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Old 08-17-2011, 05:14 AM   #16
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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
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Old 08-17-2011, 06:22 PM   #17
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Actually I was very happy with 64p on my car.

However, I guess I should have tried 48p while I practice at parking lot.

Thank you very much for your information. I learnt.

BTW, what is endbell timing?
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Old 08-18-2011, 12:30 AM   #18
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Depending on motor, you can turn the endbell (after unscrewing it) to more or less timing, some have 3 positions (following the A,B,C of wires), some have little lines marked on top and some like LRP use different inserts where the sensor cable plugs in.
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Old 08-18-2011, 12:48 AM   #19
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Set your mesh, than rotate your spur 90 degrees or so, check again & reset if needed. Repeat a few times. Spurs are not always perfectly round so if you have your mesh set right at one point, there might be a gap that is too large in another location which can cause your pinion to strip the spur gears.
I had an out of round spur that did not become apparent until i changed from 24T to 32T pinion, i could not get and even mesh and in haste got it as good as i could and after a few laps chewed the spur to pieces, new spur was much more round and i never had that trouble since.
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Old 08-18-2011, 10:26 AM   #20
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Haha.. now it reminds me the oldschool brushed motor with endbell timing....

However, I don't use any of the BL motor with endbell timing yet.
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Old 08-19-2011, 01:54 PM   #21
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Haha.. now it reminds me the oldschool brushed motor with endbell timing....

However, I don't use any of the BL motor with endbell timing yet.
They are the same, only different
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