erock1331

I replaced my GFX leads (alligator clips) with some smaller sized leads.
I noticed that whenever i cycle a 4 cell pack pretty much no matter what my labels read, the pack is always a 4.79.

I started to think about it, and my goofy numbers started with i went to the smaller leads.

Anyone else have this problem ?
I think its because the smaller alligator clips dont disappate the heat as well.

Anyone got a part number of the leads i should use that are similar to the factory clips that come with it ?
Like is there a certain amp rating I should go by ?

Corner Weight

There are two sets of leads - which one did you change? And what are you doing with the other set? Hopefully you are using both sets of leads like CE recommends.

erock1331

i changed the large leads to a smaller medium sized lead.

i use both sets when i cycle

tonight i swapped the medium sizes ones out for the normal larger size clips and cycled a pack, the size of the leads didnt change anything

Kevin K

iTrader: (32)

If you changed the size of the alligator clips that should not effect anything....if you changed the size of the wire LEADS that will effect your numbers. Also as CW said you need to use both sets of alligator clips when you are cycling or discharging a pack....if you dont use the set with the smaller size wire when discharging/cycling you will get wrong readings as far as your voltage and runtime go.

RayWarner

I would suggest you just contact CE directly. These guys are great to deal with. (from the web site) 8:00-4:00 Monday thru Friday central time at 815-874-8001 FAX 815-874-8181 or email [email protected]

erock1331

Yep i used both sets of leads and did not change the wire length. only the size of the clips. you are right it did not change the results.

pretty much everybody is getting 4 cells packs in oval these days at 4.80-4.85 @35 amps. Some even as high as 4.88-4.90 (which I think they are lying)

I just questioned mine cause I keep getting better and better packs on the lables and on the track but seems like they will only go 4.79 on my machine no matter what the battery labels read.

I noticed the 5 second reading on my buddies GFX is always 5.40+
My 5 second reading is always 5.35 or lower
his 15 sec reading is 5.25, mine is always 5.19-5.21 range

He gets store bought packs that go 4.80-4.84 on his machine.
My team stuff is 4.77-4.79 on my machine.

LeadFoot

erock1331

Go to the Competition Electronics Web site and under the GFX download the Extended Users Manual for the charger.

Then get a Serial cable and connect the GFX to a laptop or other PC with a serial port. Follow the instuctions in the Extended Users Manual.

Per the manual setup the GFX to give you readings to the port in 1 sec intervals. Take the data and follow the instructions for making a graph in Microsoft Excel.

My brother and I have been able been get almost to the exact second results between our two chargers with the same battery pack. My understanding from talking to CE this is more accurate than what you see on the display.

Also, the power supply you are connected to and how clean the power that is coming from the power supply will depend on how accurate your results are going to be. When I run my charger at the track I have always recieved different results than when I am home. At home I use a power supply that is designed to clean all the noise coming from the power line. I have a very old pyramid 40Amp regulated and noise filtered power supply at home that is used for Ham Radio equipment and I always get better results at home.

squeege

my leads get so hot during 30 amp discharge that the rubber boots over the large alligater clip on the positive wire starts smoking and melting

davepull

sounds like your machine needs a tune up Eric

HVFracingwilly

iTrader: (17)

Ive also noticed that it matters where the sensing wires are placed i always clip mine between the charging leads and the cell on the battery bar just another thought

tbeardmore

iTrader: (3)

Very Impportant to get accurate numbers

erock1331

That is where i put mine as well.

but the small leads are just for measuring IR right ?
the big clips measure the voltage.

erock1331

dave
what are you seeing for your packs ?

I dont like posting stuff about batts on the other thread because it just becomes a big pissing contest over numbers.
I just wanna see if my machine is reading low or if maybe this is what everybody is really seeing
lol

ICEMAN

iTrader: (1)

i changes all of mine as soon as i got mine , with Gen. Silicone wire, works GREAT

RC Professor

iTrader: (17)

The small leads measure voltage. If you connect only the small leads and leave the large ones off, you will see the voltage of the pack appear on the screen.