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Tekin Rx8 Gen3 Thread

Old 05-03-2019, 08:02 AM
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Tekin won't add autodetect because a dead 4s lipo (12-13V volts) looks alike a charged 3s pack (12.6 volts). That's just a liability they don't want to accept. The overlap is even worse with 5 and 6s packs. Auto voltage is definitely convenient for free running with various packs, but since Tekin's target market is racing, the vehicle it is in will rarely see a different voltage. Even then, you can change the voltage cutoff with the buttons right on the esc very quickly.
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Old 05-03-2019, 08:21 AM
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The KV limitations are for specific motor sizes. If you are running a short course size motor, you can definitely run a higher KV rating than a Truggy/8th scale size motor. Used to be easy to say "9 turn motor limit" when RC motors were all the same size. Now they are all over the place and their current demands are as well. Just a KV doesn't tell you the whole story about the esc being capable of handling it.
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Old 05-03-2019, 10:12 AM
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I had an issue with my esc this week. After hard breaking it would be dead for a split second. It wouldn't give me throttle till I was at half or more making it extremely hard to drive. Has any of you ever experience this?
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Old 05-03-2019, 08:19 PM
  #304  
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Originally Posted by Big Will
I had an issue with my esc this week. After hard breaking it would be dead for a split second. It wouldn't give me throttle till I was at half or more making it extremely hard to drive. Has any of you ever experience this?
i had a simler issue were i lost 2 wires on my sencor wire. it was a real head tuner. pulled it off the track looked close. and sure enoff.
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Old 05-05-2019, 09:40 AM
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Originally Posted by Big Will
I had an issue with my esc this week. After hard breaking it would be dead for a split second. It wouldn't give me throttle till I was at half or more making it extremely hard to drive. Has any of you ever experience this?
Check your sensor harness first to assure the sensors are reporting back to the ESC. What radio system?
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Old 05-07-2019, 06:42 AM
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Originally Posted by Randy_Pike
Check your sensor harness first to assure the sensors are reporting back to the ESC. What radio system?
MT-44
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Old 05-07-2019, 06:43 AM
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I friend that works in the hobby shop here said to check the sensor wire as well. I'm going to do that and put it on Hotwire. I just dont know what to be looking for.
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Old 05-12-2019, 06:04 PM
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I was having a hard time programming an RX8 G3 with an older hot wire. Then I got the 3.0 and problem solved. I didn't want to get the 3.0, but now I am so glad I did as it can eliminate some travel gear now.
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Old 05-13-2019, 05:42 AM
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no problem here with an original hotwire.
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Old 06-23-2019, 01:58 PM
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What the max temp that the 1900kv T8 V3 4030 (buggy) motor should get? The weather temps are going up right now and I noticed my motor coming off the track at 74°C (165°F) after a 12 minute main.
I'm running an MBX8 with 16/46 gearing. 1 month ago I was able to do practice sessions about 15min and the motor never exceeded 63°C (145°F), but the outside temps went up by 15°C now.

I'm wondering if this still safe for my motor or should I change something? The temp was meassured with an IR temp meter on the outside of the motor can.
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Old 06-24-2019, 06:51 AM
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Originally Posted by morgoth
What the max temp that the 1900kv T8 V3 4030 (buggy) motor should get? The weather temps are going up right now and I noticed my motor coming off the track at 74°C (165°F) after a 12 minute main.
I'm running an MBX8 with 16/46 gearing. 1 month ago I was able to do practice sessions about 15min and the motor never exceeded 63°C (145°F), but the outside temps went up by 15°C now.

I'm wondering if this still safe for my motor or should I change something? The temp was meassured with an IR temp meter on the outside of the motor can.
Nothing wrong with 74°C after 12 minutes. The motor is good to around 100°C without any risk of damage. As long as I'm under 80°C after a hard race, I don't worry about it. The motor temps will increase fairly linearly with outside temps; if it goes up another 15°C, so will the motor.
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Old 06-24-2019, 07:03 AM
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Originally Posted by Krio
Nothing wrong with 74°C after 12 minutes. The motor is good to around 100°C without any risk of damage. As long as I'm under 80°C after a hard race, I don't worry about it. The motor temps will increase fairly linearly with outside temps; if it goes up another 15°C, so will the motor.
Do you mean 100°C measured on the outside of the can? Or 100°C on the motor in the data logging?
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Old 06-24-2019, 08:33 AM
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Originally Posted by morgoth
Do you mean 100°C measured on the outside of the can? Or 100°C on the motor in the data logging?
100°C on the outside of the can. Take several measurements from one end of the motor to the other and go with the hottest temp you see. The data logging should roughly match the can, but its only taking the temp at one end of the motor and the circuit board it is on can insulate it a bit from quick temperature changes in the windings. Check the data logging graph to see if the motor temp levels off after 5-8 minutes or if it keeps climbing the entire run. That's more what I like to use the data logging for. You should see the temps quickly climb the first 2-4 minutes, start to level off between 3 and 8 minutes, and then stay fairly constant the rest of the run.

Tekin has stated in the past that the T8 motors can withstand occasionally hitting 115°C (240°F), so making sure the can doesn't exceed 100°C leaves room for temperature variation within the motor.
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Old 06-24-2019, 11:16 AM
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Originally Posted by Krio
100°C on the outside of the can. Take several measurements from one end of the motor to the other and go with the hottest temp you see. The data logging should roughly match the can, but its only taking the temp at one end of the motor and the circuit board it is on can insulate it a bit from quick temperature changes in the windings. Check the data logging graph to see if the motor temp levels off after 5-8 minutes or if it keeps climbing the entire run. That's more what I like to use the data logging for. You should see the temps quickly climb the first 2-4 minutes, start to level off between 3 and 8 minutes, and then stay fairly constant the rest of the run.

Tekin has stated in the past that the T8 motors can withstand occasionally hitting 115°C (240°F), so making sure the can doesn't exceed 100°C leaves room for temperature variation within the motor.
I didn't know this. My motor never saw anything above 74°C. But I was a little concerned because I only drive 10 mins practice heats on hot days. Next weekend there is the nationals and they predicts temps up to 36°C in the afternoon, so I'm guessing my motor will be close to 80°C after a 10min main. I don't think I will ever hit 100°C.
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Old 07-24-2019, 05:18 PM
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So after about a year with my RX8 GEN3 and T8 G3, it started running in reverse one day. Radio settings have not changed whatsoever. Motor wiring has not changed. Any ideas?

I bet I put the diffs in backwards. Wow. I need a beer!!
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Last edited by savage24x; 07-24-2019 at 05:45 PM.
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