Tamiya Transpeed Motor

[Old-School 0]

I recently brought a tamiya transpeed motor for my F103GT and noticed that you can rotate the end bell for different adjustment settings. The infomation given with the motor only tells you what the standard setting is(third notch in from the right). Can anyone tell me what the other setting will do to the performance of the motor.

[B.M.T. 127]

Well, when it comes to timing adjustment, it's just like distributor timing in a "real" car. How far you advance the timing (twisting the endbell into or towards the direction of rotation will increase power and RPM, at the cost of economy. Advance it too far, and you loose too much bottom end torque.

In direct opposite, if you retard the timing by winding the endbell with the direction of rotation, you get sluggish performance and way too much current draw.

[94eg! 839]

BTW: All the notches past the zero mark are for running the motor in the opposite direction. Don't bother with them...

It's probably best to keep the timing where it was set from the factory. It's typically set to run the motor with a good balance of performance and efficiency...

[Old-School 0]

Thanks for your reponse. I will try some different setting this weekend, and see how fast i can get this car going.

[terry.sc 19]

Adjusting the motor timing affects the motors performance and usually comes ready tuned to the best setting.

Due to the way motors work (dragging a big lump of steel through a magnetic field) the best performance isn't when the brush timing is set at zero as the magnetic field is twisted by the effects of the armature spinning. To balance this out the brush timing is advanced slightly by twisting the endbell.

Increasing the advance gives you more performance with less efficiency. With low timing advance as the coils on the armature are being charged in the centre of the magnetic field the motor produces more torque and operates more efficiently so it draws less current. As the timing is increased the charging of the coils on the armature moves out of the centre of the magnetic field, so it produces less torque, but also lets the motor rev higher for more speed. The motor operates less efficiently so the current draw goes up. Once you have gone past the sweet spot any higher timing advance just gives even less torque and huge current draw with no difference to top speed. Increasing the timing usually means you have to change the gear ratio to match, some motors I use work best with very low advance and a higher gear ratio to get the speed back, while others run best with higher advance and the gearing lowered to deal with the reduced torque.

Usually to find the best setting you either need a motor dyno to test it and measure speed and current draw, or lots of tweaking and testing on the track. You usually end up with a setting not far off the manufacturers setting.

[Old-School 0]

I've been looking for any info on how many RPM does the Transpeed(10t) do, and can't seem to find the specs on this motor anywhere. Can anyone help with the RPM's of this motor. I am looking to upgrade to a brushless motor and don't won't buy a motor that go slower.