500 rpv and gear it up to what I need? I think 2000rpv would be too much for 6s, maybe in a revo (dunno) but I was thinking that motors and batteries should point to around 30000, not 40000... so I was thinking... 1500*22,2=33300rpm and 1300*22,2=28860rpm

I thought that the last one would be more conservative (for the lower amp draw) and I would have plenty of torque to gear up to 40-50 for the track, but I´m still not sure, and sincerely I think that I´m getting a bit confused right now...:party:

Also, having a higher rpv motor could be a pain to gear since the smaller the pinion the harder to fit it in the car, isn´t it?

This guy has his E Revo geared 24/54 in an E Revo using a Medusa 36-60-2000 and was hitting 52mph with it.

http://www.rc-monster.com/forum/showthread.php?t=13551

He was doing top speed runs on Asphalt, and did say he would have to gear lower if he were bashing in grass, etc.

Choosing the right gearing can be tricky. Alot of it depends on what you plan on doing with the truck, bashing, racing or whatever.

Brian's top speed estimater is a valuable tool in decision making.

I think any of the motors you are looking at would work with great results, just with each geared a little different.

The lower the kv a motor has, the more torque it makes. However, overall effeciency depends not only on gearing and overall setup, but from motor to motor, differences in engineering design make all the difference.

From what I gather, the Medusa Motors sound very promising. I believe them to be a great performer in a wide variety of applications. :yes:

Where can I get a 36-60-2000? Everyone appears to be out of stock.

are you going to be running your revo on 6s or 4s cause that guy that hit 52 was running it on 4s.

so 6s is going to be amazing haha.

if you do let me know cause i was looking at the same setup but for a nitro revo converted.


oh and so it does not seem like im thread jacking

i would go with the 1500. since unlike the revo you have a center diff and that well giv eyou more power. a revo looses power through its tranny. and since you have so many pinion options i would just go witht he 1500 and gear it for what ever track you drive on.

I have a 2000 I was planning to use in my emaxx, never make it and it´s still in his box waiting for some action... I wouldn´t mind selling it to you but I think that shipping overseas may be too expensive and wouldn´t make a good deal, neither for you or for me.

Back to the topic, I´m sticking to the 1500 now, I think that with the gearing options I have it won´t dissapoint me... I hope.

By the way, today I just received the zippy pack I was waiting and it seems I made a mistake... it´s a zippy-h instead of zippy-r and it won´t even fit in my battery tray... I´ll need to be more cautious next time and don´t order when I´m in a hurry like I did that time... :yes:

those zippy-h packs are good. i have one in my revo. its a 4000mah 6 cell and when i charged it it charged to 4450. i only ran it for about 10mins tell my motor fried. but for those 10min it gave me tons of power.

Yuri

IMO 29,000 is a bit low, I would go with the 1500kv option, and when you gear up the motor will lose effiency since you are increasing the motors work load, and it sounds like you will be in a racing application so you might want a little quickness when you gear up too much you lose that to a certain point, I am a basher so that quickness isnt that important I shoot for the 40,000 rpm range for my Revo. My Neus kv is 1650 on 6s and I like it. Most guys who race buggys run a 2200 kv with 4s and get good results...remember a 5 or 6s battery is pretty heavy and could mess with the balance of the buggy

Yes, I´m sure I´ll be getting the 1500 one, the point is to get faster than nitro, not as fast as them, isn´t it? :wink:

As for balance in the car I knew that 6s is a lot of weight, that´s why I bought the 808, displaced center differential = I can center the batteries a bit more, along with its high steering ability that helps with no-bias braking...

I truly hope I´m not getting any major issues with this car, nobody runs e-buggies around here and I would like people to appreciate all our brushless stuff, I only need to decide what to do with a battery pack that won´t fit in my car :whip: I´ll order the good one next week and think I´ll have another battery tray made at work to fit this only pack... with 5mm body shimming :rofl:

Thank you all guys, your help is very appreciated

I've got a medusa 60mm 2000kv and a mmm that I will be running Zippy 4300 4-6S in an E-revo that has an E-Max tranny in it. I'm not sure what to expect, but as long as the MMM holds up I'll report back my results as soon as I have it togeather.

-Brian

Yuri..
I've got an 808 "E" http://www.rc-monster.com/forum/showthread.php?t=12322

I started it on 1515 1.5 y with 5s. WAY TOO MUCH POWER!, I've steeled down with a 1512 2.d S on 4s and couldn’t be happier and yes I’m whomping the Nitro guys with this setup.. So Best of luck with 6s in the 808..

Best motor on a 6s is the 1515 3ds, it rated for 8s so it will run really cool and provide you with a larger range of gearing options. I use this motor on my GEVO on 6s 52/22 (love it)

Also, you do know that your total height clearance for the 808 is about 43mm from the chassis to the body, just an FYI the largest mAH I was able to fit without shimming the body was 4500..

Best of luck with your build and post some pics when your able..

Well just posting to let you guys know I´ve tested it today in a small circuit and only 12 minutes cos I unplugged one of my bad soldered 6.5 connectors, did solder them yesterday in a hurry (again :whistle:) and with the Zippy-H 4000 6s and the Medusa36-60-2000V2 with EPA to 60% on throttle (just to give it a try).

Running great, plenty of insane power even at 60%, and this is a great handling car in my opinion, only downside is that it seems to be a little nosediving on the air, I was used to my emaxx on 8xl and I guess this motor is much harder to spin freely so I need to give it a little more throttle while getting to the top of the jump, but I think I´ll get used to it :yes:.

Thanks everybody, I hope I can get the 1500 motor soon enough to use it on the race I have in 3 weeks, running against nitro and racing for real (the first time for me) is gonna be fun.... and I´mm sure I will get very nervous too :oh:

I´m not posting pics because my car is right now a bunch of cables with wheels... just keep in mind that the antenna is kept in place with one of the battery straps!!:whip:

Forgot to add temps:

Motor 70ºC
ESC 60ºC
Battery 30ºC
Ambient temp 27ºC

for the 1500kv on 6s you will need a 19 or 20T pinon for track speeds. With the 1500kv motor you will nee a 16 or 17T pinion. I think either motro would probably be fine, but the 1300kv would probably run cooler.

I think the medusa's have different characteristics than the neus and will need higher RPM's to run efficiently. I ran the 1500 in my maxx and couldn't keep the heat down. I had to gear for around 35 to keep temps on the motor under 180. Asheck on the other hand has had great results with the 2000 so who knows. I do think the ambient temps are a major factor as it is always in the high 90's in Houston from April until October.

I run a 1500 medusa 60mm in my hyper8 on 6s. It does get a bit warm. Currently geared 14/46 with the 43/13 diffs and crimefighters. Plenty of power, and very smooth, but the heat does worry me a bit. I may try gearing up a bit, and changing the timing on the quark. I also have a 1600kv 60mm medusa to try. Not sure if the added rpm will help...

New update:

Went this morning through the whole pack in a bigger circuit stopping every 3-4 minutes to check temps, again the 6s pack with the 2000rpv motor, running most of time limited to 75% thought I could hardly get to full throtle...

Ambient temps were around 30ºC (85ºF). Temps used to get at 70-80ºC (160-175ºF) on the motor, 40ºC (100ºF) for the battery and 65ºC (150ºF) for the ESC... even one time the ESC went up to 80ºC (175ºF) ... too hot.

Again... Went thru the pack stopping every 4 minutes cos the esc likes to come up to 75C (167F), don't know if it will be better with the 1500 one when it arrives... Any ideas?

Amb 30C (85F)
Battery 34C (90F)
Motor 80C (175F)

the higher KV motor(2000) will pull more amps (increased heat), so in theory it will run cooler by going to the lower KV motor and should enable you to run more WOT which is better for you ESC. You will pull the most amps punching from a stop

Last update:

Modded the case of the mmm (removed the top) and zip-tied a heavy duty fan... therefore the ESC is now around 120 F, going to keep the fan while I wait for the 1500 medusa, the 2000 is running hot on 14t

Btw the fan is taking around 0.25 amps...

I got the new one peice battery tray for my rc8 from mike and I can now fit a 4s 6000mah poly with a little room to spare about 1/8''.