Mamba MAX 7700v PROBLEM!! I Need HELP!!!
 

I just bought a new mamba maxx 7700v brushless systemThe fastest motor on 6 cells for my traxxas rustler.Running the Rustler with the Traxxas Bandit wheels and tires.Gearing it 28 tooth pinion 84 spur.Battery GP3700 matched 6cell racing pack.

I used it a few times and its fast as hell, spins the tires all the way down the block and then hits about 55mph top speed.I bought new rear wheels and tires for it that are made for the Traxxas Stampede looking for more traction.Now it has total traction but the motor hesitates before it takes off from a dead stop and kinda sputters.(now 19 tooth pinion 84 spur)

Is there something wrong with it?
Do I have to send it back to Castle Creations?
Is it because it is drawing too many amps?
Is this normal?
Does it just need to be reprogramed using the the software it came with?

It sounds like it is drawing too much power. The 7700 loves voltage and does give packs a workout. Might be drawing too much power away from the receiver.

You might be right because the way it sputters,it acts like the radio has a glitch.

What if I Run a seperate receiver battery pack like the Nitro powered cars need?

I needed to do that with brushed motors using just a micro switch and have done it also with ESC for brushed motors a long time ago.I think I had to have only the white wire hooked up from the speed control and had the reciver pack hooked into the receiver.

Can you do the same with Brushless?

Yes receiver packs could help. Also a stutter stopper like they make for the Spektrum system.

The 7700 likes power. If you have a buddy that has a lipo you might want to try that just to see how it acts.

I dont have access to a lipo so I think the next thing to try is a receiver pack while looking into seeing if they make some kind of a stutter stopper for the Mamba.

But I run into another question.I think I can hook up a receiver pack correctly with a brushed ESC knowing what wire is what using the colored wire coatings.Black-Red+White receiver.But with this brushless system the wires that go to the receiver are Brown,Yellow and Red. which 2 wires do i disconnect before I can use a receiver pack?

The red wire is just like the others and is still positive. Brown is black and yellow is signal or white as you know it.

Stutter stoppers are generic, plug into the receiver, use the battery slot. Doesn't need to be made for a specific speed control. Just a capacitor that helps hold the voltage temporarily when ya punch it.

Another option to the receiver battery is an outboard BEC, Castle makes what appears to be a nice one. Wouldn't perform as well as a separate battery, which separates radio and drive completely, but might/should inprove things enough. Advantage is no receiver battery maintenance, install and forget essentially.

Oh, and as I understand it you just pull the red/positive wire only from the speedo plug. Being sure to wrap it up safely.

Yea I kinda figured/guessed that.So if the problem is that the motor is drawing all the power and dropping the power delivery to the recevier,a receiver pack would solve my problem.

Though I would be happy to run a receiver pack if it means killer lauches off the line like I use to get with the brushed systems in my cars that got total traction.(I make wheelie bars)It will still be surprising that they can`t or don`t make the system without that flaw.

This Brushless system on 6 cells is definitly a little bit faster top end than brushed 9turns on 6 cells(Its like a good 10turn on 8cells)with out all the maintenance but It is already giving me a head ache.

Hopfully the reciever pack will do the trick.I will let you know what happens.Thanks alot for your help!!

Thanks for your help Dave.

How come they dont have the capacitor intergrated and configured into the ESC?Why is it missing and sold seperatly?

I think I might go with the a battery for the receiver instead depending upon the costs.Aslong as I have some solution.

Thanks again man.

IDK, sounds like simple cogging to me. Have you adjusted anything in the ESC through CastleLink?

No I have not tried that.I just left it the way it was set in the factory.I think every thing is set to 100% but not sure.

Does it have these bullet connectors?....
http://pic20.picturetrail.com/VOL162.../306526456.jpg


Or these?....
http://pic20.picturetrail.com/VOL162.../306526452.jpg

If it has the second ones, call Castle. I'm sure they'll send you some of the updated ones. The ones in the second picture are notorious for causing cogging. Another option (suggested by CC) is to direct solder your motor/esc wires...problem solved.

It's not the setting so much as it is the firmware. Hook your MM up to your computer and upgrade. It should smooth it out quite a bit.

It has the newest connectors that they make and my battery conectors are power Pole.You cant change the connectors or make the wires any shorter or it will void the warranty.forget what CC suggests.they are azz wholez.

I even emailed Castle Creations and they/he told me that with this system,my traxxas rustler should be geared 90/14 to keep the motor from going over 200 degrees faren.as if over heating might be the problem but the crap system does it when its cold when i first put the car down to drive it or warm after i drove it for a while..it never got hot.

even though they say 90 spur for the rustler! the biggest spur gear that they make in that pitch is 87!!!!.or at least thats what i have been told and can not find 90 anywhere i have looked including Traxxas.I can gear it 87/12 but it would go about 10mph! that gearing would be too low.the guy had no clue what he was talking about.

Its pretty fast and everything once it starts going but from a total dead stop total traction total anti wheelie for a killer off the line snap-launch, like i get with brushed motors,the brushless system can`t handle it.It spazes out, all jerky,stuttering glitchy throttle,goging shiit! its just not good performance.Not what i was expecting from something that is supposed to be good.

I took a comparrison look at the pics you posted to the connectors on my system and they look like the ones in the first pic they are wider at the tip and are very nice High current connectors.They have alot of surface connection.

I dout if i cut them off and solder the wires it will change or help the problem.