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Old 07-05-2005, 11:08 PM   #121
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Quote:
Originally Posted by bigdog xxx-s
Ray-

Who's 3800 packs are you running?

Also, what are all the companies currenly offering 3800?

I see Pro Match, Powerpush, and EA Motorsports shortly and of course SMC. Just wondering who else is.

Thanks,

Mike T
For the last few years I have been running SMC packs. First were the GP3300's, then the IB3600 and now the IB3800's.

The packs deadshorted still have massive Mah's. I tried step charging them on the advantage harger. Definately gets all the Mah in the pack, but packs are peaking cooler. I am starting at 0.5 for 50mah, then 7 till 2500 and then finish them at 5.5 for 19t. I had runtime to spare as you can imagine.

Unfortunatelt tonight my drivetrain was bound up so my motors were getting to 200 degrees every run. Car slowed about 0.5 per lap near end of run-but the batteries didnt dump.

Ray
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Old 07-05-2005, 11:30 PM   #122
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I have a few packs coming and can't wait to try them. Does anyone know the weight difference between 3600 and 3800 cells? Would only zapped packs be now good enough for stock racing since they have good voltage and no chance of dumping them.?
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Old 07-05-2005, 11:32 PM   #123
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Quote:
Originally Posted by rayhuang
For the last few years I have been running SMC packs. First were the GP3300's, then the IB3600 and now the IB3800's.

The packs deadshorted still have massive Mah's. I tried step charging them on the advantage harger. Definately gets all the Mah in the pack, but packs are peaking cooler. I am starting at 0.5 for 50mah, then 7 till 2500 and then finish them at 5.5 for 19t. I had runtime to spare as you can imagine.

Unfortunatelt tonight my drivetrain was bound up so my motors were getting to 200 degrees every run. Car slowed about 0.5 per lap near end of run-but the batteries didnt dump.

Ray
Ray What is actually your motor temp in normal? thanks
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Old 07-06-2005, 12:00 AM   #124
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Quote:
Originally Posted by EngTat
Ray What is actually your motor temp in normal? thanks
It depends on a lot-but I dont like to see stocks much higher than 165 and 19t maybe 180 tops-but even thats a lot. I think when they get that hot-your laptimes are going to drop. AT 200 I think the magnets didnt feel as strong so thats not good.
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Old 07-06-2005, 02:05 AM   #125
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Josh .... best packs are 1.185 + volts with runtime between 460-490 secs. I will check postage rates to the USA and post them here for anyone interested.
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Old 07-06-2005, 03:50 AM   #126
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Quote:
Originally Posted by danjoy25
I have a few packs coming and can't wait to try them. Does anyone know the weight difference between 3600 and 3800 cells? Would only zapped packs be now good enough for stock racing since they have good voltage and no chance of dumping them.?
If I am not wrong, IB3600 weight 62-63g while IB3800 weight 66-67g.
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Old 07-06-2005, 06:58 PM   #127
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can these be charged with an old millenium pro?
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Old 07-06-2005, 07:30 PM   #128
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Quote:
Originally Posted by KillWency
can these be charged with an old millenium pro?
You can charge IB cells with Millenium Pro but I see a lot of false peak.
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Old 07-06-2005, 07:32 PM   #129
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Quote:
Originally Posted by Tempest2000
I use a standard linear charge at 6 amps with a .03 cut off on most chargers.
I like the batteries to cut off 120-130 F or so.
I have some people that use step charging with much more chargers. Let me know and if you need that info I'll get it to you.

Michael
Can you please post the STEP CHARGING info that your people used ?

Thanx

Henry E.
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Old 07-06-2005, 07:42 PM   #130
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I bought three 4-cell IB3800 packs from a big matcher and unfortunately one pack vented on the first charge. Although these are not SMC batteries, I was following the guidelines posted on smc-racing.com because it was one of the few places I could find published guildelines. (6A linear, 20millivolt peak).

The matcher is replacing my pack, luckily for me, but they strongly suggest a 5A max charge rate and not 6A. I charged two other packs (from the same matcher) of IB3800 at 6A with no problems.

Of course now I am nervous about charging at 6A since that was my first cell failure ever. I have read and heard other matchers recommending 5A max also, but as we all know you ask 10 people how they charge and you'll get 10 different answers. I hate to give up the extra punch that 6A charging can give you for stock racing.

So the questions..
Is this matcher being overly cautious by recommending 5A charging max for these cells?
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Old 07-06-2005, 07:58 PM   #131
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I charged mine at 7 amps on a .03 delta peak no problem on three packs. Whatever problem you experienced I dont think has anythng to do with the charge rate. Maybe somethng went haywire in one cell and it didnt revela itself till the cell was soldered into a pack.
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Old 07-06-2005, 08:14 PM   #132
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Where can I get a hold of SMC IB 3800's?
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Old 07-06-2005, 08:21 PM   #133
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Quote:
Originally Posted by rayhuang
I charged mine at 7 amps on a .03 delta peak no problem on three packs. Whatever problem you experienced I dont think has anythng to do with the charge rate. Maybe somethng went haywire in one cell and it didnt revela itself till the cell was soldered into a pack.
What effect will a 30 millivolt peak detect have compared to a 20 millivolt?

My Competiton Electronics PitBull X3 false peaks at 20 millivolts while charging these same IB3800. Maybe I should try the 30 millivolt? My LRP Pulsar 2 doesn't false peak at 20 millivolts. Weirdness.

I am being a big sissy with my batteries since that one vented on me. That totally ruined my race day and I don't want to repeat that.

Thanks for the help! I need it!
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Old 07-06-2005, 08:23 PM   #134
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Quote:
Originally Posted by HarshGuy
Where can I get a hold of SMC IB 3800's?
Ah ha! You too!
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Old 07-06-2005, 08:28 PM   #135
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Quote:
Originally Posted by Rysuleod
What effect will a 30 millivolt peak detect have compared to a 20 millivolt?

My Competiton Electronics PitBull X3 false peaks at 20 millivolts while charging these same IB3800. Maybe I should try the 30 millivolt? My LRP Pulsar 2 doesn't false peak at 20 millivolts. Weirdness.

I am being a big sissy with my batteries since that one vented on me. That totally ruined my race day and I don't want to repeat that.

Thanks for the help! I need it!
I am yet to use 20 millivolt for any charging needs. Was thinking that cutoff was potentially too low.

FYI...My Pitbull X3 has been a pretty reliable charger.

Bill
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