Gearbox question.

[DRAGONWAGON]

Hi all,

I'm planning to buy a Impact gearbox with motors for my upcoming Tamiya Tiger I build, But I'm not sure which pinion to use: 8t, 11t or 12t. Which one would you recommend??

http://mitosal.com/Transmission_Unit.htm

Cheers, John.

[buckeye36]

Are you getting them with the drop down gear?

[DRAGONWAGON]

As far as I could see, they are standard with the DDG, or am I mistaken??

[ruben2005]

hello mate the 12 will go slower but more power

[B.A.D.A.S.S.Force]

hello mate the 12 will go slower but more power

Are you absolutely sure about this statement considering just choosing a different pinion gear alone?

I always thought, with keeping the spur gears the same, that changing to a ...
smaller pinion = more torque
bigger pinion = less torque

So a bigger pinion gear, leaving the spur gears the same, should allow a faster top speed, but suffer on its low-end torque, while a smaller pinion should provide better low-end torque, but suffer on its top end speed. So the 12T would provide the least torque but the most top speed among those 3 choices.

Am I the one getting that backwards?

~ Craig ~

[ruben2005]

watch the video on the mitosal the last run of the tank had a impact tu3 with drop down gear and hop up gear set 2 so i thought the 12 t was the last gear to be used

[buckeye36]

No offense, but smaller pinion is more torque...larger more speed.
Check the gear ratio chart at Mitosal and you'll see the same gear set up with the 12 tooth pinion results in a lower ratio--faster.
The video didn't mention a change in pinion gears, just hop ups with standard Tamiya motors and 10 tooth pinion.
http://www.mitosal.com/HopUpGear.htm

[buckeye36]

As far as I could see, they are standard with the DDG, or am I mistaken??

You can order them with or without the DDG, ratios are:
With DDG -- Gear Ratio 105.469
Without DDG -- Gear Ratio 59.765

[ruben2005]

oops i was wrong the 12 is more for battling as its says

[DRAGONWAGON]

Set is in, complete with DDG, 11t pinions and upgraded 480 motors, I guess I'm a sucker for AM.....Just to see the gears, torsion bars, photo etch.....life CAN be good!!

Thanks again for all the replies guys, was very usefull. John.