Originally Posted by
ta_man
Aside from Randy's suggestion about tip size, you should also make sure you are using sufficient flux. I use a weller 4033s which is just a simple iron, not a fancy soldering station. It has a big chisel tip and an 1100 deg operating temperature. Some may say this is too hot, but with proper preparation and use of flux I can solder a Tekin RX-8 terminal in about a second. No matter how hot the iron is, you only have to get the joint hot enough to flow the solder, so the faster you can transfer heat into the joint you are making, the less time that heat has to get to other parts of the electronics you are working on. This is what the joints look like (no excess solder and a perfect fit of the wire in the slot of the post):
What he said. The high temp is fine and will actually work better when using the proper tip and flux. Shouldn't take more than 2 seconds to solder the joint and there is no risk of getting the ESC board hot.
Originally Posted by
akshayp14
i used the car again today and geared down, seems like the motor has burnt out, motor temps were like 122 C after 2/3 laps, and there would be a sudden loss of power from half way into the throttle, on top of this the motor seemed to cog quite bad.
and after the 2/3 laps the esc went into thermal shutoff (first time I've EVER thermal-ed an rx8), temps were like 105 C.
just want to know how i go about diagnosing the problem?
This sounds like you have bad solder joints causing increased resistance. I would re-solder your wires and see if it drops your temps. Could also be a problem with the internal resistance in your battery pack. Check the cell balance and resistance of each cell as well as overall resistance. Eliminate those issues first and if it doesn't correct the problem then start looking at the ESC and motor.