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Old 09-10-2008, 08:45 PM   #1
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Default 4-cell gtb work with 6 cells and 17.5?

Just curious. Was planning taking off the fins on installing a cover for stock, but if the 4cell version will work it will save me the time and money.
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Old 09-10-2008, 08:48 PM   #2
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It'll work, just be sure to check the temps - I believe you can flip and PUT the Heatsink ON the 4 cell
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Old 09-10-2008, 09:04 PM   #3
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temps won't be an issue. I will be running it off road, but the onroad forum is a better place to ask about the 4-cell gtb since no one runs 4 cell offroad
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Old 09-11-2008, 03:10 AM   #4
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I was thinking about the same thing. I have a 4 cell GTB in my 12th scale now but wanted to see if I could use it in my RDX with 6 cell and 17.5 with the heatsink on of course.

Would like to give it a try this weekend.

Maybe Charlie will see this and give some input?
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Old 09-11-2008, 08:53 AM   #5
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Quote:
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I was thinking about the same thing. I have a 4 cell GTB in my 12th scale now but wanted to see if I could use it in my RDX with 6 cell and 17.5 with the heatsink on of course.

Would like to give it a try this weekend.

Maybe Charlie will see this and give some input?
Charlie will be on vacation, but you can email [email protected] or ask the question in his thread, here.
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Old 09-11-2008, 12:48 PM   #6
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Mahalo's

Will Do.
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Old 09-13-2008, 11:07 PM   #7
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I will be testing out the 4 Cell GTB in my RDX with 6 Cells and a Hacker 17.5 Brushless Motor tomorrow (weather permitting? )

I put the heatsink from my XBR esc on it as well as a fan just to be on the safe side.

Emailed Steve at Novak about this and he said it should work fine with the heatsink on there.
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Old 09-13-2008, 11:28 PM   #8
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I would like to know the answer to this as well as I have a 4-cell GTB I would like to use with 6 cells or lipo with a very mild motor 17.5 or 21.5. Just wondering if it was possible w/o damaging the 4-cell GTB esc.
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Old 09-13-2008, 11:33 PM   #9
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I'm running a 4 cell GTB in my Tamiya Mini without any problems. As previously mentioned, heat is the enemy. I run the bag off the thing, and it never even gets warm, nevermind hot.

The word I got from Novak, and others, is that the 4 cell is the same ESC as the 6 cell, but without the heat sink.

Jim
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Old 09-14-2008, 12:09 AM   #10
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Thanks for the info, Jim! I just did not want to be the first to take a chance. I would only be running 7.2 volts with mild motors so I imagined I would be fine.
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Old 09-16-2008, 01:11 AM   #11
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Well our race got rained out so I only got one run in with my 4cell GTB in my RDX running 6 cell and Hacker 17.5.

It ran smooth and was a nice improvement over my XBR esc

The motor ran cooler at around 160 and the esc was around 115.

Will most likely be keeping it in my RDX for now.
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Old 09-16-2008, 06:09 AM   #12
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I've run up to a 13.5 in offroad with a 4 cell GTB on LiPo without any problems. If you want to run a mild modified you'll need to have a fan blowing across the speedo but it works fine all the way to a 7.5 turn.
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Old 09-16-2008, 08:37 AM   #13
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Thanks for letting us know!
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Old 09-16-2008, 02:22 PM   #14
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Quote:
Originally Posted by monkeyracing View Post
I'm running a 4 cell GTB in my Tamiya Mini without any problems. As previously mentioned, heat is the enemy. I run the bag off the thing, and it never even gets warm, nevermind hot.

The word I got from Novak, and others, is that the 4 cell is the same ESC as the 6 cell, but without the heat sink.

Jim
I watched Charlie do quite a bit of work at the Snowbirds this year. I believe the only changes between the 4 and 6 cell GTB's are the heatsink and the gauge of wire used - 14 on the 6 cell version and 16 on the 4 cell version.
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Old 09-16-2008, 09:41 PM   #15
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One other thing to watch with the 4 cell is....If you are running a lipo is to not let it go below 6.0 volts. The 4 cell does not have the cutoff in it.
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