Originally Posted by ep10
I see. I didn't know that I should use 48p for outside track. As I was told (or taught) that 64p runs more smoothly and gave you more combo choice on the ratio.
Anyway, thanks for the information. I will try it with 48p. Thanks.
You were taught correctly. All of the above is true, to a point. But as you've found out the hard way, 64P gears are delicate, certainly more so than 48P. It's not that you HAVE to use 48P for outside, but with parking lot running, it's a whole different type of asphalt (like the difference between cement and concrete (rock is added)for durability and stability under load. Purpose built RC tracks use only finely grained asphalt), with LOTS of little rocks everywhere. If your outside track were a purpose built, well groomed asphalt track (like my home track), 64P is fine.
No free lunch: Durability or adjustability! Just like a set-up, you have to adjust your hardware to the surface you're running on. In this case, the danger of rocks ruining a race (or a fun day of running) outweighs the benefits of 64P. I'd rather finish a race day one tooth undergeared with 48P(but made up for with endbell timing) than have my day finished for me being perfectly geared with 64P gears that get destroyed during the first qualifier by a random rock.
Which do you spend more time doing, running the car or adjusting your gearing?
Find a ratio in 48P that is about what you'd run in 64P, change over, check temps, and adjust endbell timing to compensate if necessary. Usually it's quite possible get within just a few points of your original ratio. Check the link below, it'll help you out.
Click here for tips on how to do the math to convert from one pitch of gears to another