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Mamba monster truggy elec problem

Old 09-16-2012, 11:18 AM
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pubmaster861
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Default Mamba monster truggy elec problem

I am having a problem with the motor/esc in my truggy(8ight t 2.0 with conversion). I'm running a mamba monster esc with a 1717 castle motor, and as I'm driving it sometimes it will cut off like I'm releasing the throttle but then jolt and continue to excellerate . But it doesn't do this all the time. I don't think it's cogging but it seems there is almost a loss of connection with the throttle. The remote is fine, because I use it in my mini revo as well. Any ideas as to what I should do would be awesome , thanks.
Old 09-16-2012, 11:21 AM
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Default RE: Mamba monster truggy elec problem

Have you calibrated the ESC?
Old 09-16-2012, 11:25 AM
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Default RE: Mamba monster truggy elec problem

Yes when I first got it, I tried it again just to make sure it was done
Old 09-16-2012, 12:19 PM
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wyumez
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Default RE: Mamba monster truggy elec problem

are the a b c connectors soldered correctly? any cross-soldering?

Old 09-16-2012, 12:32 PM
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Default RE: Mamba monster truggy elec problem

Cross soldering? To the motor? It's connected straight from motor to esc bullet into esc I'm pretty sure
Old 09-16-2012, 01:46 PM
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Default RE: Mamba monster truggy elec problem

Are you using an old AM transmitter?  When I got my Castle system (now deceased) it put out so much RF noise, it interfered with the original Tactic AM radio and limited the range to a little over 10ft, at which point it would start to act like you describe, or stop altogether.  Had to upgrade to a 2.4ghz system to solve the problem.  It might also be the BEC in your ESC crapping out, as I've heard the Mambas are wont to do, causing your receiver to "brown out".
Old 09-16-2012, 02:46 PM
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Default RE: Mamba monster truggy elec problem

No I'm running a dx3s that came with the 8ight t, this esc doesn't have much time on it could it really be a bad bec?
Old 09-16-2012, 06:17 PM
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Default RE: Mamba monster truggy elec problem

Thats what they are supposed to do when the battery voltage drop below a certain point. Check you batteries, make sure they are full. Then see what the ESC is programmed at for a cutoff. Sounds like the low voltage cutoff to me.
Old 09-16-2012, 07:30 PM
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Default RE: Mamba monster truggy elec problem

I don't think it's the low voltage cutoff, it does this at full charge. I've read in some posts it's been bad batteries most of the time. I am running a turnigy 4s 5000 mah 40-50c, it just kind of hesitated sometimes it seems like. The low voltage works good cuz it only gives you a burst of speed every time you punch the throttle that part is working fine. It flys when it's accelerating hard, and I don't even have the esc tuned right up, when you do get cogging what is the solution? Is it gear it down or up?
Old 09-16-2012, 07:32 PM
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Default RE: Mamba monster truggy elec problem

And I check my cells with a tester while I'm driving throughout as well
Old 09-16-2012, 09:02 PM
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Default RE: Mamba monster truggy elec problem

It will cog if you are geared too tall. What gearing are you running?
Old 09-17-2012, 09:49 AM
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Default RE: Mamba monster truggy elec problem

I'm running the gearing that comes with the conversion kit, haven't bought anything new. Could be cogging then cuz it's the 1717 motor in it, I believe the biggest can they made besides the 1/5th scale , the pinion is a 15 and the spur is like a 45 or something, tough to tell cuz I destroyed it yesterday and haven't taken it off yet. It was plastic
Old 09-21-2012, 07:00 AM
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Default RE: Mamba monster truggy elec problem

Any luck figuring this out yet?    Can you reproduce the problem on the bench by wiggling wires to see if you have a sketchy connection?  The only other thing I can think of to try is, try powering your receiver with a battery and eliminate the BEC. If that solves it, then it's definately the BEC in the ESC, and you should send it back to Castle. (And good luck with THAT!) 
Old 09-21-2012, 08:31 AM
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Default RE: Mamba monster truggy elec problem

Video would be handy, starting to sound like a shot motor.
Old 09-27-2012, 01:33 PM
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Default RE: Mamba monster truggy elec problem

No haven't got a new gear yet , was gonna try to gear it down and see if that helps, I have noticed some slight twitching before though, is this tied directly to the bec? Sorry for the wait between posts waiting for pay day to get some parts, thanks for posting guys
Old 09-29-2012, 06:53 AM
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Default RE: Mamba monster truggy elec problem

The BEC (battery elimination circuit) is built into the ESC.  The ESC, therefore, powers the receiver.  If the BEC is weak (which I've heard Mambas are) and your steering servo (which gets its power from the receiver) is a power hog like a Savox, it will cause problems. Either the servo will get twitchy, or the receiver "browns out" and can cause twitchy steering or throttle.

If you don't have another servo or receiver to try, it can be tough to find the root cause sometimes.  And of course, since you are electric, you don't have a receiver battery lying around, but that would be a good thing to try if you can get yer hands on one. That would eliminate the BEC. If that solves the problem, then the issue IS the BEC.   Get it?
Old 09-30-2012, 03:21 AM
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Default RE: Mamba monster truggy elec problem

I understand what your saying , my trug is working alot better now I switched receivers and geared it down 3 teeth, I still have an issue where the truggy will start engagin reverse on its own and Rollin backwards slowly but I think this has to do with my dead band on the remote/ the neutral set points, so I'm gonna reset those settings
Old 10-01-2012, 07:54 AM
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Default RE: Mamba monster truggy elec problem

What servo are you using?
Old 10-01-2012, 10:28 AM
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Default RE: Mamba monster truggy elec problem

Jr 9100t
Old 10-06-2012, 08:28 AM
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Default RE: Mamba monster truggy elec problem

How's the electrical issue?  Get'er working right?
Old 10-07-2012, 05:35 AM
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Default RE: Mamba monster truggy elec problem

Ya it's working good just Have to tweak some settings on the es still and test, waiting for snow to melt to test some more
Old 10-14-2012, 06:34 PM
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Default RE: Mamba monster truggy elec problem

Castle bec's aren't the greatest and Spektrum recievers can be sensitive to voltage. Try a glitch buster cap in the spare channel of the Rx. Also make sure you're using the latest NON-Beta version of ESC firmware.

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