you've done a factory reset on the ESC but have you relinked your radio with the ESC?

After a factory reset the ESC is totally "reset" which includes your radio calibration settings. Simply re-calibrating the ESC should correct that issue.

I'll try that. I thought the esc had to find neutral before I could attempt to calibrate.

I'm running a 4700kv hobbywing motor and a radiopost green servo on a 2s battery,Can I set the bec voltage to 7.4 or should I leave it a 6?

That's dependent on your servo. If the servo can run HV, I would suggest it.

That worked. Thanks Randy. I guess the low neutral only matters if you get it in calibration mode. My bad.

Premature LVC on RX8 Gen2
 

I have noticed that my RX8 prematurely drops into LVC during races; sometimes causing me to fall out of a decent place (I'm not that good so when I'm doing well, tech problems particularly annoy me.)

Thinking that there might be a problem with one of my settings, I updated to the latest firmware and restored to factory settings; same thing. I have noticed that it is better with certain batteries than others. I also check my batteries after each run and the batteries are never below 7.2 volts. Also, the issue does not present itself on my other RC vehicles.

I spoke with Tekin and they recommended that I check the data logs after each run, which I will do tomorrow night.

Does anybody have a reason for this behavior?

If your LVC is set at 3.5v per cell or higher, it's possible that the voltage drop from full throttle passes decrease the voltage momentarily below the cutoff and causing a premature shutoff. It would also explain why certain batteries work better if they are higher MAH packs that might drop voltage later in the run. That's just an idea.

Thank you for the idea but the cell cut off is set at the default value of 3.2v

Hmm that stinks but the Tekin reps usually come around the forum pretty often so I'm sure you'll get some clarity soon enough if not from someone else.

I spoke with Tekin (Jeremy, I believe) who was very helpful. Unfortunately more information is needed so I need to reset my data logs before each race and check them after each race to see if there is any voltage drop during the races.

What batteries are you using exactly? If some have more mah than others this would make perfect sense.

3.5v per cell is fine for a shorter run, say 6 minutes. But if you're trying to get say 8 minutes on a 6000mah battery you're likely hitting LVC at the 7 to 8 minute mark softly, and completely passed that time.

I have two sets of batteries that I run; SMC 6500 mAH, 60C and a GensAce 7200 mAH, 70C. I never have an issue with the GensAce battery but the SMC batteries seem to drop about 5 minutes into a race.

I don't know if I mentioned this earlier but the motor attached to the ESC is a Hobbywing 4000kv sensored motor.

Looking at the data logs from HotWire, it does not appear to have much of a voltage drop during the races. I did not see anything lower than 7.1 volts.

I gave my son the suspect batteries to use in his Slash 4x4 with an older 2-pole Velinion and he had no issues. I realize that the Traxxas product pulls nowhere near the current that the Tekin does but it is a comparison. My Slash 4x4 has a Castle MMP and 3800 kv setup and the batteries seem fine in that too.

I will see if I can try the suspect batteries in somebody's truck at the track today to see if a Hobbywing setup results in a similar problem.

Thanks for the feedback everyone. It was my SMC batteries. I really pushed the truck hard yesterday and it worked fine with the GensAce 7200 battery. The SMC batteries did not provide the same level of performance. Plus after pulling the truck off of the track, the SMC batteries were not balanced at all.

Great job, the data loggers don't lie ;)