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Old 06-25-2009, 09:28 PM   #1
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Default lipo with brushed motors???

hello .. im in a process of switching to lipo batteries, i currently have a trinity 27t co27 brushed motor in my rc car and i just herd that you cant run lipo with brushed motors is that true? or whoever said that is on crack.
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Old 06-25-2009, 09:35 PM   #2
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Default You can but...

Why would you want to? Lipo and their run time capability, you can run forever if you go brushless. Brushed....will enjoy the juice, but the run time well....spend the coins and go brushless.
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Old 06-25-2009, 09:41 PM   #3
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Why would you want to? Lipo and their run time capability, you can run forever if you go brushless. Brushed....will enjoy the juice, but the run time well....spend the coins and go brushless.
yeah im in a process of slowly switching to lipo and then definately getting a brushless motor just doing it one buy one as the funds comes in.
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Old 06-25-2009, 09:47 PM   #4
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As you are buying things to go brushless make sure you get a speedo first sence most brushless motors are sensored now so your old speedo wont work with the brushless motors
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Old 06-25-2009, 10:28 PM   #5
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hello .. im in a process of switching to lipo batteries, i currently have a trinity 27t co27 brushed motor in my rc car and i just herd that you cant run lipo with brushed motors is that true? or whoever said that is on crack.
the person who said that was on crack, i have been using lipo's for a while with my 27t while i got some money to get a brushless system
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Old 06-25-2009, 10:35 PM   #6
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Default Same but different

I have a LRP sphere BL system but have not switched to LIPO as of yet. I'm still sitting on the fence on what charger/battery to purchase. Running old matched cells are killing me!
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Old 06-25-2009, 11:58 PM   #7
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In stock class I still run brushed 27t motors with my 5300 40C Lipo's and they move. I got booted from stock class too. (Have to run 13.5 now) Alot of power for them 27t though. Just have to monitor your gearing, runtime, and heat or your going toast them. I still had alot of really good brushed motors, so I'm going use them. :P I also have a TC spec and 13.5's too.
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Old 06-26-2009, 01:11 AM   #8
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Just wondering if you can use a lipo battery with older speed controls made for brushed motors. Like a Novak Cyclone or GTX.
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Old 06-26-2009, 01:16 AM   #9
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Just wondering if you can use a lipo battery with older speed controls made for brushed motors. Like a Novak Cyclone or GTX.
Yes. I use a GT7 in stock class with those Lipo's.

Here's a pic of the set up. GT7 and a stock trinity 27t brushed

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Old 06-26-2009, 01:35 AM   #10
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Good to know!
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Old 06-26-2009, 09:05 AM   #11
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With older speed controls, you just have to make sure that your not running the lipo battery all the way down. The older speed controls do not have a low-voltage cutoff to protect the lipo. If the lipo goes flat, it's done. The next time you try to charge it, it my go up in flames...

That being said, I run Co27 race-prepped with a single wimpy Orion 2400mah 20C lipo and an old KO Propo VFS-1 ESC. In our 4 minute heats I use around ~800mah, so runtime is not a problem. After the heat, I simply charge it back up. It's easily as fast as my Matched IB4600 Nimh packs were at the top of their game. Nimh sucks cause they require so much constant attention and care. Plus they MUST be fresh off the charger for max performance which is not always possible.

The only drawback to lipo is finding one that fits your car AND needs. Also there's the fact that you have to buy a new charger (balance charger recommended).

IMO: Going Lipo is a much bigger jump in performance than going brushless. A well built 27T motor can out-power a 17.5T (with a typical ESC). If you like working on motors, brushed may still be for you. Newer ESC tech is making the brushless faster everyday. It's kinda funny cause brushless doesn't really compare considering they get adjustable timing, ball-bearings, and other tricks...

Last edited by 94eg!; 06-26-2009 at 09:17 AM.
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Old 06-26-2009, 12:39 PM   #12
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Originally Posted by 94eg! View Post
With older speed controls, you just have to make sure that your not running the lipo battery all the way down. The older speed controls do not have a low-voltage cutoff to protect the lipo. If the lipo goes flat, it's done. The next time you try to charge it, it my go up in flames...

That being said, I run Co27 race-prepped with a single wimpy Orion 2400mah 20C lipo and an old KO Propo VFS-1 ESC. In our 4 minute heats I use around ~800mah, so runtime is not a problem. After the heat, I simply charge it back up. It's easily as fast as my Matched IB4600 Nimh packs were at the top of their game. Nimh sucks cause they require so much constant attention and care. Plus they MUST be fresh off the charger for max performance which is not always possible.

The only drawback to lipo is finding one that fits your car AND needs. Also there's the fact that you have to buy a new charger (balance charger recommended).

IMO: Going Lipo is a much bigger jump in performance than going brushless. A well built 27T motor can out-power a 17.5T (with a typical ESC). If you like working on motors, brushed may still be for you. Newer ESC tech is making the brushless faster everyday. It's kinda funny cause brushless doesn't really compare considering they get adjustable timing, ball-bearings, and other tricks...
Got ya. im not much of an EE so how would I create an inline low voltage cut off? Or should I just keep track of the Mah as you do?
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Old 06-26-2009, 02:47 PM   #13
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If you want to run lipo batteries with an older speed control that does not have lipo cut-off, you can use a lipo cut-off module. Here is a link to the modules that Novak sells (http://www.teamnovak.com/products/li...ule/index.html). This 2S Novak module retails for $25 on Tower Hobbies.

An example where this type of module can come in handy is Tamiya Championship Series classes like the Mini-Coopers. Why buy a high end speed control with lipo cut-off to power a silver can motor? Lipo batteries are legal in the Mini-Cooper class, so you might as well get some more life out of a perfectly good small brushed speed control.
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Old 06-26-2009, 03:00 PM   #14
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I believe Novak makes 2S lipo cut-offs that can be hooked up to any speed control to safely run lipo batteries, even if it is an old non-Novak speedo!!! I personally run a CO27 with a LRP IPC STOCK ,and a CHAMELEON 2 PRO with a LRP IPC v7.1, both with Novak 2S lipo cut-offs without any issues at all. I actually had to regear these cars two to three teeth higher due to the low lipo battery weight(225g) compared to Nimh(450g+)!!! On top of better car balancing in my TC4s ,I definitely have more top end than any of the 17.5R and 13.5R brushless out there, but I lack a little on the bottom end : brushed motors would be better on high-speed flowing tracks, and brushless would be slightly better on short tracks. All in all I have too many good trinity motors and too many good LRP speedos to switch to brushless systems for stock and 19t !!! I reserve brushless for MOD only, but I think switching from NIMH to LIPO 40C is a MUST if you want a podium finish !!!
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Old 06-26-2009, 03:17 PM   #15
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Originally Posted by bxpitbull View Post
Why would you want to? Lipo and their run time capability, you can run forever if you go brushless. Brushed....will enjoy the juice, but the run time well....spend the coins and go brushless.
Sry a little off topic..

So a brushless system will consume less juice than a brushed one? I always thought it was the other way around..
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