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hmm, what is your LVC set at?
I am wondering if under load the batteries are dropping below the cutoff voltage. |
Originally Posted by Cain
(Post 14005505)
hmm, what is your LVC set at?
I am wondering if under load the batteries are dit was opping below the cutoff voltage. |
hmm, looking at your post you say the ran fine for X amount of time then slowed.
when you charged them from that state, how much did they take in for mah? |
Originally Posted by air8
(Post 14005416)
TROUBLESHOOT HELP:
I bought a buggy from a buddy with the RX8 and Tekin 1900kv motor. The car hasn't been used for 7 months now and it was a super dialed car all season. Anyway, I test ran the car but it slowed after a few minutes. Figured my battery had not gotten a complete charge. Charged it up and verified all 4 cells were balanced, and they were. They were only .009 volts difference. Tried again with same result. So on to elimination: Factory reset & recalibrated radio. Changed sensor wire. Recal the radio. Swapped motor for my Tekin 1900. Recal the radio Swapped my older RX8 in. Recal the radio. Factory reset on my RX8 & recal the radio. I have not tried different brand of batteries. Mine might be bad from sitting for two years. But they seem fine according to the Hyperion 0615i charger. I charged up two 4s starter box batteries that sat for 3 seasons and they held a near perfect balance also just like the 4s I'm using for this E-buggy. So with all that in mind. What should I troubleshoot next? |
Originally Posted by air8
(Post 14005548)
I believe default LVC is NONE. I did set it to the 12v or 12.8 whichever it is under the assumption it was possibly the ESC was thinking I had a lower cell battery.
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I didn't realize this was the Gen2 thread.
When I get the battery on the charger all 4 cells show within .001 volts of each other. After a few minutes of charge they are within .008 volts. So they are showing near same voltage for all cells. The batteries are only taking between 450-1,100 mah each time I charge. I just tried a discharge-charge cycle. Discharged at 5 amps and charged at 10 amps. Same results. Drives like a bat out of hell for 3 minutes then slows down to about half speed at full throttle. At the end of the week I have a friend who I will borrow a couple batteries from to test. It's gotta be a bad cell. |
Originally Posted by air8
(Post 14005548)
I believe default LVC is NONE. I did set it to the 12v or 12.8 whichever it is under the assumption it was possibly the ESC was thinking I had a lower cell battery.
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Originally Posted by air8
(Post 14005703)
I didn't realize this was the Gen2 thread.
When I get the battery on the charger all 4 cells show within .001 volts of each other. After a few minutes of charge they are within .008 volts. So they are showing near same voltage for all cells. The batteries are only taking between 450-1,100 mah each time I charge. I just tried a discharge-charge cycle. Discharged at 5 amps and charged at 10 amps. Same results. Drives like a bat out of hell for 3 minutes then slows down to about half speed at full throttle. At the end of the week I have a friend who I will borrow a couple batteries from to test. It's gotta be a bad cell. The guys are all correct though, clear your data logger memory and then go run the car. You'll see the battery voltage drop below LVC if it's a bad pack. |
Yea Randy, I checked quite often during the discharge cycle. There was a larger spread than I expected at .120 difference with cell 3 being the lowest and cell 4 the highest. Average difference of .096 volts.
I'm not sure if 5 amps is a heavy enough draw to really load the battery. I assume the vehicle load is much higher. So those differences are probably higher at higher loads. Thanx for the discussion guys. I will see what I can find out. |
5 amp discharge will not find a dead cell, 20-30 amp load is what you need to see which cell drops off. I charger 4010 or power lab 6 or 8 will be able to do that. 1/8e pulls some serious amps and can quickly get to the backside of a bad cell in a pack.
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Hello all!
Just picked up a d413 4wd buggy. I have an rx8 gen 2 hanging around and was thinking about putting it in with either a novak 8.5 or with the 4600 kv 4 pole tekin motor. Thoughts/advice? |
Chassis balance would be way off with a 1/8 esc. You would be better off with a pro2 or regular low turn 2 pole motor in a 1/10 buggy instead of a 4x sct motor.
The pro4 and rx8 will work, it just will not be a good setup for that car. |
wonder if you could take off the fan and fan shroud. ESC probably could potentially handle the load with a standard 1/10 motor.
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There is a huge weight difference and I'm not sure chopping the top off will do much (76g/42g)
It will handle anything short of a 1/5 motor but you'd have to add a ton of lead tape to the opposite side to balance the chassis out and then you'd have a heavy pig that over powers the suspension and forget about copying someone's tune. You'd definitely have the power to overcome the weight but it would drive like a pig. That being said, if you can fit it under the body without hacking up a $200 esc and you have it in your pit box... won't hurt to try ;) |
Originally Posted by claytrackstar
(Post 14008029)
Hello all!
Just picked up a d413 4wd buggy. I have an rx8 gen 2 hanging around and was thinking about putting it in with either a novak 8.5 or with the 4600 kv 4 pole tekin motor. Thoughts/advice? |
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