e-maxx brushless recommendations

[jhautz]

Originally Posted by emaxxmafia

So 7xL is faster than 9xL?

When selecting a motor you need to consider more than just the winds. A system like this needs to be panned out before you start buying. (trust me I learned this the hard/expensive way) Plan out what batteries you will be using. Look at the KV rating for the motor. You should shoot for a motor where the rpm on the batteries you are planning to run is round 75% of the max rpm limit of the motor. Much more than this can cause heat issues in the motor, less and you are not getting all of the potential out of the motor. Now you need to decide what is more important to you, Speed or run time. If you want speed you should select a lower wind motor that will rev a little higher. If you want run time, select a motor with a couple more winds resulting in slightly less speed, but more power and run time.

As for the esc... Don't skimp or you will just wind up buying another one later. If the power rating on the esc is close, my recomendation is to go with the next higher power handleing model. In my opinion this is the bigest mistake that most fist time buyer make. (Myself included) Thinking that they can ''get away with it'' and save a few dollars. Lets face it, its a big investment either way. You might as well do it right the first time and in the long run you will save money.

These brushless systems are fantastic if set up well and frustrating if they are not. It is a critiacle balance between, motor kv rating, motor size, esc Amp rating and the voltage you plan on running, and tie all of this together with the budget you have.

Summary / My recomendation. It sounds like you are planning on running 14cell NiMH, so pick a motor that is on the conservative side of 75% the motors max rpm. You can always add an extra cell or 2 to the system later if you want to pop the speed up. Then get the best/highest amp rating esc that you budget can handle.

These are rules of thumb that I have been learing over the last year or two. Nothing written in stone and there are way more experienced peole on this board than me, but this is my $0.02.

If you don't want the fun/challenge of figureing all of this out and understanding it all, then get the HV. All of the thinking is done for you, its a simple out of the box solution that will bump you up from stock. You woun't be slapping the nitros around with the HV, but it will be a ton of fun.

I know, long winded.... I have that habbit. Sorry.

BTW... I agree with everyone else that has answered this. I love the Quark. Gets my recomendation.

Out of all that the thing that stands out the most is "You woun't be slapping the nitros around with the HV" and that means...i dont want it, i want something thats fast enough to beat nitro's, but when i want i can just go run it around bashing ...so my questions is...if i add more batteries,will the runtime increase as well as the speed?...cuz im thinking of getting the Feigao 540c 9XL motor+Warrior 9920 Car Controller (if thats a good setup) cuz itsa about the same price as the HV

[neweuser]

how many cells are you going to run? from what i hear, quark is good, better than 9920 which is what i run. it works great, but the quark would be better. what you pay is what you get...if you have the money, get the stuff! You are right, the HV......you can get a better, faster system, and slap some nitro at the same price. I slap my buddies savage pretty good with my 16 cell, 9920/10xl. he never thought it would, but it does quite well actually!

[jhautz]

I would spend the extra $$ and get the Quark. I have both the 9920 and the Quark . If your spending that much on a system. Do it ight the first time. Quark Is way better, It handles the load of a monster truck much better than the 9920 in my expeiences. I overheated the 9920 much easier than the Quark. I started off w/ a 9920 and a wound up replacing it w/ the Quark. 9920 is the minimum you can get away with on a monster. And BTW. Also get yourself an Ultimate BEC while you are at it. http://www.rc-monster.com/proddetail.php?prod=6vubec Takes a huge load off of the controller. Saves tons of heat. Come to think of it. I dont even think you can use the built in BEC on either of those controllers at 14 cells.

Edit: Besides the load handeling its much smoother on the throtle and brakes than the 9920.

[neweuser]

Yep, he will need the UBEC, or an rx pack, but a ubec is much smoother!

Hello all, nice forum. I hope you don't mind but I would like to kick this horse again, lol. My plans:
Feigao 9l, 9918, 2 2s2p 6000mah lipos, fan, UBEC.

Uses: Bashing around and beating up on neighbors nitro
Wants: Fast!!! runtime better than stock (15+ mins)
Setup: Pretty heavy (lots of shinny stuff), CVD's--stock gears and boxes

Thoughts? Opinions? Recommendations? Greatly appreciated!

[squeeforever]

I would run an XL motor on maybe 5S LiPo.

i have a 9918 and 9l with a gmaxx chassis and i can run with a stock revo on my ok batterys.i would say in the 40 mph area with a 16 tooth pinion and the temps stay down.good luck.

[neweuser]

I'd have to reiterate here. The 9920 is the basic minimum controller (same as the 9918). I would go better, you will in the end anyway. If I had the money now, i would go with...1950/8 with a quark controller (80)? 3s2p...IMO, or something close to this...it's a more efficient set up and probably more dependable. But I'm no expert....i currently run 9920/10xl, like it, but again, would go better now....

[suvowner]

power output from the motor seems a bit confusing, so far i think it is as follows:
hv-maxx - 375 w
castle monster mamba - 2000 w
plattenburg - 1000w
wher would feiago and lehrner fall in this list ???


also it seems running a 12000 miah 2s lipo would give longer run time than a nearly equal weight 8000 miah 3s...........so for absolute max run time it seems hv-maxx would be the best on this list ???? plattenburg and castle would be faster but not actual longer run time for bashing ??? Just checking if my logic is correct ??

[squeeforever]

Actually, a sensorless system such as the Lehner would offer maximum runtime. The HV is less efficient. I'm pretty sure that the XL Feigao motors are around 1800 watts and the Lehner more.

[suvowner]

ok, i understand the better efficiency, i have heard someone say hv around 85% efficient, and the plattenburg and lehrner 93-95%, that is a little better, but with a 5 fold increase in power how could that little bit of efficiency make up the difference in run time ???

[tallyram]

some of the difference is in the build quality and materials .

[suvowner]

ok, between plattenburg and lehrner which do you think is better and why ????


lets say with a quark 125 runnning either lehrner or plattenburg, could you run 2s 12000 miah lipo for decent runs and longer run time, then switch out with a 6s 8000 miah lipo for more speed if needed ??

[squeeforever]

A Lehner is alot better. For one thing, the Plettenburg is a 4 pole motor. And, even being a 2 pole motor, the Lehner is smoother. When you say 2S, you mean 2 2S in series for 4S total right? You can't just jump from 2S to 6S with the same motor. Thats like going from 7 cells to 20 with the same motor. Not to mention, on 2S, a motor wouldn't spin fast enough. Thats if it can run on 6S safely anyhow. Stick with 5S or 6S. That extra 1S will make 5+ mph difference.