Gears

[Timz]

If you lower the number of teeth on a spur gear will the car go faster?

[JoeTheShmoe]

Yes, and if you make the pinon bigger, it will nake the car go faster also..

[Timz]

My bad. If you raise the number of teeth on the spur gear and lower it on the pinion will the car go faster?

[Timz]

I'm mixed up because on my electric stampede I put a bigger spur+smaller pinion on it and it went faster.

[jayskiia]

if you put on a smaller spur like going from a 87t to a 84t it will make the top end speed higher, but the acceleration slower. if you did this and went from a 18t pinion to a 17t pinion it would go against that and give you more acceleration with less top end. keep playing with these combinations to find the perfect balance for your track. also remember the higher your top end is the shorter your run times will be.

[LosiMan3456]

So can anyone just say the rule of thumb. That would be alot easier. So it is just like a motor right. The lower the number the faster but less accel and vice versa for a larger spur gear. It is the exact opposite of a pinion.

[Throtl Hapie]

That's pretty much it.
-Lower spur and lower pinion cancel out.
-Higher spur and higher pinion cancel out.
-Higher spur and lower pinion = low speed, high accel.
-Lower spur and higher pinion = more speed, less accel.

[Nairb]

Well, here's an absolute way to tell what different gears will do. First, divide you current spur gear's number of teeth (87 for me) by the number of teeth on your current pinion (20 for me). 87/20 = 4.35 Then if you want to change to another setup, just divide the new tooth count the same way. If the resulting number is higher than the original (4.35 for me), then it will have faster acceleration and a lower top speed. If the resulting number is lower, the truck will accelerate slower, but have a higher top speed. Let's say I want to try an 84 tooth spur with my 19 tooth pinion. 84/19 = 4.42 This means that I'll get better acceleration, even though I made the spur gear and the pinion smaller. It's all a game of ratios, keep that in mind.

Why would you want to lower the number of teeth on both gears? I guess it could be beneficial, because it would lower the rotating mass, but then you wouldn't have as many choices to fine tune your ratio for track conditions. Those are the ropes...think about it.