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Old 09-09-2008, 02:53 PM   #1
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Default 19T Gearing

What is a good starting point for gearing on my B4 with a Reedy 19T Quad Mag Spec Motor. It is on an outdoor track, the straightaways aren't very long. I am running a 2s 25c 4000mah lipo and an 81T spur gear. thanks in advance for the help!
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Old 09-09-2008, 03:17 PM   #2
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Start at a 19.
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Old 09-09-2008, 04:04 PM   #3
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Be sure to watch your run times...that brushed motor will burn the brushes after 6-8 min of that lipo...
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Old 09-09-2008, 04:29 PM   #4
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Quote:
Originally Posted by MikeGonzo View Post
Be sure to watch your run times...that brushed motor will burn the brushes after 6-8 min of that lipo...
OK, this is a big race anyway so I will be changing the brushes every heat. So would a 19 tooth pinion be a good starting point then?
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Old 09-09-2008, 07:14 PM   #5
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For the most power and if you are going to be changing the brushes after every run try using trinity F brushes.
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Old 09-09-2008, 07:35 PM   #6
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OK, Right now I am using Reedy 676 brushes and I also have some Putnam Greens.
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Old 09-10-2008, 01:21 AM   #7
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Slightly off topic but with my b4 im running the checkpoint 19T money motor, these motors are awesome btw and need to be geared alot taller, i've got a 24 pinion with stock spur, and it still has awesome torque like it was undergeared by a few teeth, motor comes off at 160* as well with 4600 ener-G cells.
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Old 09-10-2008, 08:02 AM   #8
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For a truck (bigger tires) I'd agree with tubaboy, but not in a buggy.

I run a quad mag in my B4 geared 23T or 24T pinion on the stock spur, same as we run on XXX's. Our track is medium sized with several tight sections and a long straight. With the 23T pinion I get good response in the tight sections but top out early on the 180 ft straight. Any lower gearing is a waste of the massive wide torque curve on this motor.

BTW I use Reedy 767 brushes for off-road, 769 for carpet in the Quad Mag. The 767 brushes will easily last for 3-4 races if you clean the motor between rounds.
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Old 09-10-2008, 03:24 PM   #9
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For a truck (bigger tires) I'd agree with tubaboy, but not in a buggy.

I run a quad mag in my B4 geared 23T or 24T pinion on the stock spur, same as we run on XXX's. Our track is medium sized with several tight sections and a long straight. With the 23T pinion I get good response in the tight sections but top out early on the 180 ft straight. Any lower gearing is a waste of the massive wide torque curve on this motor.

BTW I use Reedy 767 brushes for off-road, 769 for carpet in the Quad Mag. The 767 brushes will easily last for 3-4 races if you clean the motor between rounds.
Thanks a bunch, I think I'll get a 23T pinion then because the staraightaway is shorter than 180ft.
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