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Old 02-03-2004, 06:08 AM   #1
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Default Discharge 20 vs 30 amp?

OK, a post in another forum in here mention that if you dischage a 1.18 pack at 20 amps it drops it to 1.15. Does any one an actual chart for 1.15 and up and at different discharge rates 20, 25, 30 etc?
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Old 02-03-2004, 06:33 AM   #2
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that 1.18 pack,was it a 30A pack in the 1st place?
the general understanding is that if a pack is discharged at LOWER than the current during matching,the voltage should read HIGHER.
but here we go again about packs showing less than the labels...there's a thousand argument in each way!
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Old 02-03-2004, 07:25 AM   #3
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Correct me if I aqm wrong but every 5 amps yeilds a 0.10 difference.
So a 1.180 pack matched at 20 amps will be around 1.160 matched at 30 amps.
But that's only in theory. The reason many matchers use 30 amps (soon SMC will match at 35 amps) is to weed out the week cells and see which ones can take the stress that today's racing can dish out.
Please keep in mind that a pack that performs well at 20 amps may not be able to perform well at 30 amps.
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Old 02-03-2004, 09:50 AM   #4
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Quote:
Originally posted by lee82gx
that 1.18 pack,was it a 30A pack in the 1st place?
the general understanding is that if a pack is discharged at LOWER than the current during matching,the voltage should read HIGHER.
but here we go again about packs showing less than the labels...there's a thousand argument in each way!
I don't want any labeling crap to start up... I want to know if you take identical packs and did the 20 amp on 1 and 30 on the other what kind of performace it would be.
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Old 02-03-2004, 09:56 AM   #5
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If the packs are IDENTICAL (performance wise) with the only difference being that one was matched at 20 amps and the other was matched at 30 amps, the performance of both packs, in your car, should be identical.
The numbers on the label for the 30 amp matched pack would be lower than the numbers of those on the 20 amp pack however.
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Old 02-03-2004, 11:57 AM   #6
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Quote:
Originally posted by Nova F1 Racer
I don't want any labeling crap to start up... I want to know if you take identical packs and did the 20 amp on 1 and 30 on the other what kind of performace it would be.
if there are 2 packs that are matched using the exact same parameters and yield identical numbers, then if you only discharge one pack at 20amp thru its entire life and the other one at 30amp, then the pack that is discharged at 30amp will have higher punch and lower runtime and vice versa for the pack discharged at 20amp
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Old 02-03-2004, 11:59 AM   #7
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If you race stock you can get away with 20 amps, but if you race mod stick with 30 amps or more, since that is closer to what a mod motor will be pulling.
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Old 02-03-2004, 04:16 PM   #8
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some people says that more than 20amps put much stress on the cells.....

but i think discharging at 30 amps, depends on the class you run, like touring modified, is the best discharging rate, because you'll draw amps like running the battery on the track......
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Old 02-03-2004, 05:31 PM   #9
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Quote:
Originally posted by SalvadoriRacing
some people says that more than 20amps put much stress on the cells.....

but i think discharging as 30 amps, depends on the class you run, like touring modified, is the best discharging rate, because you'll draw amps like running the battery on the track......
That's what I thought I had read somewhere but I'd rather make sure then assume.....
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