chopndroptx

Ok I know this has probably been asked a million and 20 times, and Im sure some are tierd of seeing post about brushless. But I cant find the info im looking for and I want answers from experience.

My roomate just bought the Mamba 5700 while at lunch, and I get to install it. I need to know what gearing is best for this setup, for a happy medium. I have read post that people are running different ratios, but I what to know the best common ratio for bashing.
Right now I have 13t,15t,19t,23t pinions, and 86t,90t spurs. I have seen people running 14/90, 15/86, 15/90, 17/86, 19/86, 12,90.

And what are the limits as far as gearing this setup, highest and lowest with out over heating. I know its best to test and find your own personal setup that makes you happy, but I only have a few ratios to work with and I need to know which is best to start with atleast. I know the higher the pinion the more speed and the lower pinion means more torque, seems to me 15/86 would be the happy medium, but Im not sure.

Also what should I do first when I get this to install this afternoon? I heard alot of people have to upgrade the firmware. And I need to learn how to setup the settings off the computer also. I have no clue and this is the first Mamba I am dealing with. So any suggestions would be great.

Thanks!

guver

My Feedback: (325)

Start out with the lowest (slowest gearing) you have available and go thru the set-ups and soften things up at first. Each set-up has a nice explanation of what it does and what's recommended. The software makes a newbie look like an expert.

jaofos

For general bashing I stay with a 12/90 on a 3s a123 setup (9.9v). If your running 6 or 7 nimh's you can probably get away with 15/90 or 15/86 and when you just wanna go as fast as you can, gear up to 19/86, but don't run more than one pack through it that way and watch your temps carefully.

chopndroptx

I forgot to add he will mainly be running a IB4200 8cell pack.

jaofos

Probably wanna stick with 12/90 or 12/86. You'll go plenty fast geared that way, trust me!

chopndroptx

So lower gearing would be better to start with I have a 13t pinion right now, so I should start out with 13/86 and go from there I take it.

And he has his Pede fully FLM, which I think is a little heavier than stock plastic. If that matters.

notman

oh yeah 12/90

chopndroptx

Ok thanks for your help guys, Im going to have to try 13/90 or 13/86 for now, this is the only gears I have avalible right now. He will be here in a minute, let the fun begin!!!

Maybe Ill see if I can find a 12t tomorrow for him.

TheEmaxxKid

I have run an entire 6000mah 2s lipo in my stampede with a 5700, Masher 2ks, and 23/87 gearing and the motor was only 160 degrees. I could easily gear higher if I wanted to, but it's pretty hard to control at those speeds. The esc hit around 115 or so. I would recommend investing in a temp gun and gearing your Pede for the size of your running area. 13/86 should be a great starting point.

chopndroptx

Right now with a 8 cell IB4200 and 13/90 gearing the motor gets pretty hot to the touch. I dont have a temp gun so I dont know the temp, but its pretty hot. Mesh and drivetrain all roll freely. How do you know when its to hot? I know the general rule is hold your finger on it for 5 seconds, which I can, but it starts to burn after about 3 seconds.

Bombers_410

i run 19/87. Whatever you do just make sure to avoid hitting trees at WOT because you are likely to snap your front bulk head... like me.

chopndroptx

Its a full FLM pede, should be pretty hard to break, but we will see with this kind of power.

chopndroptx

Ok I just ran a Venom 4200 stick pack and the motor barely even got warm. So do you need to gear differently for a higher power battery? Whats the deal?

TheEmaxxKid

The problem with the 5 second rule is that everyone has a different pain tolerance. A temp gun is a very valuable tool.

The stick pack is only six cells, or 7.2v. When running that battery, the motor is only turning 41040 rpm. With the 9.6v pack it's turning 54720 rpm. This translates to a loss in mechanical efficiency and increased strain on the motor which leads to more heat. For the 9.6v pack, you should be geared probably two to three teeth lower on the pinion to compensate.

chopndroptx

What about turning the timing down, the book says it help make the motor run cooler and longer runtimes? I guess Ill try that real quick, but has that helped anyone?

Im already at a 13t pinion, do they make a 10 and 11 tooth pinion in 48 pitch? I need everything from like 9 to 20 i guess, grrrrrrrrrr. Guess I will be making a trip to a LHS tomorrow.

Eman77

^^ Out of the box, the MM default should be set to "no advanced timing", so I wouldn't guess you'd have to adjust that. 13/90 is the lowest you can go with what you have right now...so if you're worried about temps, I'd say get a temp gun. Like this one from Tower doesn't seem too bad (I'm going to get one myself):
http://www2.towerhobbies.com/cgi-bin...6&I=LXEMG5&P=K

At least then you know what your temps are for sure...maybe it's just fine at 13/90 after all!

How does it run at 13/90, by the way?

chopndroptx

It runs pretty good with 13/90, even with the cheap stick pack. But my 13t is kind of toasted, my roomate ran it with the spur stipped and it messed up the teeth on it. Now it strips spur easy.

I ran it with 15/86 with a 6 cell IB4200 and it ran a little longer but not much.

As far as the heat goes, it seems like its getting almost has hot as his brushed motors would get right before he killed those. I talked him into the 5700 thinking gearing wouldnt be such an issue, since I have read people running everything from 12 to 19. But I dont see how anyone is running anything without overheating, expecially 19/86.

I gotta say the thing I hate the most about the Pede is the gearing, and motors. But today is a new day, now I need to see if someone localy has a 12t pinion and some 90t spurs instock. And im going to test everything with my 6 cell packs instead of his 8 cell. Im thinking you cant gear low enough to run 8 cells and make thru a whole pack.

Eman77

Bummer about the bum pinion. You can try 15/90 instead of 15/86. The bigger spur means lower top end, more TQ. (Think: opposite of pinion). That's a general, vague explanation anyway.

I do know that the MM ESC tends to run hot, and that's normal. I think Castle says keep it under 200F, and you're fine. Double-check that, though. So it could be that it will just be hot, period. Not sure on motor temp expectations (I mean to read up on that too).

But with 8 cells, a Pede, and that MM5700...no idea what to expect for temps. I run only 6 cell IB4200 w/the 5700 in my 4WD Bosscat buggy, and that moves pretty darned good. I'd be afraid of flipping my Pede like mad on that, much less adding 2 cells for even more speed!

Anyway, keep us posted. I will go BL with my Pede once my Titan dies, so I'm always keeping an eye open for what folks run, gearing, etc. I will likely go tame on my Pede (5700 or slower, maybe a Novak this time), but it's all still good to know. My Pede has 7 cell IB4200s right now.

But seriously...I'd suggest getting that IR temp gauge so you can be really sure of your temps, and if they are safe. Best to be careful with these BL systems!

chopndroptx

I am heading to the closest LHS in a minute to pick up a 12t pinion, 90 Spur, and a temp gun.

As far as the pede and this 5700, he has the extended/wider FLM chassis and arms, it will hardly flip(unless you do something crazy), and will hardly do wheelies. It will pick up the fronts every once in a while. But it sure balloons those tires running WOT. I ran it on some hard dirt lastnight with 15/86 and I couldnt barely keep it straight, just wanted to spin.
He need to get some better tires than these talons though, they cant grip for anything.

So where can I find the highest recommended temp for the motor? Since Im guessing under 200 is for the ESC.

Eman77

Have you looked on Castle's website for the temp info? I'm about to myself...

Eman77

Looking at the MM manual, it says don't let the motor temp exceed 200 F. (Page 32). No idea about the ESC, though.

Eman77

Can't find an ESC temp guide online at Castle's site. I'm going to send them an email asking...

Scoob

The ESC has thermal protection so it should thermal if it overheats. I have an old Novak SS ESC that has thermalled quite a bit at around 180-190F. I've also temped it at 220F and it didn't thermal! Still runs great though and over 2 years old. The point is I wouldn't totally trust the ESC to thermal but at least it may save you from overgearing.

The motor, being sensorless, has no thermal protection and would run untill it blew . 200F is very hot, it would burn you right away if it were that hot. Castle says it's safe to 200, although I would never run my motors that hot. It can't be good for the rotor magnets. I'm sure they don't use special magnets any better than anyone else.

Honestly though, it doesn't sound like your overheating too bad with 13/90. A temp gun is the only way to be sure.

jaofos

Geared 15/90 with Mashers and 3s A123's my motor hits about 180 according to my Temp Gun.

Geared 17/86 on Anaconda's with 3s A123's its about 190-200 after a full pack and lots of high speed WOT runs.

Josh222

21pinion on stock spur is what a friend of mine runs using a 2S 3P pack 6600mah