Mm Vs Mm ?

[Hitman2008]

everyone is talking about there 5700 so I guess its better but from reading reports others would say that the 7700 is better can some on clear this up for me?

http://www2.towerhobbies.com/cgi-bin...&I=LXNKU2&P=ML
Or
http://www2.towerhobbies.com/cgi-bin...&I=LXNKU1&P=ML

5700 = Roughly equivalent in top speed to a very good 9 to 10 turn brushed
motor with a 6-cell battery
7700 = Roughly equivalent in top speed to a very good 5 to 7 turn brushed
motor with a 6-cell battery

[RC Mechanic]

I just got done deciding between the system not to long ago. I chose the 5700 because it is more versatile as far as batterys. THe 5700 can handle up to 12 cells Ni-Mh where as the 7700 can only handle up to 7(might be 8). Also the 5700 can handle up to 3s lipo where as the 7700 can only handle up to 2s. So first off the 5700 system is more versatile. That is thie thing that majorly decided for me.

The 5700 system is supposed to be the fastest in the long run as well, because it can take more cells. I've seen videos on the 5700 on 12 cells and its nearly undrivable. Its CRAZY. I think the overall best sytem is the 5700.

[Hitman2008]

I've heard that the MM ESC can take brushed motor's? can it? its there a turn limit on the motor? and is there any other brushless motor systems that are faster? more versitile?

[RC Mechanic]

Yes the MM ESC can handle brushed 540 sized motors and the best thing is there is no limit. Im not sure about 550 motors though. There is a setting on the MM esc that you have to switch to b4 hooking up a brushed motor but it doesn't take long at all.

[Rustler'06]

The MM ESC can run brushed motors and it has no turn limit.

[rusty nail]

the 7700 is limited to 8 cells.
The best way to decide which motor to get is that if you will be using lipo get the 5700, if you will stick with NiMH, get the 7700. I have the 7700 and can get up to 40+ MPH with a 6 cell, and can wheelie all day. The only issue with the 7700 is the heat, it is not good for heavy off road use. I do a little off-roading every now and then, but if you go Off-road a lot, it might get pretty hot.
If you will eventually use lipo batteries you should probably get the 5700 if you want the best all out speed.

Which ever one you buy, I would get it at B-P-P, for close to $180. Much cheaper than Tower.

[maxspeed2356]

If you call or email Castle Creations and tell them you have a Traxxas Rustler... they will suggest hands down that you should buy a 5700... and not to get a 7700 or a 6900... you should really email them and they will give you all the explainations of why... they would know best.... just a thought


P.S. I changed my mind and bought a VXL combo and new gearing yesterday... can't wait

[maxspeed2356]

Here is the email from Joe Ford at Castle Creations

As for which system to go with...I think anything above the 5700 is a
waste. I don't like not being able to control the vehicle. I'd say 4600
or 5700 max. Even with 6 cells on a 5700 you can easily gear for
40mph...on 7/8 cells or 2s lipo you're looking at 45mph+, with 3s lipo
over 60mph easy. Here's a chart with stock gearing on a B4...we could
easily have gotten 5mph more for each setup.

/We are working on a speed chart, to show actual measured top speeds
with 6 cells, 2s and 3s lipo packs in a variety of vehicles with
“normal” or very conservative gearing. We have a confirmed measured
speed of 62.4mph with a touring car on 3s lipo and the 5700 motor from
one of our beta testers. From our best estimates, very near 60mph should
be easily attainable in touring cars, as well as 2wd buggies and stadium
trucks with the 5700 motor and 3s lipos.
/

/ On 6 cells:
4600 motor ~ 25mph
5700 motor ~ 35mph
7700 motor ~ 45mph
On 2s lipo:
4600 motor ~ 30mph
5700 motor ~ 40mph
7700 motor ~ 50mph
On 3s lipo:
4600 motor ~ 45mph
5700 motor ~ 60mph/

/Look for software updates with more tuning aids to totally dial in your
Mamba Max for any driving situation being constantly added to our
website, as well as additions to this tuning guide as we gather more
user tips and experiences to pass along! /

//Now go pull the trigger and light em up!/
Castle Creations staff/


Joe Ford
Product Specialist
Castle Creations

[mkrusedc]

In summary:

--5700kv on 3s lipo is about 10 mph (60mph vs 50mph) faster than the 7700kv on 2s lipo!

--It can run cooler, possible more gearing options

--It can handle a greater varity of batteries and types.

[eemmaaxxxx]

So basically, out of the three tested or listed, te 5700 is the one to go for. The 4600 is as fast as stock isn't it?

[RC Mechanic]

Not sure about the 4600 but yes the 5700 in the one to get.

[eemmaaxxxx]

Yeh, I was looking at just the 6 cell comparison. The 4600 probably isn't worth it, if you are sticking with 6 cells.

[Joe Ford]

You can go faster with a 4600 than stock on 6 cells...much faster on 3s lipo (and if you don't care about warranty 4s lipo is NUTS), but if you gear for the same speed you get longer runtimes...some people don't need all that speed.

[stumblin]

5700 is the ONLY choice for a rusty IMO, the 6900 and 7700 just don't cut it if you do any offroading and even so with a 6 cell you may get more speed but at the price of your run time. 5700 is the best balance between speed and uptime no matter what battery you use. To be honest the very next battery I would buy if I were you would be the 3cell lipo (maxamps or better? if you can find one better anyway.. Then you will have the best of all worlds, highest top speed available and huge run times. Most 7700's will overheat before you can run through even a 2cell lipo unless you gear them so crazy low that they are just as slow as a 5700 anyway.. SO that means don't bother

[Unsullied_Spy]

5700 is the ONLY choice for a rusty IMO, the 6900 and 7700 just don't cut it if you do any offroading and even so with a 6 cell you may get more speed but at the price of your run time. 5700 is the best balance between speed and uptime no matter what battery you use. To be honest the very next battery I would buy if I were you would be the 3cell lipo (maxamps or better? if you can find one better anyway.. Then you will have the best of all worlds, highest top speed available and huge run times. Most 7700's will overheat before you can run through even a 2cell lipo unless you gear them so crazy low that they are just as slow as a 5700 anyway.. SO that means don't bother

Amen.

I have the 5700 in mine and even 7 months after buying it I still love it. It is pretty modest on 6 cells, but still a ton of torque and the top speed is nice (geared 18/84 or 18/87). I ran 2 of my 6 cell GP3300s together in series, and it is simply crazy, every time I do that I break something (gears, switch, grind down a body post, etc.).

This is a video I did of mine on 12 cells, and it alone has convinced at least half a dozen people to get a 5700

[RC Mechanic]

Haha, thats the video that helped push me over to the 5700 side.

[Olds]

How to you run the 2 in series?

[El Capitan2]

I bought the aluminum idler gear and the guy at my LHS told me to replace the metal top gear with a nylon top gear should I do that? How long will the stock idler gear hold up to a brushless?

[Unsullied_Spy]

Series Connector

The stock plastic Idler gear will strip within the first couple of runs if you don't strip it on the first run. Nylon top gear is a bad idea, get the aluminum one or wait for the steel one to come out and put plenty of lube on it and it'll be fine.

[rusty nail]

the stock top gear is steel. Most people don't change the top gear.

[Olds]

Series Connector

Kool I will have to try that.

[watts300]

I just ordered a 2cell maxamps lipo to use with my 5700. You can be sure I'll post my opinion about it.

[mzs_biteme]

I just ordered a 2cell maxamps lipo to use with my 5700. You can be sure I'll post my opinion about it.

Which one did you get??? I'm planning on building 12cell IB3600 pack soon for extreme pavement action, but been looking at the LiPO's more and more... Let us know...

[brushlessman]

why build a 12 cell pack? build two 6 cell pack and run them in a series!

[spcpicard]

I bought the aluminum idler gear and the guy at my LHS told me to replace the metal top gear with a nylon top gear should I do that? How long will the stock idler gear hold up to a brushless?

He was probably refering to the delrin top gear, I don't think they make one in nylon. BTW derlin is alot stronger than nylon. Probably not as strong as the steel though.

[kulangflow]

The 5700 is definitely a better choice than the 6900 or 7700, but have you considered the 4600?

I went with the 4600 because it's fast, controllable, and versatile like the 5700, but it runs cooler, handles gearing better, and gives slightly longer runtimes. Plus, if you're insane, it's the only motor that can handle 4s lipo.

If you will only run 6 cell packs ever, then the 5700 is a better choice. But if you're going to run higher voltage (lipo or nimh), you should really consider the 4600. It is the choice of many on a different forum that centers around brushless.

Basically, when you have a choice, go with the lower kV motor then volt and gear it to get the speed you want.

IMHO

[mzs_biteme]

why build a 12 cell pack? build two 6 cell pack and run them in a series!

I was thinking just that... I already have 12 cells (9 being used in my 9-cell pack), and will make 2 SxS 6 cell packs and stack them up, and make series and parallel Deans adapters... Series for insane speed runs, and parallel for max bashing time... Should be able to get good 30~40min out of two IB3600 packs in parallel, don't you think?...

[stumblin]

that many cells makes your rusty unusable for anything but a few high speed passes.. just weights too much for bashing. If you want to run that hot get the 3cell lipo, it is the only choice.

[watts300]

Which one did you get??? I'm planning on building 12cell IB3600 pack soon for extreme pavement action, but been looking at the LiPO's more and more... Let us know...

This one.
http://maxamps.com/proddetail.php?pr...o-8000-74-Pack
.. with the 12awg leads.
I just hope it's physically capable of withstanding some bashing in the Pede. (i've read two places that say the contrary.)

[Rusty Boy]

I made the mistake of getting the 7700.
I chose it because of what voltage I was going to run in it. (6.6v able to be boosted to 9.6)
I realize now that I definitely should've gone for the 5700.
The 7700 is complete fire, literally. CONSTANT heat issues.
For kicks and giggles I threw in my first ever brushless motor a 5915kv Feigao 6s and ran it on 13.2 volts. (A123 Racing Li-ion 4 cells in series at 3.3v a cell.)
A solid 5-10 M.P.H. faster than the 7700 at 9.6 volts. Which is 46 M.P.H.(SAD!)
Big surprise is that it ran cool. About 110* on both motor and ESC.
About five minutes less runtime though, BUT the 7700 was paralleled to 4600MaH, the Feigao at only 2300MaH. I get about 10 mins out of the Feigao.
Not bad efficiency If I say so.
Sorry to steal the thread but are the C4 Big stick motor's with the same kv rating as the Mamba motors of the same quality?
If I can save myself a few bucks I will.
Thanks,
Rusty Boy

[watts300]

I made the mistake of getting the 7700.
I chose it because of what voltage I was going to run in it. (6.6v able to be boosted to 9.6)
I realize now that I definitely should've gone for the 5700.
Rusty Boy

You can get a 5700 motor for $65.

[mkrusedc]

I have thermal my 7700kv on 2s LiPos several times. I am trying not to gear down so I have added fans and cut vents in my body. I don't know the results yet because I fried my diff and am doing a rebuild. Yes in retrospect the 5700 would have been better. To bad I did not know about this forum when I bought it. Now before I make a purchase I read a few threads and ask you guys your opinions. Thanks all.

[Rusty Boy]

watts300,
Where can I get the cm36s-5700 for $65 at?
Rusty Boy

[stumblin]

I would imagine anyone who wanted 'should' be able to pick up a Velineon motor and continue to use the max ESC.. both are sensorless.. anyone know for sure though??

[Unsullied_Spy]

I would imagine anyone who wanted 'should' be able to pick up a Velineon motor and continue to use the max ESC.. both are sensorless.. anyone know for sure though??

The Mamba ESC is very versatile, I have no doubt it'll take the Velineon motor. If Traxxas decides to sell the motors separate I think I might pick one up to test out.

[rusty nail]

I have had no problems with my 7700 since I got a new battery. Before, with cheap batts I had very short and very hot runs. Now with an IB 4200 6 cell, geared 16/90 I get a top speed of 45 MPH and 10-15 minutes of runtime. I have geared it 23/90 one time for only 2 passes and got 49 MPH but I didn't want to fry it so I put it back to 16/90. For just normal bashing I use 13/90 and get slightly longer runtimes and around 40 MPH top speed. It does stay quite warm sometimes, but I have never thermalled it, and I don't even own a temp gun.

I am actually very happy with my 7700, although a 5700 would be nice for heavy off-roading every once in a while.

[stumblin]

Velineon 3500 75.00 from towerhobbies

http://www2.towerhobbies.com/cgi-bin...?&I=LXSGV5&P=7

[ksb51rl]

Velineon 3500 75.00 from towerhobbies

http://www2.towerhobbies.com/cgi-bin...?&I=LXSGV5&P=7

I'm guessing Sept. 15.

Oh yeah, 2007. You have to really pin TH down on their dates, or they keep pushing them back.

[watts300]

watts300,
Where can I get the cm36s-5700 for $65 at?
Rusty Boy

Bishop Power Products.
b-p-p.com
Just do a product search for 5700, and you get two results -- the combo and the motor. The motor doesn't have a picture last I saw, but you don't need one. It's green!


*I'll pm you in case you can't find this reply.