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Old 08-30-2007, 06:56 PM   #1
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Default Mamba Max 7700kv VS. 5500kv (questions & suggestions)

Hi,

I'm thinking of ordering a Mamba Max 5500kv or 7700kv. Which one is better for backyard bashing and why would you say so?

There are a few things I would like to find out.
-What battery connector does the ESC come with, or do you have to install them yourself?
-Are all cables included with the set?
-Are all cables soldered on?
-How do you maintain your engine?(any cleaning or spraying...)

I own a TT01 chassis and I want to know if a normal 540 heat sink would fit on the Mambas and does it make sense to get one? And what part on a car is most likely to brake when using the Mamba motors?(spurs, pinions, diffrentials...)


Hope you can help me.
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Old 08-30-2007, 07:25 PM   #2
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Hey Luismx,

I am also looking at a brushless system and have done a bit of research on them. I know they can handle insane amounts of voltage, as people usually pair Lithium batteries with these systems to get insane speeds. However, since I don't own one I can't really answer all your questions.

I do know that you will want to get extra spur AND pinion gears. The Tamiya pinion gears are made of a relatively soft alloy, and even with my Co-27 Pro stock motor, I see a bit of pinion wear even though my spur gear shows no sign of wear.

If I were to get one (if I magically found $200 in my pocket) then I would buy extra spur and pinion gears, and G parts. When I race on gravel/dirt sometimes a small pebble will get into the gear box, and chew up the diff and the intermediate gear. I believe the stock dog bones and cups should hold up fine, but get an aluminum driveshaft. The plastic one warps from the speed and.... I can't imagine a plastic driveshaft paired with a mamba.


Maintenance I hear is very little. You do not need to cut the comm or clean it (I believe) and the motors should have very good bearings. These setups are expensive, but are made to last.

What do you have on your TT-01 now?
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Last edited by Mooshu Beef; 08-30-2007 at 07:26 PM. Reason: typo
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Old 08-30-2007, 07:50 PM   #3
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Between the two, 5700 without a doubt. Actually, I'd even consider a 4600 system for reduced temperatures. The Mamba Max CSM36 motors do get quite hot and you want to get the lowest kv you can to achieve your desired speed. But my suggestion would be to go for either a Novak XBR 8.5 system or a Mamba Max ESC w/ a Peak Vantage/Orion Vortex 6.5 or the like. I don't believe CSM36 motors have sintered rotors which are a must for cooler running IMO.
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Old 08-30-2007, 08:07 PM   #4
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What is a good budget Brushless though?

I was looking to upgrade my ESC and motor, but that together looks like its gonna be over 100$ total. I mean I'd rather pay a bit more and get brushless...
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Old 08-30-2007, 08:25 PM   #5
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Hey,

I've got a TT01 and I'm buying a few hop up parts.

The list is:
-Heat Sink
-Alu Prop Shaft
-Ball Beaing Set
-Adjustable Arm Set
-Turnbuckle Tierod Set
-Alu Damper Set
-Carbon Upper Frame
-Front/Rear Stabilizers
-Alu Racing Steering Set/Steering Link
-New body>WRC 2004 Impreza (messed up my Nissan GTR34 Nismo Skyline)
(Going to order tomorrow!)

Ugh my car has the same engine as yours but not the Pro version.

Good thing is I'm not paying for the system cause my birthday is coming up soon so my parents will buy it.

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Old 08-30-2007, 08:51 PM   #6
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Why not get a 21T Pinion Gear?

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Old 08-30-2007, 08:58 PM   #7
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Actually, I believe you want the 5700 motor. I think 5500 was a typo. The 5700 gives you the greatest range of tunability and battery options. I run one on my XXX-G with 3s 4100mah lipo for bashing and get close to 60mph out of it. It's almost uncontrollable. But when I race I can throw my 6cell ib-4200's in it and gear it up or down for any track. Yes the 7700 will be faster if all you run is 6 cells or 2s lipos, but the 7700 can't be as fast as the 5700 on 3s.

Plus, be prepared to upgrade batteries. If you are not running gp3300's or better high voltage NI-MH cells or 2 to 3 cell lipos with 20c or better rating you won't get the most out of the brushless system.

I've been flying planes and helicopters on brushless for years and glad to see the cars have finally caught up. Hope this helps.....
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Old 08-30-2007, 09:02 PM   #8
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Hey, that's some good info

But I am curious, what are the speeds of brushless systems comparable to a brushed motor? Say, with the normal 6 cells.
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Old 08-30-2007, 09:13 PM   #9
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MM motors do have a sintered rotor.
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Old 08-31-2007, 06:29 AM   #10
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Hi,


I currently have a 3000mah NiMH 6cell battery pack. It runs for about 30+min on my Trinity co27 stock motor which I find is crazy long.
So approximately how long would the 5700 or 7700 last me if I'm zooming up and down a long stretch? I have no problem in waiting to let the engine cool down inbetween and plus I'm buying a heat sink for it. Don't know if that would help.

I watched a video on youtube and saw this TT01 and 7700kv flying up and down, and on he same video there is a Novak 3.5 brushless(I think) not even coming close to the Mamba. http://www.youtube.com/watch?v=RQmj6GVRkxE

Because the video shows the the TT01 is uncontrolable, I have decided to run the gears at 19/61(stock gearing). What I think is it will give me great acceleration and still an amazing top speed.


Hope you can give me a few more tips.
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Old 08-31-2007, 10:54 PM   #11
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First, to answer your question about speed. I think the 5700 is equivalent to a 9t brushed motor. So with that said, if you were already running a 9t brushed setup then the 5700 MM setup with the same gearing and battery would be very similar except for efficency. You would probably get 25% more (plus or minus a little) run time from the brushless.

Looks like you are running a stock 27 turn motor. So the 5700 will be like putting a 9t brushed motor in the car and still using the same battery. It will be faster than what you currently have but you will have reduced run times. Just like what would happen if you put a 9t brushed motor in your car.

Here is the cool thing. You can add 4 more NI-MH cells (10 total) and now your gonna really liven things up. (Imagine a 9t brushed on 12v) I'd say that would easly be twice or nearly three times as fast as your car is now. Problem now is the current you need is gonna go up. You got more voltage but your battery can't make the amps to get the wattage. (volts * amps = watts) You are replacing a 200 watt brushed motor with a brushless motor cabable of 1000+ watts!

Current battery. 7.2v * 100amps = 720watts Do you think that 3000mah battery you have now will make 100 amps? If it did you would probably find the wires in the next town.

Well, what I'm getting at is yes it will be faster, but at the expense of run time with your current battery setup. You are gonna have to go Lipo or 10 cells if you want the most out of the 5700. If you will only run 6 cells or 2s lipo then the 7700 will be faster but NEVER run more than 6cells or 2s lipo or you will fry the motor.

Oh, if you still using tamiya connectors they will melt with the mamba. Time to get some deans......
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Old 09-01-2007, 01:14 AM   #12
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Is BL on a TT-01 overkill? Should get a better chassis first then BL later? I have a tt-01 and never considered bl. I am considering buying a TC5 for BL.
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Old 09-01-2007, 04:07 AM   #13
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Quote:
Originally Posted by luismx123 View Post
Hi,


I currently have a 3000mah NiMH 6cell battery pack. It runs for about 30+min on my Trinity co27 stock motor which I find is crazy long.
So approximately how long would the 5700 or 7700 last me if I'm zooming up and down a long stretch? I have no problem in waiting to let the engine cool down inbetween and plus I'm buying a heat sink for it. Don't know if that would help.

I watched a video on youtube and saw this TT01 and 7700kv flying up and down, and on he same video there is a Novak 3.5 brushless(I think) not even coming close to the Mamba. http://www.youtube.com/watch?v=RQmj6GVRkxE

Because the video shows the the TT01 is uncontrolable, I have decided to run the gears at 19/61(stock gearing). What I think is it will give me great acceleration and still an amazing top speed.


Hope you can give me a few more tips.
luismx123
MM 7700 can't be faster than a Novak 3.5 or any other 3.5 motor.Unless there was a problem on the other car (esc,or motor or batteries).The fact that the TT01 was uncontrolable on the video doesn't mean that the MM is faster, at least to me.
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Last edited by Born2Run; 09-15-2007 at 02:04 PM.
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Old 09-01-2007, 05:14 AM   #14
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The 3.5 in the video looked like there was something wrong, I have borrowed a MM 7700 and you could be heaps more harsh on the throttle and not lose too much traction but with my novak 3.5 you couldn't get away with it.
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