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11-28-2008, 06:33 PM
| #1 |
| Mud Duck   Join Date: Jul 2008 Location: Hudson, Minnesconsin
Posts: 591
|  Rebel2/lipo probs I've got a little PTI basher/ rock racer & I'm running a 24-turn motor 18pinion/87spur w/rebel2 & 3-cell,10 or 12c lipos...The li-pos get pretty hot, and one by one have become useless.. Do I need to go up in amp rating (like 20 or 25c)?.... Li-po's are TOO EXPENSIVE (and dangerous!) for me to trial-and-error.. If 10c is okay, maybe I'm just not buying from a good source... Any feedback? |
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11-28-2008, 06:35 PM
| #2 |
| .   Join Date: Nov 2005 Location: Rock chucking territory
Posts: 9,518
| For one you have no lipo cutoff, a 11.1 volt lipo needs to be shut down when it reaches 9 volts. |
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11-28-2008, 07:07 PM
| #3 |
| Mud Duck Join Date: Jul 2008 Location: Hudson, Minnesconsin
Posts: 591
| I'm using a 3-cell monitor that flashes & beeps as you approach 9v... I've been careful not to over-discharge and I check the packs w/ a multi-meter often... |
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11-29-2008, 08:44 AM
| #4 |
| Mud Duck Join Date: Jul 2008 Location: Hudson, Minnesconsin
Posts: 591
| Anyone?...anyone?...Bueller? |
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11-29-2008, 09:00 AM
| #5 |
| RCC Addict Join Date: Nov 2007 Location: Nine Mile Falls, WA
Posts: 1,238
| Your clearly over amping the packs. a 24T motor will peak over 80 amps easy. Heck I have had a 27T epic peak in that area. You basically have a buggy motor that needs either higher C rated smaller packs like something in a 30C to 35C range or a normal pack that would be used with that motor like a 20C 5000 or 6000 pack. Unfortunately you won't find any smaller higher c rated packs to do what you want. Even a smaller 2200 25C pack is only going to be able to do 55 amps. Jason |
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11-29-2008, 11:33 AM
| #6 |
| Mud Duck Join Date: Jul 2008 Location: Hudson, Minnesconsin
Posts: 591
| Thanx jason...so I'll need to go to a higher-turned motor.. Will a 40-turn draw less than 55amps? |
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11-29-2008, 01:31 PM
| #7 |
| RCC Addict Join Date: Nov 2007 Location: Nine Mile Falls, WA
Posts: 1,238
| That's the trouble if you take say a 35T or a 45T and gear them for speed your going to increase the amp draw where a larger pack will be needed. Maybe not as large as say what the 24T would need but you'd still need to be careful. In crawling situations I run a 45T on a 3S 1100. And many guys running bergs will use either a 3S 2000 2100 or our 25C 2200. But they are geared for crawling. It's tough to get a good rock racer set-up going with a small pack because in most cases you are in fact building a racing buggy that need a regular race pack. Jason |
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11-29-2008, 02:58 PM
| #8 |
| Mud Duck Join Date: Jul 2008 Location: Hudson, Minnesconsin
Posts: 591
| Thanx for all the help, Jason..I'll see what I can do... |
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12-02-2008, 09:26 PM
| #9 |
| RCC Addict  Join Date: Feb 2006 Location: Campbell, CA 4 hrs 2Rubicon !
Posts: 1,896
| good feedback seems like there is so much to learn about lipo |
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12-02-2008, 09:41 PM
| #10 |
| owner, Holmes Hobbies LLC  Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 14,855
| Yep, Jason is spot on. If you want to go fast, you have a use a battery with lots of power. Some new 40C cells just came out from TP, but you will probably pay a premium and experience very short runtimes. 40c, that is draining the pack in 1.5 minutes! |
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