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Old 10-17-2007, 06:53 PM   #1
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Default factory team b4 gearing ??

i have a ftb4, amd am using the 81 spur out of the box, and am using a 24 pinion gear, is this about right, what difference will it make going down to a 22 or up to a 26.
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Old 10-17-2007, 06:58 PM   #2
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How many turns is the motor you're using?
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Old 10-17-2007, 07:03 PM   #3
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im using a novak 13.5 brushless with a novak spread spektrum gtb esc
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Old 10-17-2007, 07:17 PM   #4
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Ah, okay. I haven't switched to brushless in my B4 yet, but I can tell you that going down from a 24 to a 22 will give you more punch and less top speed. Going from a 24 to a 26 would have the opposite effect. How does your car feel on the track? It should top out by the time it's 3/4 of the way down the straightaway. If it's still accelerating by the time you reach the end of the straight then I'd increase the pinion size. That's how it would be with a brushed motor, so I'm thinking the effect on a brushless would be the same. I think I remember seeing that you would gear a 13.5 a couple of teeth lower than you would a 27 turn brushed motor, so a 21-22 might be the way to go. Someone please correct me if I'm wrong.
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Old 10-19-2007, 10:10 AM   #5
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Baseline ur gearing at 25 pinion on an 81 spur then move up. Also check temp on ESC after running as well. Most guys I am hearing are running sometime all the way upto a 30 pinion.
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Old 10-21-2007, 07:35 AM   #6
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Quote:
Originally Posted by simba View Post
im using a novak 13.5 brushless with a novak spread spektrum gtb esc
81 SPUR
21 PIN
WORKS GREAT @ MY HOME TRACK
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Old 10-21-2007, 08:55 AM   #7
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With the novak brushless 13.5 in a B4FT with 81 spur we are using a 26 pinion and the buggy is super fast and have not had any temp problems. This in no an inside high bite small track with some big jumps and large straightaways, as well as outside loose clay tracks. Plenty of punch to clear jumps coming out of slow turns and outstanding straightaway speed.
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Old 10-21-2007, 09:01 AM   #8
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I found that with the brushless 13.5 motors they like higher tooth pinions.
For example, I started with 24T and when I went to 26T I noticed more punch and top speed.

It is important to check the motor temperature when you are testing new gearing to make sure that you are not going to burn up the motor.
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