Time to pull the trigger on E-Revo Lipos

[DJANG0]

I see TrueRC has stock of 3s 5000's. These will fit the E-Revo according to fellow forum member UE_Test_Pilot's measurements.

Might have to jump on these. Wire them in parallel and get 10000mah run times. But I guess I'll have to decide on that after I make my mind up on whether to run V-Twin or a single BL motor.

Can't wait!

[HoovHartid]

If you are going to wire them like that, I would get the 4s ones.

5000 4s = 27mm x 50mm x 160mm -still within the size limit I think.

5000 3s = 21mm x 50mm x 160mm

both can be wired for 10000mah but your looking at 14.8 vs 11.1

...your also looking at $90 vs $75 tho....

[stumblin]

even stock you need 4s minimum. 3s would be way too slow.

If you can get two 4s packs to fit and wire in parallel, if not get two larger 2s packs and wire them in series (most do the second).

Enjoy

[DJANG0]

Well, I'm not wanting this truck to wheelie while running. Pulling a wheelie from a stand still is fine every now and then, but I like to run the truck all out without fear of it wanting to wheelie/flip over.

I think I need to make a decision on ESC and Motor before I get batteries and I can't decide.

I was thinking V-twin with a 3s on each motor. Some one told me that V-twin setups can fight each other and even cause one of the motors to run backwards and get messed up. The person who told me that is not someone who's RC knowledge I trust, but it's shaken my faith in V-twin, nonetheless.

Feigao motors all seem to run hot and blow their end caps off.

Neu, that's what I see everywhere, but good glory, they are expensive.

V-twin setup is attractive, simply because the parts are plug and play and the price is low as Ebay is flooded with them.

I'm reading lots of Revo conversion threads over on RC-Monster and it seems like most run 2s2p in series. Makes me lean toward 2 4s1p 5000mah wired in parallel, like you're suggesting.

Back and forth I go...

Stumblin', you always seem to have great, informative posts, what are you're thoughts?

[TexasSP]

You can run 6s on a 10XL Feigao without the heat problems. So having 2 3s packs would be perfect. That would put you in the 40-45 MPH range geared properly. You could also check out the Medusa motors.

The other option is to wait for the Castle motors to be released in a month or so.

[jayjay283]

I have a Vtwin maxx. I wouldnt recommend it, its alot less plug and play than people think and not for someone who wants to just run the truck till the batteries run out. If I were you id plan on buying a MMM controller, nothings better for the price. Then decide what brand of motor you want/can afford, then find their available KVs so you can pick the lipos that will fit and give you the best runtime. Im going with the MMM and a Neu 1515/1y to run on 5s and 6s and have a 9xl for 5s and a 10xl for 6s.

Heres a link to lipos, you can find them by size/price mah etc by typing in what you want at the top, after selecting # of cells
http://progressiverc.com/Research.html

[DJANG0]

Was just talking about V-twin in the new eRevo with synapse777 and brought up a point. Running V-twin on the new eRevo will necessitate one of the motors running backwards. This could be hiding a new layer of problems.

I think I'll rule out V-twin and go with a large, single brushless solution.

That's some progress...

Then decide what brand of motor you want/can afford, then find their available KVs so you can pick the lipos that will fit

What do you mean by that? How can I tell what voltage lipo pack a motor will take by it's rated KV?

[jayjay283]

Feigao 40K rated, 9xl= 1853kv X 6s=22.2volts : 1853x22.2= 41,137 rpm too much but on 5s = 18.5 volts x 1853kv = 34280rpm, nice safe #

Neu motor 60k rated 1515/1y: 2200 kv x 6s 22.2 volts = 48840 rpm nice safe #
Neu 1515 1.5d 2700kv x 6s 22.2v = 59940 rpm really pushing it

then you have to figure the amps it needs thats for someone else lol, i figure so long as you have a 5000 mah 25c or higher you should be ok

[TexasSP]

Most guys that have them say that 6s is too much for the 1515/1y and that it's better suited to 4s or 5s setups. My understanding is that the Neu sweet spot is around 40k RPM's.

[jayjay283]

i hear 4s is too slow and you dont feel you get your moneys worth, 5s sounds right but you can adjust the MMM or epa on TX so you dont go too fast on 6s

[BT_EMT]

You can run 6s on a 10XL Feigao without the heat problems. So having 2 3s packs would be perfect. That would put you in the 40-45 MPH range geared properly. You could also check out the Medusa motors.

The other option is to wait for the Castle motors to be released in a month or so.

Actually Joe Ford emailed me 8 weeks minimum. Then I would personally bet they will wait several more weeks to get them packaged up for a good initial release since they know they are going to sell like crazy.

I'll have to say, I really would like to order the whole package at once from RC Monster. Maybe there will be a pre order sale like the MMM had. And by then we should be able to get everything that the Castle website says at once : MMM, motor, pinions, prewired/soldered connectors all in one spot. I hope the package price will be a deal too.

IMHO I expect them in end of June or July.

http://monster.traxxas.com/showpost....9&postcount=36

"Joe Ford
"BT...I'm guessing at least 8 weeks until we get production motors in. Yes, we have prototypes that we're testing with and they're working great. Enlarged bearings (not sure on ABEC rating...haven't gotten all the nitty gritty from the boss man yet). First batch of MMM ESCs will have 10ga wire soldered to the board and 6.5mm connectors attached. Including 10mm connectors (and maybe 10ga wire) for the motor you choose to use in the interim. Motors we're testing are 2200kv. With 24 pinion and stock spur on and Emaxx you'll have a LOT of fun if you run 6s2p A123. 4s A123 gear up considerably on the pinion or drop down on the spur. Make sure your motor stays below 200F though (max temp recommended by most motor manufacturers)."

[TexasSP]

i hear 4s is too slow and you dont feel you get your moneys worth, 5s sounds right but you can adjust the MMM or epa on TX so you dont go too fast on 6s

mkusedc uses 4s and has been quite satisfied. There are several others as well. I would think 40 mph on 4s is pretty nice!

[TexasSP]

Joe says one thing, Patrick says another.

They'll be out sometime I guess.

[jayjay283]

mkus is upgrading to 5s or 6s, he is actually the reason i chose to go 5s or 6s

[nitro28]

I see TrueRC has stock of 3s 5000's. These will fit the E-Revo according to fellow forum member UE_Test_Pilot's measurements.

Might have to jump on these. Wire them in parallel and get 10000mah run times. But I guess I'll have to decide on that after I make my mind up on whether to run V-Twin or a single BL motor.

Can't wait!

Are those only 10c packs? 50 amps continuous seems low to me. I realize he under rates his packs, but that seems pretty far off from 20c.

[stumblin]

Well, I'm not wanting this truck to wheelie while running. Pulling a wheelie from a stand still is fine every now and then, but I like to run the truck all out without fear of it wanting to wheelie/flip over.

I think I need to make a decision on ESC and Motor before I get batteries and I can't decide.

I too would wait till that choice has been made.. you don't want a set battery config making your choices for you. That is how I started way back when.. trying make a system that would work with my 3s2p 8000mah lipo's... just wasn't happening.

Anyway with the MMM and new castle/neu motor only weeks away I highly suggest getting that combo. I think 4s in this setup will be great for racing, 5s for bashing and 6s for speed runs. Very few tracks are big enough to have a 5s config and keep it usable, but I guess you could always use the mamba's software to limit the throttle control if needed and keep the added voltage to keep the system running cooler (really same for 6s config).

• MMM for the ESC hand down no choice
• Castle/Neu motor or just get a Neu 1515
• Batteries: I still favor the maxamps 2s2p 8000mah packs.. done well by me but if you have the funds you can get some 25,30c lipo's or if you can't afford the maxamps try the true-rc packs (15c or better only)

[BT_EMT]

Anyway with the MMM and new castle/neu motor only weeks away

Many weeks away... LOL 8 weeks as per Joe Ford. Then I'd add a few more weeks realistically. July would be my bet to be widely available.

[DJANG0]

Let's not go down the "c" rating path. We all were hovering over kulangflow's thread here and at RCM and elsewhere. All that stuff is as crooked as a politician. I just can't make a decision based on it alone.

The graphs posted on TrueRC tell me the 5000mah will work. I think, anyway.

I'm just a back yard basher.

[nitro28]

Let's not go down the "c" rating path. We all were hovering over kulangflow's thread here and at RCM and elsewhere. All that stuff is as crooked as a politician. I just can't make a decision based on it alone.

The graphs posted on TrueRC tell me the 5000mah will work. I think, anyway.

I'm just a back yard basher.

No, don't get me wrong. I respect True r/c for being upfront about their lipos output. I am sure they will work for many motor combo's. There is a pretty big difference though between the 15c 8000's that kungaflow was reviewing at 120amps constant and 10c 5000's at only 50amps don't you think? Any chance the 8000's fit in the new e-revo? I am just thinking a 2200kv/MMM might be straining those batteries pretty hard. I really like True r/c stuff, I am just making an observation about that particular size and output.

[Bannedito]

What are the odds of using two 3S 2500mah 20c packs that I use for my T-rex 450 in an E-revo? I have a ton of them.

http://www.flightpower.co.uk/index.a...EVOLITE-25003S

[biggregg24]

the 1515 1y will do awesome on 4s, shoot just geared 24/58 you hit 45, and theres still a ton of gearing left in that motor, ive heard 5s is just to get sill once in a while 6s on that motor would just be for speed runs imo

[DJANG0]

No, don't get me wrong. I respect True r/c for being upfront about their lipos output. I am sure they will work for many motor combo's. There is a pretty big difference though between the 15c 8000's that kungaflow was reviewing at 120amps constant and 10c 5000's at only 50amps don't you think? Any chance the 8000's fit in the new e-revo? I am just thinking a 2200kv/MMM might be straining those batteries pretty hard. I really like True r/c stuff, I am just making an observation about that particular size and output.

The 3s 8000's from all the places I've looked won't fit in the battery compartments of the Erevo. Forum member UE_Test_Pilot said the dimensions were 165mm L x 51mm W x 30mm H.

Maybe the 2s2p 15c 6400mah wired as a four cell will turn out to be my best bet. The price sure is nice.

[TwistedWire]

Hey guys, I've been waiting for the release of the E-Revo for a long time now. It'll be my first large scale rc vehicle. (I have lots of 1/10th scale brushless rigs) My plan is to dump the stock motors and go BL right off the start. If things plan out right I will have everything lined up to go with the CC MM system and a set of either 3S 5000's from maxamps or the new 25C 8000's. The 3S 5000's should be good for speed running. But I think two of the 25C 8000 7.4 packs will be best for bashing around the yard. Of courese the first thing that I will see I can change on it the battery trays. A set of 3S2P 8000's would be killer.

TW

[DJANG0]

I'm still thinking about a Vtwin Maxx just because it will be so much cheaper. I have a buddy who has had his Maxx setup as a Vtwin for a couple of weeks now, he loves it. Would you mind going into more detail about what you said the other day?

I have a Vtwin maxx. I wouldnt recommend it, its alot less plug and play than people think and not for someone who wants to just run the truck till the batteries run out.

Other than my buddy saying he's getting some cogging issues and that the RX will lose signal often do to interference from the two motors, I haven't heard of a down side to Vtwin. Not from a reliable source, anyway.


Thanks!

[nitro28]

I'm still thinking about a Vtwin Maxx just because it will be so much cheaper. I have a buddy who has had his Maxx setup as a Vtwin for a couple of weeks now, he loves it. Would you mind going into more detail about what you said the other day?



Other than my buddy saying he's getting some cogging issues and that the RX will lose signal often do to interference from the two motors, I haven't heard of a down side to Vtwin. Not from a reliable source, anyway.


Thanks!

One thing you have to really watch with a vtwin is if one esc goes into low voltage cutoff, before the other one. You can burn up a motor pretty quick that way. If you are going to do a maxx why not a MM or MMM with a single brushless motor?

[DJANG0]

Personally, I just think there's something cool about Vtwin, it's really that simple. Plus, the price of Velineon motor and controllers are dirt cheap on ebay. Dirt cheap and they are great quality. Great combo.

I wonder if the Velineon motors have 0 timing and can therefore be run backwards by switching their polarity. Does anyone know?

That would be a winner in my book. ERevo with Vtwin with a 3s 10c lipo for each controller.

[KEPPY_gotpedes?]

brussless motors done have timing or polarity. the are controled by "software" that send a charge to a phase of the motor therefor pulling the magnet or repelling it.

[TexasSP]

The ESC does indeed set timing of the motor. So if the ESC has timing built in to it, this would cause problem with reverse rotations using a v-twin setup. Now on some controllers like the Mamba, the timing is adjustable, but these settings are not available on the VXL controller.

The motors are also affected by polarity, not just the software. The wires still use a +- setup. In a brushless motor their are two wires to fire off the phases and one wire for return. The software controls which phase it fires on a sensorless motor by reading back EMF from the motor.

Of course it gets more complicated than that but I have outlined the simple version.