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Old 11-18-2001, 07:01 PM   #1
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Default RC3000HV Abuse Test

Just wanted to post results of an interesting test I did today.
After cycling packs with 2-3 hours rest 3 times in one day I have found that the numbers are pretty much the same on my T-35.

The key to get the HV's to run well on the track is to get them warm as you charge them. Someone mentioned to me that he feels they need to reach 135-145 degrees to run strong and consistant at there maximum potential.

Here are the results of 3 cycles I did today on the same pack. The numbers that I will post are in the following order.

runtime - Avg. Volt. - Avg.V @ 4 volts - Actual IR.

#1: 348 - 4.56 - 4.59 - 16.7
comments: This cycle was done with a 1 peak charge using 10 amps with a .07 peak detect. The discharge rate is 30.

#2: 345 - 4.54 - 4.57 - 16.7
comments: This cycle was done 3 hours later but I precharged the pack for 1000 seconds and then discharged it. I waited 15 minutes and then cycled it using a 2 peak charge using 6 amps and .05 - .03 peak detects. 30 amp discharge.

#3: 346 - 4.55 - 4.57 - 16.7
comments: This cycle was started 500 seconds after cycle 2 was completed. I used a 10 amp 1 peak charge with a .07 peak detect. 30 amp discharge.

As you can see cycle 3 was really surprising considering the pack only rested 9 minutes or so from the previous cycle.

I'm not reccomending that racers use their packs multiple times a day but so far this new cell seems pretty robust and consistant.
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Old 11-19-2001, 12:37 AM   #2
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Danny:

Hi,

I have a couple of questions for you.

1). I ran our 2400's today in stock touring/foam. thet were fast up front but seemed to trail off around 3 1/2 to 4 minutes. I have been traying them after each race day and leaving them in the trays all week long. (Pro-match smart tray 2). does traying them slow them down???

2). we ran both SMH cells and 300HV's today in the qualifiers. we found that the 3000HV's seem to be better from mid race to the end. the SMH's are not mine they were lent to us by a Team driver I did motors for. is this normal???? I never have really raced the SMH's before this weekend. (Cleveland warmups at our track). Chuck Lonergan was FAST. not sure what SMC cells he was running but it was all my son could do to try to stay with him. (he ended up 3rd after some ...altercations with back markers).

any tips on what I have done wrong would be a great help

Thanks

DaWrench
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Old 11-19-2001, 09:22 AM   #3
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I don't think your doing anything wrong. The newer style NiMH's are a bit faster than RC-2400's.

We have tested SMH's vs HV's vs 2400's and the 3000's in stock sedan 5 minutes and with a perfect run you can go 5-6 seconds faster with 3000's and the HV's are 2 seconds faster than SMH's because they finish stronger.
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Old 11-19-2001, 11:08 PM   #4
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Danny:

Hi,

Thanks for the post. I ws thinking I had done something wrong with the 2400's. I have some 3000's (not HV's) that are faster in stock sedans than my 2400's. I have run them before and thought it was just the way I geared them. there were some guys running the old 2000's at our club with the blue end bell Paradox motors (handouts for Cleveland) I think they were looking for more punch as run time doesn't seem to be a factor with these motors.

Thanks

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Old 11-20-2001, 08:00 AM   #5
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Hi Danny, I have just cycled one of my 3000HV packs on a 10A charge, 0.06v and 30A discharge. Its a 6 cell pack. How are these numbers?

30A

SEC 358
AIR 24.5
AVG 6.83V
@1V 6.87V

20A

SEC 528
AIR 24.0
AVG 7.14V
@1V 7.15V

I found out that like what you have mentioned, these cells seems to perform better while its hotter i.e higher amp charge and discharge, what do you think?

I have problems setting a 0.07V peak on my T-35, the Volt Too Hi message will appear during cycling, even with a 0.06V it sometimes happens too, anyway to solve this?
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Old 11-20-2001, 12:43 PM   #6
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GKC: Yes some T-35/T-30 have problems with the extra voltage of these newer cells.

Try to put the discharge on 7 cells and put the cutoff at 5.4 that should fix the problem.

Next time you race try .07 or .09 to see what you prefer.

Your numbers look alright. What were the numbers on the cells ?
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Old 11-20-2001, 03:37 PM   #7
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Thanks for the tip!

The cells numbers at 20A are around 535 secs and 1.183V

There seems to be a slight drop in runtime but also a slight gain in voltage.
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Old 11-20-2001, 04:43 PM   #8
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Actually 535 should be 356 @ 30 and typically the HV's will put out a bit more mAh at a higher load.
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Old 11-21-2001, 03:23 PM   #9
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Default GOOD LUCK

Good luck to SMC drivers in Cleveland!
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Old 11-22-2001, 06:59 AM   #10
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Danny, I currently run stock touring car 5 minute heats on rubber tires. I am in the process fo purchasing new batteries. Which cells would you reccomend for this class. I race about twice a month.

BTW do you know if any hobby shops carry your procucts in the Toronto area.

Thanks

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Old 11-22-2001, 03:16 PM   #11
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Hey Danny, I noticed on Stormer Hobbies web Site that the different levels of cells were 1.145+ and then cells under 1.145. How soon do you think u will have some more of the over 1.145 cells? Thanks.
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Old 11-22-2001, 05:33 PM   #12
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anyone ever notice the voltage going up during a discharge with these new cells. I saw this once on my T35 while I was discharging a pack that wasn't used. And it went up like 4 one-hundreds. I kinda brushed it off thinking I was a little crazy but the other day we were watching another pack on someone else's t35 and the same thing happenned. It was around 6.5- volts or so.

any comments on what would cause that?
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Old 11-22-2001, 09:32 PM   #13
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I have seen mine do that a couple times.

The voltage will be going 7.21 - 7.20 - 7.19, then for some reason it will go 7.28, then right back to 7.18, 7.17, etc

I assume it is some glitch in the T35 - Doesn't do it everytime, but now and again it seems. Maybe mine needs a tune-up....lol..
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Old 11-22-2001, 09:58 PM   #14
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My t35 does the same thing. I call CE and talked to the service guy and he said it was normal and they all do it. I forgot exactly why it happens but he said if you watch close it does it during every discharge. I have ben watching ,when I have time, and it does it every time.
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Old 11-22-2001, 10:30 PM   #15
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On the CE35's....they take a reading at or near the 100 second mark........so it stops discharging at that point. Have never heard WHY yet though.

I have a DVM that can record everything through my PC....and the charger stops discharging for about 1.5 seconds, then continues on.
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