Originally Posted by Mabuchi540
Yeah it is a 4wd TC with a rollout of 45.126mm. I was hoping that as a starting point I would try that number on my 1/12th but if as you say the lower voltage of the battery (yes it is 4 cells x 3700mah) will not be countered by the lower weight of the car.
Then I just guess I'll have to take a stab at a suitable rollout. Somewhere on these forums someone suggested a 38/100 spur combo but that would give a rollout of 59.6 which seems rather high for a 540 considering the hightest I've run was 50.8 at the nationals and that was rather hot lol.
Let me offer something from my experience. When you get the 1/12 scale car fully competitive and efficient, your fast lap should be around .3 seconds faster than the touring car. I suggest pinion/spur combinations of 28/100 to 31/100 if the straight is between 70 to 90 feet long. This is using the Trinity stock motor based as the Monster Horsepower motor. The Epic Stock 27T motor is about 2-3 pinion teeth lower than the MH. The Trinity P2K2 is maybe 1-2 pinion teeth higher than the MH. I don't know what you mean by the Mabuchi540, but if it is different than the ROAR 27 turn stock motors I mentioned about, then there will be some deviation to this info. What is the spec to the Mabuchi540 so I can iterate this information. Hope this helps.