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Old 03-12-2011, 03:33 PM   #1
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Default New to racing on-road. Need LiPo advice.

So, after a month of racing on-road 1/10th TC at my local track, I've gravitated to the top of the B-Main. I'm running a Hobbywing 17.5 brushless motor w/hobbywing 60A esc and a 5000 MaH NiMh battery.

I've found myself directly between two classes... I stomp the B-Main field, finishing 2 laps faster than the 2nd place competitor, but when I hit A-main, I'm getting run over by the LiPo powered rockets.

So here's my scenario: Keep bouncing around between stomping B-main races, and getting stomped by A-main competitors, or upgrade my gear, and start stomping A-mains.

I think I want to step up, and run with the big-boys. This means I need LiPo advice. I've read many articles on LiPo but it's still a bit of a haze to me. Can anyone suggest a LiPo battery (I'll need two) and charger that will suit my needs? We can run max 5000 mah, and again, 17.5T brushless.

I don't want to spend a ton, as you can tell by my Hobbywing setup. I'm frugal in this situation, just because I don't want to spend more than what's necessary to have decent gear. But as (what I'd consider) a good driver, I'd like enough power to run with the big boys.

Thanks!
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Old 03-12-2011, 03:40 PM   #2
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If your running that close to the A then my guess is it's not in the battery but in the set-up. Try talking to the main guys and seee what they are running and what their set-ups are.
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Old 03-12-2011, 03:48 PM   #3
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First let me state that I have ZERO affiliation with Pro-Match. I can tell you from experience though, that they stand behind EVERY product they sell.


http://www.promatchracing.com/prodde...prod=2S580060C

That should be plenty of battery to get you in the mix with the A-mainers.

As for chargers,

http://www.promatchracing.com/prodde...hp?prod=B606AC

This a very good all around balance charger.
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Old 03-12-2011, 03:50 PM   #4
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Quote:
Originally Posted by hairy View Post
If your running that close to the A then my guess is it's not in the battery but in the set-up. Try talking to the main guys and seee what they are running and what their set-ups are.
Set-ups will have to be pretty different based on the big heavy NIMH pack he has strapped in his car.
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Old 03-12-2011, 04:15 PM   #5
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Ace lipo's there's a thread about them a page or so back.
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Old 03-12-2011, 04:18 PM   #6
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Quote:
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If your running that close to the A then my guess is it's not in the battery but in the set-up. Try talking to the main guys and seee what they are running and what their set-ups are.
Well the odd thing is that I'm winning B-Main class by 2.5 laps. A-main, I'm down 4-5 laps by the end of the race. My straight-away speeds SUUUCK. I'm geared up pretty well, finishing races around 125 degrees. I suppose I could gear up a bit more, but I figured it was the LiPo's that were really making the difference.
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Old 03-12-2011, 04:35 PM   #7
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Do you have to use batteries approved by ROAR? I wouldn't imagine so being in Canada.
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Old 03-12-2011, 04:42 PM   #8
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Quote:
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Do you have to use batteries approved by ROAR? I wouldn't imagine so being in Canada.
We have a max capacity of 5000 mAh in our batteries.
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Old 03-12-2011, 04:59 PM   #9
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Quote:
Originally Posted by Evoracer View Post
Do you have to use batteries approved by ROAR? I wouldn't imagine so being in Canada.
Roar mandates the rules for all of north america
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Old 03-12-2011, 05:07 PM   #10
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So maybe someone can clarify:

Is it the batteries that are making me slower? or is it my setup/driving that's making me slower?

Because I'll tell ya, these guys RIP ME APART on the straight-away, and even coming through the turns, they've just got a lot more umph than I do.

I could gear up a bit more, I've got room to do that, but I figured if I need LiPo's to compete, then I'll go that route.

I'm driving smooth lines, and as fast as I can go. I just don't have the overall power that the A-main drivers have running 17.5T
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Old 03-12-2011, 05:19 PM   #11
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Thanks Mike, Been awhile since I worried about ROAR membership.

Dadic, there's no way we can tell for sure what the problem may be, especially since we can't see your driving. Mechanically, it sounds like a gearing issue, although your batteries and even the esc can have alot to do with it. Are you running similar electronics ?? Is there motor timing or boost involved?? Regarding batteries...no doubt in my mind that they're not helping your situation. Even good NIMH batteries started losing voltage after a couple of minutes.
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Old 03-12-2011, 05:52 PM   #12
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Venom makes a nice 5000ma 50C 2s lipo that is very common for TC classes at my track.
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Old 03-12-2011, 06:21 PM   #13
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Dang he said with a red face....I missed that part. Never mind.
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Old 03-12-2011, 07:04 PM   #14
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Quote:
Originally Posted by Evoracer View Post
Are you running similar electronics ?? Is there motor timing or boost involved?? Regarding batteries...no doubt in my mind that they're not helping your situation. Even good NIMH batteries started losing voltage after a couple of minutes.
Well as far as electronics go, we're running TC Stock, so everyone is running a 17.5T brushless motor. I just find that as far as the guys running NiMh go, I'm the fastest, hands down. Then I challenge the LiPo guys, and I'm the slowest. This is where my lack of battery knowledge comes in to play.

Not too sure about the boost situation, but I am running my motor with as much timing as possible.

I guess what I'm still not too sure of is battery capacity, and output. Is the output level of a 5000Mah LiPo the same as the output capacity of a 5000 Mah NiMh?

If I can identify that my battery output level is equal, then I know to look at gearing/setup to increase my speed.
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Old 03-12-2011, 07:14 PM   #15
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yes and no. Both are 7.2 volt packs but nimh voltage output falls off much faster than lipo. Boost could give them an advantage. Need to find out if they use it. Your timing situation may not be helping you either. Advancing motor timing hurts torque...which means a little less punch out of corners.
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