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Old 10-07-2005, 01:30 PM   #466
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The approval is based on the size and stuff really.....they don't yank the cell apart....not sure how anyone would tech that anyways...

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Old 10-07-2005, 01:32 PM   #467
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Quote:
Originally Posted by josh69162
If IB keeps tweaking the cell, and GP remains in the competition, do you forsee any problems with legality in ROAR races? If the cell keeps getting faster and faster, would they ban these possibly to slow things down? Similar to the 10 or 12T motor limit... or is it too small of a difference?
-Josh
Josh-GP tweaked there batteries with every batch as well. The truth is-the internet and the quest for every minute detail wast as strong a few years ago. The first GP we all went gaga over (the competition was the Panasonic Stock metal Hydride) were 1.14 340 seconds I think. 6 months later we were looking at 1.158 and a year later 1.185!!
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Old 10-07-2005, 01:57 PM   #468
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The racers who feel they need the extra .01 of a volt may not like the fact that companies are tweaking there cells but in fact it's actually a great situation. When Sanyo was the only cell of choice they would have a few good date codes a year and that was it. So racers with allot of money would buy 10-15 packs and be set while racers on a budget would miss out on that batch.

With GP and now IB each batch has been as good if not better than the previous ones so when a racer needs new packs he knows he can get really good ones. The key is to only buy as many packs to get through your race day. When your packs start to fall off you can replace them and you should be able to get some that are as good if not better.
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Old 10-07-2005, 02:25 PM   #469
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Dunno if this is on topic or not, but whats the legality of these cells? Are these cells ROAR legal yet? Its not a huge concern to me because most of the races I attend aren't ROAR, but our local track is offically a ROAR track and some people have been raising the question.
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Old 10-07-2005, 02:28 PM   #470
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We submitted the IB3600 and IB3800 to ROAR and were waiting to hear back from them. I really don't see how these would not be legal as they are within the specs set by ROAR and are available. As soon as ROAR lets us know we will post it.
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Old 10-07-2005, 05:36 PM   #471
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Hey Danny- I just got my pack, and the numbers are flat out rediculous! And ray, 1.185's seem outdated now... I've got 1.196's sitting in my car with 420 seconds of runtime at 35 amps. 2.0 IR. One question though. How important is peak voltage? The numbers seem relatively scattered compared to the AV, which is all 1.196. I've got a 1.507, 1.492, 1.506, 1.493, 1.500, and 1.495. My logic is telling me since the charger charges each cell at the same rate, it would be more important for runtime and peak voltage to be the same, so the cells all peak at the same time. Wouldn't such scattered numbers overcharge certain cells? Obviously my logic is wrong, because it isn't done that way, so any insight would be good. And another question... I know you (Danny) said that higher IR at the same average voltage will have a higher voltage towards the end of the discharge. So on a larger scale, would a slightly higher IR be more beneficial in modified, since it can regulate the voltage better, giving more punch towards the end, when most batteries start to get flat?
-Josh
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Old 10-07-2005, 07:41 PM   #472
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I just charged my IB3800's for the first time today with a Pitbull charger. The delta peak was set at .028 and peak temp was 140-150 with a six amp linear charge rate. Is this temperature common or should I expect a decrease in temp next time I charge? I expected a 130 degree peak temperature.
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Old 10-08-2005, 01:49 AM   #473
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The PV is based on the cells temp which will be affected by the machine temp and contact of the cell holder. The key is that the cells will drop back at a similar time in the charge. Basically cells with similar runtimes will drop back at almost the same time.

Yes your theory of higher IR is a good one. The IR is so low on all the IB cells that I doubt that a 1.8 will be much different than a 2.0. Once again machine temp and the state of the cell holder contact will have an effect on the IR numbers.
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Old 10-08-2005, 01:50 AM   #474
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Quote:
Originally Posted by beerbarron
I just charged my IB3800's for the first time today with a Pitbull charger. The delta peak was set at .028 and peak temp was 140-150 with a six amp linear charge rate. Is this temperature common or should I expect a decrease in temp next time I charge? I expected a 130 degree peak temperature.
Set your peak detect at .018 and this will lower the temp. 140-150 isn't to high and based on most of our tests is near the ideal temperature.
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Old 10-08-2005, 02:31 AM   #475
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Quote:
Originally Posted by Danny/SMC
Set your peak detect at .018 and this will lower the temp. 140-150 isn't to high and based on most of our tests is near the ideal temperature.
How much is 140-150 in centigrad/Celsius?
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Old 10-08-2005, 06:55 AM   #476
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Quote:
Originally Posted by V12
How much is 140-150 in centigrad/Celsius?
(140-32)*5/9 = 60C
(150-32)*5/9 = 65.55C
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Old 10-08-2005, 06:57 AM   #477
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Celsius to Fahrenheit
C F
0 32
10 50
20 68
30 86
40 104
50 122
60 140
70 158
80 176
90 194
100 212
110 230
120 248
130 266
140 284
150 302
160 320
170 338
180 356
190 374
200 392
210 410
220 428
230 446
240 464
250 482
260 500
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Old 10-08-2005, 07:11 AM   #478
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Thanks guys for that informations.
But youre really charging that hot?
Dont have IBs until now but Im interested.
I just have GP 3300 now, you also charge these that hot?
Or does it have to do with the higher ambient temperatures you have.
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Old 10-08-2005, 07:25 AM   #479
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has it been common for the 38's to get hotter than the 33's? the 33's feel pretty warm, but comparatively, the 38's feel like im not quite sure why, but if it helps i have a pulsar2 set at 6.5a with a .2 peak detect.
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Old 10-08-2005, 09:45 AM   #480
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.2is to high you need .02 for the entire pack.

IB cells get hotter than GP cells because they are built differently and use different materials. This is why you need to keep the peak detects lower.
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