R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 04-14-2006, 09:40 AM   #136
Tech Apprentice
 
brownpants's Avatar
 
Join Date: Mar 2006
Location: Essex UK
Posts: 56
Default

Surely there has got to be a limit as to the capacity the cells can hold without making them larger?
As said earlier in the thread, the cars last the duration with ease. So there is no need for bigger cells?

Darren
brownpants is offline   Reply With Quote
Old 04-14-2006, 10:12 AM   #137
Company Representative
 
Danny/SMC's Avatar
 
Join Date: Oct 2001
Location: Elkton, VA
Posts: 3,097
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by WorldCup2004
GP has the technology that other don't have, many IB are good until the vent.....

Not sure if you were at the DHI cup but I was there and Marc Rheinhards car had a GP cell vent severly while running his practice main.

Bottom line is all cell manufacturers are pushing the limits to achieve maximum performance.
Danny/SMC is offline   Reply With Quote
Old 04-14-2006, 04:15 PM   #138
Tech Apprentice
 
Frank N. Furter's Avatar
 
Join Date: Feb 2006
Posts: 93
Default

Quote:
Not sure if you were at the DHI cup but I was there and Marc Rheinhards car had a GP cell vent severly while running his practice main.

Bottom line is all cell manufacturers are pushing the limits to achieve maximum performance.
Yes, they are all pushing the limits and some of them are over-stepping them!

So one GP cell vented and how may IB's have?
Frank N. Furter is offline   Reply With Quote
Old 04-14-2006, 04:25 PM   #139
Company Representative
 
Danny/SMC's Avatar
 
Join Date: Oct 2001
Location: Elkton, VA
Posts: 3,097
Trader Rating: 2 (100%+)
Default

We ran the same 2 packs both days at the DHI cup in Paul Lemieuxs car and none vented. I also believe Victor Wilck had no cells vent at that race.

Venting normally occurs when to high of a peak detect is used. Intllect cells require low peak detects.
Danny/SMC is offline   Reply With Quote
Old 04-14-2006, 04:38 PM   #140
Tech Elite
 
Chris08527's Avatar
 
Join Date: Dec 2003
Location: 732
Posts: 2,154
Trader Rating: 16 (100%+)
Default

danny

do you have suggestions for setting peak detect on IB38's on a gfx???
__________________
"Hello How 'bout that ride in? I guess thats why they call it Sin City." Alan Garner~"I play the drums, I'm good as hell" Richie Rich
Chris08527 is offline   Reply With Quote
Old 04-14-2006, 05:00 PM   #141
Tech Champion
 
John Tag's Avatar
 
Join Date: May 2004
Location: Huntersville, NC
Posts: 8,925
Trader Rating: 42 (100%+)
Default

.03...
__________________
www.express-motorsports.net for all your motor needs
Multi time National Champions,Reedy Champs,Vegas Champs,Birds, Champs,[email protected]

Team Associated-Express Motorsports-Trinity-Reflex Racing-A Main Hobbies-ProtekRC
John Tag is offline   Reply With Quote
Old 04-14-2006, 10:11 PM   #142
Tech Master
 
Kenneth Tan's Avatar
 
Join Date: Aug 2001
Location: Singapore
Posts: 1,123
Trader Rating: 1 (100%+)
Default

Hi, If i have fairly new GP4300 packs, probably 3-4 cycles, and I tray them to near 0V per cell before charging, how much mAh would I be able to get into them when they peak? 4500? 4600?I used to charge to about 4000 for GP3700s, when they were new.
Kenneth Tan is offline   Reply With Quote
Old 04-15-2006, 02:58 AM   #143
Tech Master
 
John Doucakis's Avatar
 
Join Date: Mar 2003
Location: Athens, Greece
Posts: 1,108
Trader Rating: 1 (100%+)
Default

You should not discharge below 0.90v per cell.
It hurts the new GP4300.
John Doucakis is offline   Reply With Quote
Old 04-15-2006, 02:33 PM   #144
Company Representative
 
Danny/SMC's Avatar
 
Join Date: Oct 2001
Location: Elkton, VA
Posts: 3,097
Trader Rating: 2 (100%+)
Default

As the battery wars are going on with some claiming that certain cells are better because a racer wins a race with them made me want to post some info to help educate the racer who actually has to pay for his packs.


At a recent race I attended I purchased a Peak GP4300 pack. I built this pack and cycled it to see what the GP4300s looked like. I also built an IB4200 pack which will allow me to compare it to the GP pack.

Both packs are 4 cell packs and were cycled on a GFX using 6 amp charge with a .02 peak detect, 120 delay , 6 amp .01 repeak. Each pack was built using our low resistance Intellect bars and were cycled 3 times before the cycle posted below.

The GP4300 was discharged at 30 amps as this is the amp rate used by Peak. The IB4200 was discharged at 35 amps as this is the rate we use at SMC.

GP4300 sticker number total: 533 - 4.848 - 7.6

Cycle numbers: 492 - 4.79 - 9.0

IB4200 sticker number total: 436 - 4.859 - 6.7

Cycle numbers: 434 - 4.84 - 7.2



As my tests show the voltage and IR of the IB4200 is better at 35 amps then the GP4300 pack at 30 amps. Next cycle I will do the GP4300 at 35 amps and the IB4200 at 30 amps and will post the results.
Danny/SMC is offline   Reply With Quote
Old 04-15-2006, 04:23 PM   #145
Tech Apprentice
 
Join Date: May 2005
Location: Schiedam/Netherlands
Posts: 80
Default

why do you cycle the packs ?
Frans H is offline   Reply With Quote
Old 04-15-2006, 10:28 PM   #146
Tech Fanatic
 
Join Date: Apr 2002
Posts: 793
Default

burito- finally someone has said it. These guys should be wearing cheerleader skirts with sweaters with a big O on them. Rah! Rah! Goooooooo GP. Shake those pompoms!
FranknFurter-it's all over. Your message is a failure. You're lifestyle's too extreme.
(I hope someone got that)
Jack Rimer is offline   Reply With Quote
Old 04-16-2006, 04:55 AM   #147
Tech Apprentice
 
Frank N. Furter's Avatar
 
Join Date: Feb 2006
Posts: 93
Default

Jack - So, are you the new commander?
Yes, I did notice that IB's venting question was ducked!
I know of too many of them going pop, one on the first charge even with the correct fall-back! I know where I won't be spending my money.

Danny - as a paying racer it is not only what the cells say on the label (I am educated enough to know the differences and that some are a bit 'generous') but how long their useful life is. In other words are they still going to be producing the goods in a month or two ot threes time! As you are firmly in bed with IB, it looks like I won't be buying any more SMC packs in the near future.
Frank N. Furter is offline   Reply With Quote
Old 04-16-2006, 05:13 AM   #148
Tech Master
 
Kenneth Tan's Avatar
 
Join Date: Aug 2001
Location: Singapore
Posts: 1,123
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by John Doucakis
You should not discharge below 0.90v per cell.
It hurts the new GP4300.
Thanks for the tip.
Kenneth Tan is offline   Reply With Quote
Old 04-16-2006, 05:15 AM   #149
Tech Adept
 
Join Date: Jun 2005
Location: Latvia
Posts: 130
Default

So far, i have used only GP, ok, maybe they are bit slower out of corners, but life time is most important for me, not the small difference in speed. I havnt had problems with any of my GP packs, but have seen guys having troubles with there IB's....
I also have heard that latest batch of IB's dont have so much of those problems any more, but unless there is at least small possibility that my 70eur pack gonna go bad after few weeks, ill better stick with GP's even they are bit slower...
JanisK is offline   Reply With Quote
Old 04-16-2006, 07:08 AM   #150
Tech Fanatic
 
Join Date: Apr 2002
Posts: 793
Default

I see the current ploy here. You can no longer argue that the IB cell is not competitive (as it has won every major race in the US for the last 6 months) so you will create doubt about the longevity. I will address the venting....if you have a cell that vents, we will replace it. It's that simple. With that said, venting is very rare and certainly not unique to IB. With regard to longevity, it is our experience that these cells last as long as anything on the market. Don't compromise performance because someone tells you the cell is unstable. If you have a reputable matcher willing to stand behind their product, what have you got to lose?
Jack Rimer is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Novak 4300 vs Orion 10.5 Slippery Dan Electric On-Road 1 10-01-2007 11:58 PM
WANTED-MATCHED 4200/4300 cells. J.M. Australia Wanted to Buy 1 05-21-2007 02:11 AM
Intellect 4200's or GP 4300 cells? J.M. Australian Racing 2 03-29-2007 05:13 AM
Much More ForceMax 4300 Zap/Match Cells need4speed Electric On-Road 0 10-03-2006 03:43 AM
Force Max 4300 cells Rod M Electric On-Road 1 04-22-2006 07:16 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 11:38 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net