need help with converting a hyper 7

[lincpimp]

Originally Posted by whitrzac

what do you guys think about using the savage flux battery boxes?

They are designed to stand up, something like the novak trays are a better idea. A high profile box will not fit under a stock buggy body. Not much room under there.

[whitrzac]

Originally Posted by lincpimp

They are designed to stand up, something like the novak trays are a better idea. A high profile box will not fit under a stock buggy body. Not much room under there.

ok, just bouncin ideas around...


so what gearing should I start off with? I realy don't want to spend $50 on pinions...

I have a 46t spur

[lincpimp]

Use BrianG's speed calc.

http://scriptasylum.com/rc_speed/_top_speed.html

Your results should look something like this:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 9
Total Voltage: 14.8
Motor KV: 5000
Tire Diameter (inches): 4
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 5.11 : 1
Total Ratio: 16.90598 : 1
Tire Circumference (inches): 12.57 inches (319.19 mm)
Total Motor Speed: 74000 RPM
Vehicle Speed: 52.09 mph (83.67 km/h)

An 8 tooth pinion looks like the best bet, however you may have some issues getting it to fit physically. Smaller pinions usually cause problems, as the motor can only get so close to the spur before it contacts with the diff output. The smallest hardened pinion Mike carries is a 9 tooth. I would give that a try... I usually try to gear for around 45mph, the 9 tooth will give around 50mph with that motor.

[lincpimp]

Novak also make a 9t pinion that is hardened. If you plan to use a steel spur, stick with Mike's pinions as they are the best hardened pinions I have found...