Hi James I do not run LRP but use a Speed Passion V3 6.5 and was running a 23T pinion to a 87T spur on a medium track at the weekend with no issues. I have also ran a 5.5 on a 22T pinion without any overheat problems. I run a HW 120A with the latest software and have left the turbo on and it works fine. I would suggest that you go over the whole car and make sure there is no friction. I have found that the gear boxes do not hold the pinion gear bearing very tight and it can wobble around and cause alot of friction which you can feel as heat on the output drives of the front and rear gearboxes. I also found that my battery strap bulkhead was touching the slipper nut and getting very hot and this helped get to where I am now running nice and cool.
HTH
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