Jimmy Fukuyama

That should be fine.

Jimmy

teamAE

Ok thanks

Jimmy Fukuyama

Ok, I mistaken what you said. You should charge it and race. Then after the heat/race, let it rest or cool down for at least 1 1/2 hours. Then repeak it back up to .05 or .48mv depending on your charger and the temp should be around 145f~155f. Then after the second heat/race, discharge it down to 5.40v for 6 cell pack or 3.60v for a 4 cell pack and let it rest. I don't believe that you need to recharge it back up even if you're planning to store it for 5 days. If you plan on storing more than 5 days, you might want to charge it up the day before the race and discharge it a couple of hours later so to make sure it's taking charge ok and there is no false peak. Then on race day, charge it up like normal and win races...

Jimmy

holycow

What the?

Didn't I just order these cells yesterday? AWESOME!
I gota say.. i am VERY impressed with the #s shipped... I can't wait to try them!!

Intermision

I don't like reading the whole thread so I will ask.Where is their website?

holycow

http://www.fukuyamaracing.com

mike_Webb

Holycow your batteries are not in your car correctly!!!!!

holycow

aahh oh no!!!

nah.. i just slid them in there for the shot

RBLove

iTrader: (90)

Recommendations: Below are the methods I use to charge and discharge. Boviously with my Fukuyama Racing packs...

Before the first charge of my race day I will put the pack in an equalization tray. I only do this one time per race day before the first charge.

I charge at 6 amps with a .04 cut off. I attempt to have the charge complete right before racing. Usually never happens (too late or too early). So I repeak the pack "1" time at the same charge rate and cut off.

After the run I discharge the pack at 30 amps to 5.40 for 6 cell or 3.60 for 4 cell.

I let the battery rest for a couple of hours. Let them temp come down and get a good rest.

I try to practice one time each with my batteries and then race and qualify with them. Second run on the Fuku packs is AMAZING.

Second run I charge the pack the same way, but do "NOT" tray the pack. Once the run is over I discharge at 30 amps to 5.40 or 3.60 and let the battery sit until the next race day.


I have found no ill effect letting a battery sit at a discharge of 5.40 or 3.60 for a few week time period. Seems to be no advantage in storing the battery with a charge "UNLESS" you are talking months.


For mod racing:
I like to run the pack one time per race day and charge at 5 amps instead of 6. Provides great run time and still gives the punch needed. If chosen to run a second time in the day the run time drops slightly, but voltage goes up and ir's go down. This is why I HIGHLY recommend two runs for stock and only 1 for mod if run time is an issue.


All of my charging is done on a CE GFX.

Hope I didn't ramble on to much and you find the information to be beneficial. You may already have a system that works for you and that is great, but if you are looking for a method or need some advice try the above. Feel free to PM me or e-mail me at [email protected] with any questions you might have or post them here. I am here to provide support to the Fukuyama Racing customers.


WWW.FUKUYAMARACING.COM for all your voltage needs

holycow

Anybody know of a conversion equasion to figure out what a cell would be rated at if discharged at 30 amps, if you only have the 20 amp numbers? 1.23 at 20amps, is what at 30amps?

RBLove

iTrader: (90)

You really cannot convert. The battery is going to give a much different effect at 20 opposed to 30.

Used to be said that:
1.17 @30 is a 1.19 @ 25 and a 1.21 @ 20. 2 point difference. I do not believe this to be true. If you have some cells that are matched at 20 amps and want to know their output at 30. You could cycle them on a Turbo 30/35/GFX or send to a matcher to have batteries rematched at 30.

John Fontaine

iTrader: (2)

Rob, great charging instructions. Do you happen to use the long lockout mode of 600 seconds when charging for the first time after traying the cells to lockout false peaks during the first 10 minutes of the charge?

John

Maj. Teeth

John Fontaine

iTrader: (2)

Good information Daniel.

dpaton

Dan-
I'l be ordering cells soon, I promise. Hopefully before the end of the month so I can get in on that free shipping goodness

As someone coming from the other end (charging and power managemnt) I'd love to talk shop over lunch with you if I'm ever in SoCal again. Any thoughts on the higher than ideal charge rates (5-6A, vs 3.75-4A) in regard to capacity training and self-heating? Or is that too close to the secret sauce

Feel free to start another thread if you think I'm getting too techie for the general Fuku batt. one.

-dave