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70 mph??? is it possible

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Old 02-16-2009, 03:49 PM
  #1
asimons07
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Default 70 mph??? is it possible

i have a mamba sidewinder with their 5700 kv motor. i know the sidewinder is an entry level brushless esc but it really seems to be lacking torque and top speed, even on a 7 cell battery. could this be a set up problem??? i was wondering what are some other good choices as far as brushless if i wanna go really fast. i just picked up a traxxas slash and have seen vids of them with brushless systems. they seems to be crazy fast. thanks, Adam
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Old 02-16-2009, 03:57 PM
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Default RE: 70 mph??? is it possible

I have the same system on my Evader ST and it screams. I'd say easily 35-40mph on a Trinity 5000mah 6 cell stick pack. My first question is what kind of batteries are you using? My second question is anything binding?

EDIT: To achieve 70mph +/- I would try the Velineon 3500kv motor and a 3S Maxamps 8000mah lipo. You should be able to run the Sidewinder speed control with that combo from what I hear. You're not gonna hit anywhere near 70mph on 6 or 7 cell nimh...
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Old 02-16-2009, 04:01 PM
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Default RE: 70 mph??? is it possible

70MPH is not as easy to hit as people make it out to seem, even with the likes of a Mamba max and a VXl on 3S. Your going to be running a very low gear ratio to get going that fast and its not even practical for driving. That would be onroad only and running for a little bit at a time because that motor and esc is going to get very hot. Now when I had a Sidewinder 5700KV in my E-Firestorm running a 2S pack I had no problems flipping the truck over and doing wheelies, temps were nice and safe after a whole 5500mah pack and I clocked it at about 45mph with my radar gun. Your problem sounds like low quality batteries, what kind of batteries are you using?
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Old 02-16-2009, 04:05 PM
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Default RE: 70 mph??? is it possible

My sidewinder 4600 is insane on 3s. 50+ easy depending on the car and gearing. It's alot more powerful than a vxl. Only problem is it runs hot even with the timing on low.
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Old 02-16-2009, 04:16 PM
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Default RE: 70 mph??? is it possible

The mamba max esc with the vxl motor is the best combo to hit those speeds. Unless you are talking a MMM and other motors. If you gear it right you can hit 70 no problem. There are people on youtube hitting over 90 with the MMM and only 4s.

Also I hate it when people call the sidewinder a mamba sidewinder. It is not a mamba, it is a CASTLE sidewinder. Mamba is not the brand. The mamba max is an esc that is made by castle creations.
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Old 02-16-2009, 04:22 PM
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Default RE: 70 mph??? is it possible

Yeah, the best you'll get out of that setup in particular is probably mid 50s geared high with a 2s lipo under ideal on road conditions. Your all around torque and speed would benefit greatly with a 2s lipo over a 7 cell nimh. Also make sure you aren't geared too high. Once you start gearing it too high, it wont gain you any speed.
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Old 02-16-2009, 04:28 PM
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Default RE: 70 mph??? is it possible

im not really sure what brand the battery is... i have an orion 2s 5000 lipo im going to try next. id like to get my slash to run around 50ish. i just couldnt believe how little torque and speed the sidewinder w the 5700 had. i had a vxl and was not impressed. traxxas rates it to handle a 10 cell nimh but it would go out on voltage overload protection even when i tried to run an 8 cell so i sold it. if i was to get a mamba max, what motor do you guys recommend? the 5700, 6900 the 7700. i dont plan on running a 3s lipo any time just my 2s. thanks, Adam
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Old 02-16-2009, 04:54 PM
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Default RE: 70 mph??? is it possible

the 5700 for 2s, but it might still get hot in the slash.
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Old 02-16-2009, 04:56 PM
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Default RE: 70 mph??? is it possible


Quote:
ORIGINAL: asimons07

im not really sure what brand the battery is... i have an orion 2s 5000 lipo im going to try next. id like to get my slash to run around 50ish. i just couldnt believe how little torque and speed the sidewinder w the 5700 had. i had a vxl and was not impressed. traxxas rates it to handle a 10 cell nimh but it would go out on voltage overload protection even when i tried to run an 8 cell so i sold it. if i was to get a mamba max, what motor do you guys recommend? the 5700, 6900 the 7700. i dont plan on running a 3s lipo any time just my 2s. thanks, Adam

A Mamba Max won't get you anything over the Sidewinder running 2s and 5700kv. I would try the lipo with the Sidewinder before spending anymore cash, also like I said check for binding, like pinion to spur gear...
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Old 02-16-2009, 05:06 PM
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Default RE: 70 mph??? is it possible

there is no binding. this was actually the first run on the truck. i just bought it a few days ago. the wheels spin freely, the pinion and spur mesh is correct. im not new to rc's. i currently own 31 others believe it or not. this is pretty much my first experience with owning a brushless system. im almost wondering if it is the battery. i will try the lipo and let you all no. i might buy the mamba max anyways. i want to put the sidewinder with an integy 55t motor in my axial ax10 scorpion crawler and get a mamba max esc and use my 5700 in the slash. i also need to get a castle link and i believe if i get the mamba max they come with one so that works out. the 5700 should be able to push the slash right along right?
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Old 02-16-2009, 05:10 PM
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Default RE: 70 mph??? is it possible


Quote:
ORIGINAL: asimons07

there is no binding. this was actually the first run on the truck. i just bought it a few days ago. the wheels spin freely, the pinion and spur mesh is correct. im not new to rc's. i currently own 31 others believe it or not. this is pretty much my first experience with owning a brushless system. im almost wondering if it is the battery. i will try the lipo and let you all no. i might buy the mamba max anyways. i want to put the sidewinder with an integy 55t motor in my axial ax10 scorpion crawler and get a mamba max esc and use my 5700 in the slash. i also need to get a castle link and i believe if i get the mamba max they come with one so that works out. the 5700 should be able to push the slash right along right?

Yes, please try the lipo, I think you're gonna be pleasantly surprised.
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Old 02-16-2009, 05:11 PM
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Default RE: 70 mph??? is it possible

The 5700 is NOT considered a suitable motor for the Slash. The 4600 is pushing it and the 3500 Traxxas motor is just about perfect.
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Old 02-16-2009, 05:15 PM
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Default RE: 70 mph??? is it possible

well like i said i was not impressed with the velineon system... im not going to be doing any off road with the slash. just playing around on a huge parking lot. the 5700 should be ok for that right???
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Old 02-16-2009, 05:38 PM
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Default RE: 70 mph??? is it possible

Lots of things are possible. Where there's a will there's a way:

http://www.youtube.com/watch?v=GKctWzmIgVc
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Old 02-16-2009, 05:59 PM
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Default RE: 70 mph??? is it possible

A 2s pack is not going to be faster than a 7 cell nimh. A nimh pack has more voltage at the start than a 2s. Although the 2s will last longer on the same performance.
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Old 02-16-2009, 06:02 PM
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Default RE: 70 mph??? is it possible

i can only hope that maybe there is something wrong with the 7 cell battery. if not then i have issues with the sidewinder... is it possible it could be a set up issue. i just did the initial set up bc i used a new transmitter. are there different profiles? ive never used a castle link on it...
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Old 02-16-2009, 06:03 PM
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Default RE: 70 mph??? is it possible


Quote:
ORIGINAL: fusebmx13

A 2s pack is not going to be faster than a 7 cell nimh. A nimh pack has more voltage at the start than a 2s. Although the 2s will last longer on the same performance.

It will be faster than a "subpar" 7 cell nimh for sure. There's more to it than volts, is about the amperage the pack can put out. I'd just like to hear the results from using the 2s lipo...
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Old 02-16-2009, 06:09 PM
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Default RE: 70 mph??? is it possible

i do no that my lipo is a 5000 2s 30c... im actually at work so i cant test the lipo now. ill be sure to let you all know what happens when i try the lipo... im hoping thats the problem. whats a good price to pay for a mamba max? used or new...
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Old 02-16-2009, 06:10 PM
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Default RE: 70 mph??? is it possible

There are a couple of things working againist you here. First is the truck itself. The body of the Slash is large and creates a ton of drag. Somewhere around 50mph the body begin to make lift and will actually flip the truck over backward. I've had this happen a couple of times running a 3S Lipo on a VXL system. I believe your best bet at going 70mph is the mamba ESC and a VXL motor (unless you want to get into big motors) and a 3S 8000 Lipo. You'll also have to figure out something with the body to reduce the lift and drag. I don't think a MM4600 or 5700 will get you even close.
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Old 02-16-2009, 06:14 PM
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Default RE: 70 mph??? is it possible

I know. But since he does not spcify what type of 7 cell I can only say from experience. Here are my results.
Sidewinder 5700 with 7 cell ener-g SXS pack pushed my stampede to 52mph (this is geared way to high for anything more than a few passes)

and with a 2s 4000 25C pack it went 47mph. However the 2s lasts longer and has the same amount of power throughout the run. The 7 cell just has more initial power and acceleration. If you put a bone stock slash against another bone stock slash with one running a 2s and the other a 7 cell i can guarantee that the one with the 7 cell will beat it.

Who even cares, everything is slow anyway unless you have 3s+, everything else is just boring now.
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Old 02-16-2009, 06:14 PM
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Default RE: 70 mph??? is it possible

Quote:
ORIGINAL: asimons07

i do no that my lipo is a 5000 2s 30c... im actually at work so i cant test the lipo now. ill be sure to let you all know what happens when i try the lipo... im hoping thats the problem. whats a good price to pay for a mamba max? used or new...
30c is good, the pack will have a lot of punch (amperage).
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Old 02-16-2009, 06:14 PM
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Default RE: 70 mph??? is it possible

I would like to see what a Mamba Max and the new 9000KV motor will do on a 7.2 NIMH...
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Old 02-16-2009, 06:15 PM
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Default RE: 70 mph??? is it possible


Quote:
ORIGINAL: john01374

There are a couple of things working againist you here. First is the truck itself. The body of the Slash is large and creates a ton of drag. Somewhere around 50mph the body begin to make lift and will actually flip the truck over backward. I've had this happen a couple of times running a 3S Lipo on a VXL system. I believe your best bet at going 70mph is the mamba ESC and a VXL motor (unless you want to get into big motors) and a 3S 8000 Lipo. You'll also have to figure out something with the body to reduce the lift and drag. I don't think a MM4600 or 5700 will get you even close.
I agree, but gearing is everything . You can gear the vxl way higher and not have bad heat issues. But if you geared one of the CC motors that high it would toast in minutes.
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Old 02-16-2009, 06:19 PM
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Default RE: 70 mph??? is it possible

i actually think the battery i was using was just a 3600 7 cell nimh. if i remeber right i took two 6 packs apart and made a nine cell at first. the vxl wouldnt handle it so i then made it an 8 cell but with the same results. i then sold the vxl and made the 7 cell. im def going to try the lipo. i dont really care about 70 mph but i would like some speed and torque out of it though. id say i was lucky if it was going 25-30 with the 7 cell, sidewinder and 5700. it was slow as hell trying to get there too.
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Old 02-16-2009, 07:01 PM
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Default RE: 70 mph??? is it possible

I have the mamba max with the 5700 in a slash,I run 5000 mah 2 s lipoly's with great success.No heat issues plenty of torque and pretty good top speed.It will take off spinning from a dead stop on concrete.....I bought a brand new 7 cell venom battery just to run on the weekend before I got my lipoly's and I can tell you first hand try the lipoly's before you do anything else,the difference is night and day
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