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Old 04-17-2012, 07:59 PM   #1
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Default Brushless VS Brushed motor.

Well I'm sure this has been discussed plenty of times everywhere. I'm going to race a 2wd buggy at my local track and the rules are you can run stock class brushed or brushless motor. Or modified brushed or brushless motor. I'm planing on running in the stock class since I don't wanna destroy my buggy at first run. I haven't ran anything in a race since 97' so I guess I need to get back into the swing of things. I know that we are allowed to run in the stock class 27T brushed or 13.5T about 2500KV brushless motors both motors will give about the same speed. I'm just wondering since I have tons of stock brushed motors (Green Machine2, Slot Machine2, Tamiya Super Stock BZ, Yokomo Super Stock off road) would it be better for me to switch to brushless. I know that when you go higher KV then the Brushless motors shine with speed but will I see better performance out of a brushless motor in stock class. I have some of my on-road cars set up brushless (3000KV, 3900KV) not the fastest motors but they got plenty of speed. I guess I'm trying to see if its worth it for me to invest in a stock brushless set up.
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Old 04-17-2012, 09:08 PM   #2
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do brushed motors still exist!throw that junk out and spend the money!no comparison.
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Old 04-17-2012, 09:11 PM   #3
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I ran in a Rally series through the winter, and an asphault TC series last summer where the rule was 27T brushed or 17.5 brushless. I ran brushed, and aside from slight heat concerns I was able to keep up just fine.

A few of the other brushed guys had issues with dirt getting into the motor and causing "hung brushes"...basically, jamming the brush far enough away from the comm that the motor stops.

I think if they are letting 13.5 brushless motors in "stock", I'd rather have run the brushless. 13.5 is definately faster than 27T, and you get to stop worrying about brushes, springs, and dirt crumbing up the motor...
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Old 04-18-2012, 06:42 AM   #4
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I asked the same question when I got back into rc after a near 20 year hiatus from it. I had nothing but brushed motor experience. Brushed motors are cheap and if you have them then you may as well use them. Especially if you are on a budget. When I bought a brushless motor for the first time I was dumb founded by the shear amount of power that it had. No more cleaning the motor after each run. No motor rebuilds. No brush replacement. Just run it and done. I'm sold on them and am slowly converting everything over to brushless.

If you know it and have it, run it. It may be a good idea to just get out there and practice a bit before you upgrade anyways since in a stock class it's not all about pure speed but rather car setup and driving skill. However if you can afford to go brushless right now, do it. You'll love it.
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Old 04-18-2012, 09:15 AM   #5
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we are allowed to run in the stock class 27T brushed or 13.5T brushless motors
These motors are NOWHERE CLOSE in performance. A classic 27T brushed motor is about as fast as a modern day 21T brushless. A 13.5 is WAY WAY faster than the old stock motors... they are actually faster then a lot of the old mod motors.
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Old 04-18-2012, 09:25 AM   #6
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These motors are NOWHERE CLOSE in performance. A classic 27T brushed motor is about as fast as a modern day 21T brushless. A 13.5 is WAY WAY faster than the old stock motors... they are actually faster then a lot of the old mod motors.
+1 a 13.5 will blow a 27t brushed away not even close . Most tracks let you run 17.5 or 27t brushed . That being said a perfectly dyno tuned 27t brushed will beat a 17.5 by a little but does not stand a chance against a 13.5 .
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Old 04-18-2012, 11:39 AM   #7
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a perfectly dyno tuned 27t brushed will beat a 17.5 by a little
No way. Maybe the first gen 17.5s that came out 5 years ago or so, but not today.
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Old 04-18-2012, 12:05 PM   #8
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+1 a 13.5 will blow a 27t brushed away not even close . Most tracks let you run 17.5 or 27t brushed . That being said a perfectly dyno tuned 27t brushed will beat a 17.5 by a little but does not stand a chance against a 13.5 .
Your kidding yo self , 17.5 almost go as fast as a 8.5 now days...
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Old 04-18-2012, 12:05 PM   #9
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No way. Maybe the first gen 17.5s that came out 5 years ago or so, but not today.
Agreed!

Ive run a Reedy 17.5 in my B4 and it is a rocket with the right gearing.

Also, most 13.5t brushless motors are in the realm of 3000-3300 Kv. Looking at super stock classes, 13.5 brushless motors can run similar lap times to mod motors with a pile of boost.

Go brushless. Way less hassle. No more cutting brushes, lathing armatures, and dyno'ing.

Check again the rules for your track, because 17.5T is the most common off-road stock class. Several companies make really affordable stock brushless systems. You will have to drastically alter your gear ratio, because the brushless motors don't really come alive until they have a certain amount of load on them.

To give you an idea, I found the ideal gearing(for my local track) on my B4 to be 32 pinion, 69 spur. Running a reedy 17.5 on an LRP SPX esc.
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Old 04-18-2012, 12:45 PM   #10
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Yeah, as has been said. 13.5 is WAY faster than 27 turn. The idea behind stock is 17.5 blinky (no boost) is equal to 27t brushed (and I'd agree with that sentiment for the most part) but if you're allowed boost or more importantly, boost and 13.5 versus 27t. GOT BRUSHLESS.
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Old 04-18-2012, 12:54 PM   #11
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I should have been more precise in what I was saying . When I said 17.5 I meant 17.5 blinky .
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Old 04-18-2012, 12:59 PM   #12
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I should have been more precise in what I was saying . When I said 17.5 I meant 17.5 blinky .
Yes... even 17.5 blinky is WAY faster than a 27 turn brushed motor.
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Old 04-18-2012, 04:20 PM   #13
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Yes... even 17.5 blinky is WAY faster than a 27 turn brushed motor.
Maybe in some circumstances.

We had a spec class for Rustlers on a big dirt oval and the good 27T stock motors always beat the 17.5s. This was before advanced timing ESCs, so they were effectively all "blinky."
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Old 04-18-2012, 04:34 PM   #14
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No way. Maybe the first gen 17.5s that came out 5 years ago or so, but not today.
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Maybe in some circumstances.

We had a spec class for Rustlers on a big dirt oval and the good 27T stock motors always beat the 17.5s. This was before advanced timing ESCs, so they were effectively all "blinky."
yeah, you are talking about very early 17.5s. You can't compare them to the 17.5 motors of today, they are night and day.
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Old 04-18-2012, 04:35 PM   #15
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Your kidding yo self , 17.5 almost go as fast as a 8.5 now days...
You obviously never ran an 8.5t brushed motor as they are more than enough motor for the mod class by todays standards. 17.5 and 27t brushed motors are extremely close in performance, regardless of manufacturer.
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