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Old 06-24-2011, 05:02 PM   #16
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Originally Posted by portyansky View Post
Here is an easy formula for you to follow:
mah x C rating = amps
Amps translates to torque (punch).
So for example:
5000mah 20c lipo will have 100amps (5 x 20 = 100)
Where a 4000mah 30c will have 120amps (4 x 30 = 120)

What you have to do is figure out the max continuous amperage your esc and motor need, and go from there.

You said that they are running a 3600 40c (144amps) and a 5000 40c (200amps). My logical guess here would be the the guys running the 3600s are lighter.

Edit: Another big factor in punch would be gearing.
yes good info, but heres the Rub.... THERE IS NO STANDARD TEST FOR DETERMING A 'C' RATING, each company CAN come up with whatever number they wish to use, depending on which one of the many tests to achieve the c rating they use.
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Old 06-24-2011, 05:13 PM   #17
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Even some of the manufacters (resellers actually) state that lipo's
MUST NOT be run at the ridiculously high amperage calcuated by "mah x C rating"
This is theoretical amp spec only

The other thing's to consider are
the power of suggestion is quite powerfull, if some one honestly believes a higher C will have more punch, thats what they may think is happening regardless: with the higher turn motors anyway
This is why even some silvercan racers claim huge improvements with 50c batts
Higher C batts may just have better chemistry, giving better performance thats nothing to do with the C rating

As for some batts warming up quicker in the same race class, i would have thought this would be from higher internal resistance.
Higher internal resistance cannot be better.
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Old 06-24-2011, 08:43 PM   #18
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I understand that you guys are concerned about battery punch etc..., but to me the other part of the equation, namely gas mileage, is equally important!!! How are you sure that your car is not using too much current to go around the track? Also taking your driving style into account! Did you build it right? Ceramic bearings? Do you wax your car??? It can add up guys!!! I once ran a 6minute main with a tp4200 40c in my 3.5R tc4 , taking all of the above into account, and after the main I only had to put a 2200mah charge to fully charge the pack!!! I never had punch issues or infield issues, and I am way overgeared at 8.4 fdr.....
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