kd double 820

[ksb51rl]

Just thought I'd post a vid of the throttle of the dual motors. I've never seen brushless before, but how does this compare?

You do that with a MMM/2200 system on 4S with that gearing and the tape is likely to split in one or several places. That's how it compares.

[satyrisci]

It's hard to compare like that. Can't compare tire ballooning to mine because I have a 20T pinion on my brushless ********* motor 2560KV 120A on 4S. I'm geared to go 45 MPH so my Canyons have a lot of ballooning. You can get a BL motor and ESC for about $120. Shipping will be about $15 and take about 2 weeks but you can get 3 day shipping for $15 more. If you get a big pinion, you won't need full throttle to go the speed you want. = My $0.02. This hurts to see someone spend 3.5 to install 2 brushed motors. I have heard the brushes aren't meant to be used for long periods of time. So lose em!

[varunaX]

Yup I know. I've done a lot of brushless reasearch and to each their own.

See I live in montreal where it snows and rains all the time, so the fact that no brushless esc is waterproof is a 100% dealbreaker.

With my brushed motors, my car plows throw snow, slush, goes swimming under ponds and still screams at 40mph, so I figure I have the best of both worlds.

I know ill never beat a mmm car off the line, but I have 300$ more in my pocket than he does

[trax de max]

how does it run on the ground.

[varunaX]

As fast as my merv on 2s, so like 35-40mph

[trax de max]

cool, I like 25mph for off road that's plenty fast for me.

[Mr.ReVoLuTiOnArY]

Hey varuna, Are those the 14.4v or 12v motors? What pinions are you running and on what batteries? How do you like the conversion so far, and does everything seem to run normal? Thanks!

[varunaX]

They are 14v, 31 pinions, 4s lipos

Its really fast and I like it so far. I have not seen an erbe in person so I can't compare it. Like I said, it keeps up with my merv on 2s.

If waterproofness is a dealbreaker then I think this is as close to BL as you can get, which I like. Plus its 200$ cheaper than a mmm.

Wierd thing I'm noticing is that the evx2 is fine when I give it full throttle, but it really heats up when I'm going very slow. Not sure I understand why

[Mr.ReVoLuTiOnArY]

Awesome! Thanks man! and yes that would be $200 in my pocket and waterproof. yeah, way cheaper to keep running as well because you don't have to worry about water, mud and anything that may look damp ruining your esc or motor! Haha! Can anybody say Deal Breaker! I think i know why it runs hot at slow speeds but not at high speeds.

I think its because the continuous current is a little bit too high for the evx2. however peak amps of the evx2 are more than enough for both of them little piggies. and at slow speed you don't have momentum to assist your motors to keep the wheels spinning so it stresses the esc, and that probably why the continuous amps are a little bit too high. but its all good, if you find yourself at slow speeds often then install the 2-speed conversion or an esc fan. Dan at KD has one that runs off receiver power.

Oh and by the way! Your revo looks good!

[chapinb]

The 700's or a single dewalt (or 2 or 8 for that matter) on 4s is roughly equivalent to a brushless on 3s but less efficient.
In your vid i know you have a big ol pinion but it still sounds like its not revving high enough. Almost like its at stock speed or less.

[varunaX]

No way. Your saying a 30$ dewalt motor is the same as 200$ brushless motor!?

Is it something I did to make the revs not as high as they could be?

I can't remeber how fast this thing was stock. I've gone through so many motors, tires, and pinions. It feels powerful though. My tires are taped so they don't baloon fyi

[varunaX]

Oh and by the way! Your revo looks good!

Thanks bro. Wait till you see what I'm doin to it though. Ill take a pic on the weekend

[Mr.ReVoLuTiOnArY]

No way. Your saying a 30$ dewalt motor is the same as 200$ brushless motor!?

Is it something I did to make the revs not as high as they could be?

I can't remeber how fast this thing was stock. I've gone through so many motors, tires, and pinions. It feels powerful though. My tires are taped so they don't baloon fyi

I agree for one, there is no way it is the same as a $200 4s system on 3s or any lipo for that matter. the dewalt motors were designed for torque and not high rpm. so they are two totally different worlds. the dewalt is great because it is super torquey and powerful when overvolted, but you lose a lot of rpm's. that is where the big pinions come in, it will give you your speed back and still have more torque at the wheels than stock. it also has replaceable brushes so your motors will last for frickin ever!

varunaX, No it is not somethin you did. your motors will never rev as high as stock period. its just how drill motors are. but your wheel speed is higher than stock because you are able to harness that huge amount of torque to turn a high gear ratio. but also with high gear ratio's you load the motors more, so it will pull more amps especially at slow speed because you don't have the momentum of fast spinning tires to aid in turning your motors. that is why you esc gets hot at slow speeds.

I just have to say that the stock 550's suck! my single dewalt is way faster then the twin 550's by a long shot. And i have run dual 12v dewalts in my revo before and it was frickin stupid powerful. I hope i answered your questions? and if you have anymore i will be more than happy to help in anyway i can.

I can't wait to see your revo once you mod it some more!

Traxxas has a very strict language policy. A filter operates to convert inappropriate words to *s. When you see these in your post, you MUST edit the inappropriate term.

[Mr.ReVoLuTiOnArY]

The 700's or a single dewalt (or 2 or 8 for that matter) on 4s is roughly equivalent to a brushless on 3s but less efficient.
In your vid i know you have a big ol pinion but it still sounds like its not revving high enough. Almost like its at stock speed or less.

I do want to note, Brushless is stupid powerful! I have driven the ERBE on 6s and its just wild. but the reason some guys like myself go brushed or dual big brushed or whatever is because its cheaper for one, faster than stock, still waterproof and for summit owners better for crawling then a sensorless motor. Though sensored is pretty slick... still very expensive. Especially if you don't own lipo's already. And 700's are no where near as torquey as the dewalt and the dewalt is an 820 so its bigger. and it does add weight, but it can help allot when crawling. plus, it just looks cool man!

[trax de max]

the reason i didn't go brushless was, what's the point in driving a 50mph truck off road. and even in dry spells there's always a puddle/stream/river that needs to be driven through. lol

[varunaX]

yep i agree with you all. driving should be about fun, not being worried about avoiding puddles or wet grass. and honestly, really the only fun i get out of mine is driving it through really deep, muddy, dirty swamps and puddles. same with trying to cross streams with it. with the dual dewalts i can do this and still go about 30-35mph, so im happy. i might have a erevo shell and be missing the 2speed tranny, but everything else on my car is summit: rockers, springs, oil, bumpers, leds etc. its a pretty cool hybrid i think.

check out what i just did! you can see it from the moon

[Mr.ReVoLuTiOnArY]

[QUOTE=varunaX;5098973]yep i agree with you all. driving should be about fun, not being worried about avoiding puddles or wet grass. and honestly, really the only fun i get out of mine is driving it through really deep, muddy, dirty swamps and puddles. same with trying to cross streams with it. with the dual dewalts i can do this and still go about 30-35mph, so im happy. i might have a erevo shell and be missing the 2speed tranny, but everything else on my car is summit: rockers, springs, oil, bumpers, leds etc. its a pretty cool hybrid i think.

check out what i just did! you can see it from the moon

Sweet! looks good dude! I have decided to do something similar to my revo as well. The hybrid idea is great! And i do have to say the dual dewalt is the right setup, because i ran the KD dual 970's for some time and the dewalts are more powerful and more efficient. so they run longer, make more power for longer and cooler temps too.

trax de max, I Agree! That is one reason i stayed brushed as well. also its cheaper. Plus bl cars break parts very frequently on max power or not because they have so much power. Can anybody say "Differential"

[Mr.ReVoLuTiOnArY]

Check this body out... your revo would look sick with this body and some summit fender flares on all 4 corners.
( Its the one posted by Bakushan )

http://traxxas.com/forums/showthread...TOO-MUCH-STUFF!

Fender flares:
http://www3.towerhobbies.com/cgi-bin...?&I=LXWWE2&P=Z

[Mr.ReVoLuTiOnArY]

Just ordered the dual 14.4v dewalt conversion from KD! I will fill you all in on it once i get it running. Also, varunaX, i have an idea to try on the evx-2 to run cooler and have more punch off the bottom that i will test. If it works out then it could really help the esc run those big motors better and more reliably. I am also going to double my run times. Which would be fantastic for summits especially when rock crawling or scale r/c'in!

[varunaX]

Kewll. What's your idea?

[ksb51rl]

Kewll. What's your idea?

Let me guess - a cap pack.

[Mr.ReVoLuTiOnArY]

Your good ksb51rl! that is exactly what i want to run. How did you guess? my caps should be in tommorow and my motors and other parts within a couple of days. I hope this works because if so it will make the evx-2 so much better! And i am going to add two batteries to my revo and run them parrallel to the ones already in it. it will be heavy but, i will get double the runtime and double the amps. plus if your crawling the extra weight will help the suspension move more freely. Check out my other thread to get the full rundown of my cap pack.

Heres the link:
http://traxxas.com/forums/showthread...s-on-Evx-2-esc

[varunaX]

I had some extra screen mesh so look what I made. Its a very ghetto but very functional gear cover that will stop any rocks or gravel from getting into the gear mesh. I use the antenna to keep it down and just fold it back if I need to change pinions

[Mr.ReVoLuTiOnArY]

Rockin dude! looks fine to me, so long as it does its job. I just got done building a couple of brackets for my revo to mount my esc and two more batteries so i am capable of running them for double the runtime, 8400mah to be exact! and i get double the amps so it will sustain more volts under load, which means more power for longer and less battery heat. I can't wait for my motors to show up! i got everything but my stuff from KD, dual dewalts, esc fan, widening kit and some wires and connectors. tho they should be here tomorrow or the day after. Woot! Your truck is looking good varunaX! keep it up!

[varunaX]

Thx bro. Did you get the fans for the motors? You definitly don't need em. They run very cool.

[Mr.ReVoLuTiOnArY]

no i did not. i am sure they do because i was running a 12v single in mine and it ran just as hot as the stock motors with a 21/62 gear ratio, it would run hot on 21/56 tho but it would easily leave a well tuned savage x 4.6 with pipe and 3-speed in the dust with either gear ratio.... and the 14.4v motors would run cooler due to lower kv, im going to run a taller gear ratio tho, 31/62, because i noticed that the smaller spur gear, even tho it is a higher ratio, the 12v motors spool up quicker for some reason... so i hope it will be the same with the 14v'ers. Especially if im running quad batteries!

[varunaX]

31/62 is pretty risky man. That's even higher than most brushless configs

How are you gonna run 4 batts?

[Mr.ReVoLuTiOnArY]

I just ran my revo for the first time.... I am super impressed. my esc was cooler than it used to get with a single 12v'er for some reason and i don't have a cap pack on it. motors, warm. batts, kinda hot but my 4 batt mod will help with that. i also have his widening kit on it and man this thing is awesome! tons of travel with the long travel rockers! very happy!

I made a couple of brackets that go above the front and rear shocks and stay as low as possible. then i built my own battery trays and mounted them to the brackets and made fastening straps to hold the batts in. i also mounted my esc above the rear shocks right behind the motors using double sided tape to hold it to my bracket and it turned out really clean. then i just got some parallel harness adapters to run them for more capacity and double amps. it has some enormous amounts of torque! and it is pretty fast as well. the suspension is super plush with that much weight there so i get maximum articulation when crawling and it soaks up the bumps good too! Just as an example, i was testing in my house and went down the stairs and noticed the chassis stayed level to the angle of the stairs the hole way down, so..... i went back to the top and 100% throttle down the stairs.... the chassis stayed totally level to the angle of the stairs while my suspension worked its magic! it was totally epic. Haha!

[varunaX]

Let's see some pics and vids!

[Mr.ReVoLuTiOnArY]

sure thing man! i will work on getting a camera and get some shots! as soon as i do i will upload them asap! i going out as soon as my batts are charged, to run my revo again just with 4 batts this time and see how she does! Its pretty heavy and sits pretty low with 4 batts but i got a 12.78 min runtime with 4200mah's worth of batteries so i should get atleast double that this time and more power.... Hold on to your underwear!

[Mr.ReVoLuTiOnArY]

[QUOTE=varunaX;5114990]31/62 is pretty risky man. That's even higher than most brushless configs

Well.... i just got done running my revo with the dual 14.4v dewalt motors with my 4 battery mod w/ 31/62 gear ratio and man am i happy! It is heavy, but it is way more powerful than expected. it spins the tires on rough asphalt with no gravel. my slipper clutch is screaming for mercy the whole while until i torque it down 110% tight! haha! Also, the front tires balloon while touching the ground. plus, my run-time. you aren't going to believe me when i say this, but i got approx. a 40 min. run-time on 8400mah worth of nimh. yeah, it's pretty rockin man, and that is a slight under estimation by the way. my temps were completely normal with no fan on esc or motors. i did stop and let it cool at the 20min mark because i had to leave but i just unplugged it and left to go to dinner. came back and drove it for at least another 20min.

[varunaX]

I'm running 31/65 with mine and so far so good. Motors are hotter but I have a feeling the dewalts can take some heat

[Mr.ReVoLuTiOnArY]

awesome. yeah the dewalt motors are extremely tough and reliable. you should not be able to overheat them with that gearing. i also got my esc fan from dan so im good. just have to wait till i go into hobby town to get some parts to fix my revo. i broke it the last time i drove it.

[varunaX]

Yep the faster you go the faster you'll break something. I can only imagine how many parts the brushless guys break

If I had to complain about it, I find that my mount comes loose a lot. I have to always retighten the 3 nuts. I think its casue those spacers are not very strong and can bend under pressure

[Mr.ReVoLuTiOnArY]

yeah kind of how it goes i guess. but when mine broke it broke the rear skid and so my hinge pins fell out... the funny thing was it broke it in a wheely across my street, it was freakin epic tho!