Originally Posted by
cjtamu
Sensored. LRP SXX TC Spec V1 is what I'm using right now. If I can ever get my Orca MKII TC Spec speedo back it will eventually go back in the truck. Motor and speedo both performed really well, speedo temp was only about 110. Ambient temps here are still mid 80's during the day, so that's all good. Gearing would have been really good on the tighter track we run. But, this track has a long front straight and a double into a table top that I just didn't have enough guts to clear consistently. Not to mention, when the 2nd place car was close early I had to take the preferred line away in the straight. Losi with a 4,000kv Pro 4 motor, and he would pull me 10 to 15 feet on the straight. Had to make sure he was on my outside coming into the corner at the end LOL.
I would make sure the TC Spec was on the lowest timing profile and then wouldn't be afraid to gear it up to a 15 or 16 tooth. I used to run a 5.5 and 4.5 sc4x before the pro4's came out and they usually came off the track just under 170 and were geared as high as 16/62 and 14/62 respectively depending on the track.
Without seeing your track it sounds like you are spending a decent amount of time in the upper rpm range of that 6.5 which is probably where most of your heat is coming from. The safe way to go would be to keep gearing up a tooth at a time until you are coming off between 160 and 170 or you have the power you are looking for. Having said that, if I had a 6.5 sc4x it would probably be geared 16 or 17/62 in my truck.