20LikesOfficial Tekin RX8 GEN2 ESC Thread
05-12-2015, 01:58 PM
#2779
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?
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?
05-12-2015, 02:59 PM
#2781
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.
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.
05-12-2015, 04:16 PM
#2782
05-12-2015, 04:18 PM
#2783
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.
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.
05-12-2015, 08:41 PM
#2784
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.
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.
05-13-2015, 05:40 AM
#2785
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.
05-13-2015, 10:40 PM
#2786
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?
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?
05-14-2015, 08:46 AM
#2789
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
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
05-14-2015, 09:17 AM
#2790
I'm sure it can be done. But as the others mentioned it will throw off the left to right weight most likely unless you go Pro2 which may help.