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Old 12-05-2004, 06:48 PM   #16
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well guess what, i ordered 3 sport packs today. cant wait till they get here and i can give them a try
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Old 12-05-2004, 07:10 PM   #17
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What are they?

This has got me stoked but how on earth can the Integys be 1.24?
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Old 12-05-2004, 07:26 PM   #18
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TEAM DURATRAX:Because they are not 1.24s. Integy does not do a 5000 sec run out and they only match at 20 amps.

ADAMKERRNZ: you will not be disapointed!
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Old 12-05-2004, 07:29 PM   #19
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Old 12-05-2004, 07:37 PM   #20
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Arun: how did you run yesterday hit 40 yet? See ya this weekend
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Old 12-05-2004, 08:19 PM   #21
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Quote:
Originally posted by Team Turtle
Arun: how did you run yesterday hit 40 yet? See ya this weekend
You mean 41? I've been hitting 40 pretty regularly. I nearly got 41 laps yesterday...until I ramped my car off the track . I did get a couple 7.2's though .
You should have seen the main...not too many cars made it through. See you Saturday.
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Old 12-05-2004, 08:43 PM   #22
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most matchers i have seen as of late, use a 6 amp charge... 6 amps seems to be industry standard now as far aswhat people use to charge... alot even do 7 amps, wich i do... a 1 amp higher charge rate, will not boost numbers...

the main thing alot of matchers do to boost numbers, is raise the room temperature.. the hotter the room, the higher the cell numbers...

technically if they match all cells at the same temperature it isnt boosting.. .. but i prefer a matcher that uses a normal room temperature.. ie what a track setting would be....

i think temperature has alot to do with all the companies with so called 1.19 packs at 30 amps... try this.. cycle a pack from a normal temperature. and keep the numbers... then take the same pak the next day.. put it inside a heating blanket till it gets quite warm.. then cycle it.. your numbers will go up a good amount... this is a little trick i have seen some of the top level guys do..
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Old 12-05-2004, 09:36 PM   #23
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Hi Burbs,

I have been talking to a guy formerly from the GM research division who worked on the electric car. He was telling me that when you raise the temperature of an Nimh cell it allows the Chemical reactions in the cell to work faster, this helps a little with voltage but a lot with internal resistance. The down side is the lifecycle of the cell is shortened. Obviously the top guys do not care about this.
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Old 12-05-2004, 10:26 PM   #24
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Interesting points...maybe I'll check a "blankie" with me next time I travel to a race so I can pre-heat my cells!! LOL!!
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Old 12-06-2004, 03:36 AM   #25
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Any of you guys have proper matching equipment?
I mean I highly suspect any matched cells to be able to produce the same runtimes with the same voltages consistently.
My inference is that the numbers are actually the average voltage and average runtime over 3 matching cycles. From what I've seen with a modest CDC discharger @20A, almost all the cells from 1 matched pack do not produce the same numbers. I have not been able to actually perform multiple cycles for each cell of each pack. For instance, on 1 pack of 1.159V 417s that i have,
cell:
1. avg 1.170 3200mah
2. avg 1.140 3180mah

and so on, with the numbers creating a range from 1.140 to 1.170
and runtimes within 7% from total average. Bear in mind these are 20A numbers with totally different matching equipment. I'm not even comparing these with the labels, just against each other. And against each other we can see that they are way different in terms of output. Which leads me to conclude:

Matched cell numbers are actually only an average of a few cycles, and each cycle might actually produce vastly different numbers from the next.

Is it true?
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Old 12-06-2004, 03:50 AM   #26
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adamkerrnz:
how did you pay for the hypercells? shipping prices?
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Old 12-06-2004, 04:44 AM   #27
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I'm deffinaly going to try them out.

My saying is, Ill give any company a shot.
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Old 12-06-2004, 06:27 AM   #28
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Lee,

Check out my web site, there is a lot of data for multiple cycles on the same set of cells. I usually run 8 cycles with an 11hr gap between each cycle and I average out the last three cycles of each charge method. The numbers are very consistant, voltage goes down a little, run time usually goes up a little and I equalize between cycles. There is a better explanation on the web site.

Chris.

http://www.citlink.net/~kpngtrak/CDAT_Home.htm
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Old 12-06-2004, 07:26 AM   #29
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Quote:
Originally posted by crimson eagle
Lee,

Check out my web site, there is a lot of data for multiple cycles on the same set of cells. I usually run 8 cycles with an 11hr gap between each cycle and I average out the last three cycles of each charge method. The numbers are very consistant, voltage goes down a little, run time usually goes up a little and I equalize between cycles. There is a better explanation on the web site.

Chris.

http://www.citlink.net/~kpngtrak/CDAT_Home.htm
i really like where you're going with the content of your site.
Keep it up
I guess my discharger is at fault for not being able to churn out more consistent numbers.

May i know what is 'Pulse' charging? is it the same as trickle charging? Flex charging?
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Old 12-06-2004, 07:50 AM   #30
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Lee,

Pulse Charging, also known as burp charging has a very small dishcarge pulse every second. The theory is that it helps to break down the crystaline structure which forma in the cell over time. I read an interesting Nasa study about it a while ago. They found that it really helped to extend the lifecycle of the cell. I'd like to do extended cycles for things like this but I don't have a charger to dedicate to it for 6 months and I certainly don't have the cells to throw away.

Chris.
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