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Old 10-28-2008, 12:19 PM   #16
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So stay with the 81 and go up on the pinion. If anything go to the 84 if I want alittle more speed out of B4.

No, if you want more torque. The 84 will slow top speed and increase torque. The larger spur also increases torque to the wheels which will create more wheel spin. With a 2WD buggy try to keep the spur as small as possible while maintaining the proper FDR to reduce wheel spin, or loss of traction.
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Old 10-28-2008, 10:23 PM   #17
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No, if you want more torque. The 84 will slow top speed and increase torque. The larger spur also increases torque to the wheels which will create more wheel spin. With a 2WD buggy try to keep the spur as small as possible while maintaining the proper FDR to reduce wheel spin, or loss of traction.
So, the way i'm getting this is keep my B4 at 81 spur and play with the pinion gear. Go from 20 tooth to about 23 tooth pinion. Because, I don't want wheel spin and loss traction and maintain proper FDR.
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Old 10-28-2008, 11:08 PM   #18
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http://spreadsheets.google.com/pub?k...jA7nLsQ7N2eRfg if you are interested in this, feel free to add this live chart to your bookmarks.. if your car is not up there, it will be eventually.. thanks!
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Old 10-29-2008, 12:01 AM   #19
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I use an FDR spreadsheet to work with gear ratios. If anyone wants a copy, pm me your email addy.
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Old 10-29-2008, 01:06 AM   #20
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Thanks, I'm going to use both
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Old 10-29-2008, 06:54 PM   #21
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Going with a 16 pinion is the wrong way. A single wind motor is all torque and needs a taller gear. The 87 is never necessary for the B4, 84 at most. Start with the 81 and a 21 pinion. You should be able to go clear up to a 23 and be just fine in racing conditions.
My bad. somewhere along the way I thought you were running a T4, not a B4. Gearing is definitely higher in the buggy due to the smaller wheels. I run a 23 or 24T pinion with a spec motor in my B4 while truck pinions are always in the teens. Sorry if I mislead you B4wires.

I still stand by my recommendation with single wind motors, they need lower gearing than double winds to make usable low end in my experience.
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Old 10-29-2008, 08:55 PM   #22
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My bad. somewhere along the way I thought you were running a T4, not a B4. Gearing is definitely higher in the buggy due to the smaller wheels. I run a 23 or 24T pinion with a spec motor in my B4 while truck pinions are always in the teens. Sorry if I mislead you B4wires.

I still stand by my recommendation with single wind motors, they need lower gearing than double winds to make usable low end in my experience.
No problem, I can see where you can get confussed because I have a T4 too. It's on my signature. It's still help a helping hand and I appreciate it.
Thanks.
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