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vxl motor, mamba esc on 4s?

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Old 09-15-2009, 06:01 PM
  #1
monsterbombs
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Default vxl motor, mamba esc on 4s?

i have ordered a 4s lipo and i am doing this anyway i just
need to know if anyone has done it. yes i searched it, i spent
lastnight researching before i bought the battery's. it will
be going in either a 1/10 stadium truck or buggy. im sure the
battery will have no problem but im thinking the speedy might let go.
if anyone has actually run this i would like to hear what happened.
i was goin to do a 6900 on 3s but a 3500 (vxl) on 4s might not have
the top speed but it should be plenty powerful [>:] and not work
as hard to get the power. i saw some videos of this but they were all
doing speed runs.

yes i have run it on 3s, yes i know how powerful it is. i have a 7700
mamba and i used to like going fast and having a fast truck. now i
want more volts, lower speed and savage-dog like power.

has anyone done this? cheers.
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Old 09-15-2009, 06:53 PM
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Default RE: vxl motor, mamba esc on 4s?

I don't personally understand how you're going to get all that power to the ground. A 2WD stadium truck won't have the traction to actually use all that power, I can barely control the slash w/ vxl on 3S and don't even bother doing it anymore. I just run 2S batteries.

But in reference to your question, I've never done it before and have absolutely no inclination to do so.
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Old 09-15-2009, 07:38 PM
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Default RE: vxl motor, mamba esc on 4s?

you can a 7700 motor on a 1/10 st truck on 3s? ouch what were the temps?

but no i havent done it..

just split the packs and make 2 2s packs
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Old 09-15-2009, 07:38 PM
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Default RE: vxl motor, mamba esc on 4s?


Quote:
ORIGINAL: Druss

I don't personally understand how you're going to get all that power to the ground. A 2WD stadium truck won't have the traction to actually use all that power, I can barely control the slash w/ vxl on 3S and don't even bother doing it anymore. I just run 2S batteries.

But in reference to your question, I've never done it before and have absolutely no inclination to do so.
if youre offroad wight it upfront majoryly like a half a pound or more maybe a good long wheelie bar i'd make it outta metal and for the tires proline badlands they hook up on anything,

the lug
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Old 09-15-2009, 08:28 PM
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Default RE: vxl motor, mamba esc on 4s?

The mamba max will handle up to a 2600 XL motor on 4S with an external BEC. I have a VXL powering my 8B with a 2800KV motor on 3S. I have an external BEC and I will be trying it on 4S with a 2100KV Losi motor to see what happens. I dont think it will blow unless you over draw it with a crazy KV motor. They will both smoke. Its a pretty beefy ESC and its rated for 100amps.....I'll keep my fingers crossed.





Here it is with the 6XL motor but the 2100 on 4S will be happening soon.
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Old 09-15-2009, 08:40 PM
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Default RE: vxl motor, mamba esc on 4s?

im surprised that vx esc hasnt let go yet.
nice buggy? sorry if its not a buggy [:@]

the 7700 and the
6900 dont use on 3s. my lipo caught fire from it.
to much draw. dont do it.

yes getting the power to the ground or not getting to
the ground will be the fun. my 7700 or even the 6900
are for me anyway on 2s are only used in huge areas and they
are a handfull to get them up to speed. getting that power
down is near on imppossible (off road/grass) this will be impossible
if its driven stupid. i just dont want a fire again.
this will purely be for bragging rights and obscene videos.
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Old 09-16-2009, 01:57 PM
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Default RE: vxl motor, mamba esc on 4s?


Quote:
ORIGINAL: monsterbombs

im surprised that vx esc hasnt let go yet.
nice buggy? sorry if its not a buggy [:@]
Yeah, its a buggy. And I doubt it will let go from using it this way. It gets to 120* with the 6XL motor pictured. I dont forsee any problems with this setup. even on 3S it doesn get over 120*.
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Old 09-16-2009, 11:26 PM
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Default RE: vxl motor, mamba esc on 4s?

Hi there,
Glad you're willing to give 4S a try, I'm sure you will find it thrilling.
I've had the chance to run really fast setups on both a 4wg buggy (kyosho lazer) and a stadium truck (losi xxxt) using the mamba max esc. The weather here is quite hot, and definitely affected the motor temps, so not all setups were trouble free.
So far I've tried the following combos:
5700kv on 3s on the buggy - I'd say the fastest, takes off like a rocket due to 4wd.
However, not a fun setup for the long term as it would eat trannys for breakfast, just too much torque for this buggy. Also had to keep an eye on gearing, proper gearing gave acceptable temps.

while the truck has seen:
5700kv on 3s (a beast, but you have to keep an eye on temps) - I killed my motor after a while, can't gear too high)
4600 on 3S, very nice setup, runs quite fast and heat is not a big issue.
4600 on 4S - very close or just as fast as the buggy... the truck was a major beast with phenomenal acceleration. For this setup you should disable de mamba max internal BEC (and use external batteries for the receiver). Otherwise the system will be too hot and bad things will happen. On this setup I used a lower ride height (specially for the front) and mounted the receiver batteries at the front to minimize wheelies. (I used a wheelie bar too). The bad thing is you can´t overgear or risk killing the motor (killed it on the third run: switched gearing, got too excited and forgot to check temps).
VXL on 4S - crazy fast setup, temps are not a problem, However it feels between the 4600/3s and the 5700/3s. I still have to try higher gearings... I'd say it's one of the "safer" setups to try 4S
I do have a feeling that the VXL on 3S and a high gearing could be almost as fast as a VXL on 4S without the need and weight of the external battery pack... that's one setup I'd like to try.

hope it helps

EDIT: the truck with the 4600 on 4S had the fastest top speed, but I'd say the buggy on 5700/3S had the edge in acceleration.
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Old 09-17-2009, 01:05 AM
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Default RE: vxl motor, mamba esc on 4s?


Quote:
ORIGINAL: rufus2000

Hi there,
Glad you're willing to give 4S a try, I'm sure you will find it thrilling.
I've had the chance to run really fast setups on both a 4wg buggy (kyosho lazer) and a stadium truck (losi xxxt) using the mamba max esc. The weather here is quite hot, and definitely affected the motor temps, so not all setups were trouble free.
So far I've tried the following combos:
5700kv on 3s on the buggy - I'd say the fastest, takes off like a rocket due to 4wd.
However, not a fun setup for the long term as it would eat trannys for breakfast, just too much torque for this buggy. Also had to keep an eye on gearing, proper gearing gave acceptable temps.

while the truck has seen:
5700kv on 3s (a beast, but you have to keep an eye on temps) - I killed my motor after a while, can't gear too high)
4600 on 3S, very nice setup, runs quite fast and heat is not a big issue.
4600 on 4S - very close or just as fast as the buggy... the truck was a major beast with phenomenal acceleration. For this setup you should disable de mamba max internal BEC (and use external batteries for the receiver). Otherwise the system will be too hot and bad things will happen. On this setup I used a lower ride height (specially for the front) and mounted the receiver batteries at the front to minimize wheelies. (I used a wheelie bar too). The bad thing is you can´t overgear or risk killing the motor (killed it on the third run: switched gearing, got too excited and forgot to check temps).
VXL on 4S - crazy fast setup, temps are not a problem, However it feels between the 4600/3s and the 5700/3s. I still have to try higher gearings... I'd say it's one of the ''safer'' setups to try 4S
I do have a feeling that the VXL on 3S and a high gearing could be almost as fast as a VXL on 4S without the need and weight of the external battery pack... that's one setup I'd like to try.

hope it helps

EDIT: the truck with the 4600 on 4S had the fastest top speed, but I'd say the buggy on 5700/3S had the edge in acceleration.
hello rufus, first of all let me say thanks for taking the time to share.
alot of that is useful and well explained. i have never run a 4600 or 5700
motor. the 5700 on 3s might actually be what im after by the sound of it.
well the battery is ordered, so i might go to work on the reciever battery.
thanks again for the help mate. hopefully i can get it runnning with desired
results. i will keep everyone posted.

it would be good to hear from more people who have done this.
even if it didnt work.
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Old 09-17-2009, 02:45 AM
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Default RE: vxl motor, mamba esc on 4s?

just bought an BEC $12 shipped. hopefully arrives when the 4s does.
coool.. its a 5a too.

found this heaps of info
http://www.radiocontrolzone.com/show...=223182&page=5
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Old 09-17-2009, 05:31 PM
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Default RE: vxl motor, mamba esc on 4s?

I run an MMM with a 3300kv Medusa on 4s, have for a while now - no problems. Just bashing in short grass, no speed runs. Great power and no heat issues, you'll like the 4s setup lol....
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Old 09-17-2009, 11:51 PM
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Default RE: vxl motor, mamba esc on 4s?

4S is sick!
Forgot to mention most of my runs were on pavement. On 4S and offroad you'll really need great tires and a smooth throttle control, not really good for racing.

Monsterbombs:
What brand is the BEC you're getting? I might get one of those and get rid of the receiver pack.
Also, since you'll use 4S have you decided which motor to get?
If you get a buggy, bear in mind some do not have a lot of space for a 4S pack. On stadium trucks you can just add velcro straps, but on the buggy the chassis may interfere (this was the case with my kyosho lazer, the 3S pack would barely fit).
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Old 09-18-2009, 01:05 AM
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Default RE: vxl motor, mamba esc on 4s?


Quote:
ORIGINAL: rufus2000

4S is sick!
Forgot to mention most of my runs were on pavement. On 4S and offroad you'll really need great tires and a smooth throttle control, not really good for racing.

Monsterbombs:
What brand is the BEC you're getting? I might get one of those and get rid of the receiver pack.
Also, since you'll use 4S have you decided which motor to get?
If you get a buggy, bear in mind some do not have a lot of space for a 4S pack. On stadium trucks you can just add velcro straps, but on the buggy the chassis may interfere (this was the case with my kyosho lazer, the 3S pack would barely fit).
some foreign cheap brand i would imagine, i think its for
planes but meh. i got it on ebay. just type in bec or ubec.
mine i think is 5-30v input 5/6v output. cheaper and easier
than a reciever pack i reckon.

the whole system is going into a 1/10 S/T and i will be using
the velineon motor 3500. should haul.

as for the battery fitting, it will be a bit tall but if i have to
duct tape it in a sock (my personal fav) i will. lol. she'll go.
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Old 09-18-2009, 12:00 PM
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Default RE: vxl motor, mamba esc on 4s?

4S should be just fine with the internal BEC. (Look up the specs on Castle's site if you want good references). The Velineon on 4S will be about the equivalent of a Mamba 5700 on 3S. Your packs shouldn't catch fire if you gear it right and/or you get batteries that are actually up to the job (AKA-25C or higher with relatively high amp-hours). Lipos have their limits, but I don't think most people understand the why's and how's very well. You'll get insane power on anything over 2S anyways, so going 4S would definately be worriesome on a 2WD. Have fun with it!
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Old 09-18-2009, 08:30 PM
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Default RE: vxl motor, mamba esc on 4s?

Actually, disabling the BEC is advisable because on 4S you have 14.8 Volts that the mamba esc needs to lower to 6V in order to feed the receiver and servo, so that's 8.8volts excess that it has to get rid off as heat going to the esc heatsink. On 3S that´s just 5.1volts excess so the ESC will be cooler. All that regardless of which motor you run. Well, that´s at least what should happen in theory, if anyone's tried this correct me if I'm wrong.

cheers.
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Old 09-19-2009, 06:30 AM
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Default RE: vxl motor, mamba esc on 4s?

It all depends on the BEC. The Mamba Max is built to handle 4S, and the heatsink works quite well, so the extra juice lost wouldn't be a big deal if it actually isa linear BEC.
Now If it's a step BEC then you will have zero loss, as it only takes what it needs. I know for a fact that this is what they use in the new Mamba Max Pro because it's the same BEC in the new ICE speedies. As to the older ones, I'm not quite sure. Like I said though, your losses on a 5,000 pack are going to be very small (probablydown around 150mA or less) evenif it were linear. Big whoop-dee-doo. . .

You could realistically run the 4600 Mamba on 4S, so the VXL 3500 should be well within the limits. Heat may play a bigger role, but you can down-gear and still get insane speeds out of it. Just watch your temps and go slow with the gear changes.
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Old 10-30-2009, 10:28 AM
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Default RE: vxl motor, mamba esc on 4s?

My new Mamba Max Pro is made for up to 6S, and does have a switching Bec that allows you to select your Bec Voltage. I bought it to use for Racing in a Mod Slash Class. I will only be running 2S with a Velinion. I bought it because of all the adjustability, and the fact that I can also just drop in a sensored motor if I want too.
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Old 11-01-2009, 03:32 PM
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Default RE: vxl motor, mamba esc on 4s?

I have run a vxl motor on 4s with a Mamba Max esc with a external bec and the vxl died within a day. Cant remember my gearing but the vxl got way too hot and died.
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Old 11-01-2009, 05:23 PM
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Default RE: vxl motor, mamba esc on 4s?

A VXL on 4s will turn 50,000+ rpms unloaded................too much IMO.
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Old 11-01-2009, 05:42 PM
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Default RE: vxl motor, mamba esc on 4s?

but what a blast it is digging double trenches in grass and
getting it up there. i was using a duratrax evader but i
couldnt use the throttle because the ball diff would squele.
now its in a bandit and i broke a hub carrier when testing.
that was weeks ago,i need to get some cash and get it running
again.

soooooooooooo much power its silly. should have it running for the
weekend hopefully.
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Old 11-01-2009, 07:06 PM
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Default RE: vxl motor, mamba esc on 4s?

hey monsterbombs, you mentioned something about making obscene videos with the 4S pack...you got any yet? I would love to see them!
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Old 11-01-2009, 07:28 PM
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Default RE: vxl motor, mamba esc on 4s?

just picked up a 10mp camera so hopefully this weekend i will
have demon-dog like footage in descent quality
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Old 11-01-2009, 07:56 PM
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Default RE: vxl motor, mamba esc on 4s?

That thing has got to be completely insane on 4s[:@], cant wait to see the carnage in the vid!!
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Old 11-01-2009, 09:27 PM
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Default RE: vxl motor, mamba esc on 4s?

I ran my Blitz today on 4s, oh what fun. Handles, it pretty well IMO, just need a little throttle control. Squeeze don't yank lol, the Gladiators shred the grass better than a mower.
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Old 11-02-2009, 07:56 PM
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Default RE: vxl motor, mamba esc on 4s?

http://www.youtube.com/watch?v=phSLp3rFUIw

that took moons to upload. enjoy.

(little yard run no room)
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