I have a few tanks that I bought used. Our tiger is slower than the pershing and panther. No biggie, but I just built 2 shermans which are not as fast as that Pershing, All 3(us) have stock tamiya motors. The tiger has the black can motors. Turns out that Tiger isn't slow compared to the Shermans its just slow compared to the Pershing.
I know with RC cars a motor needs break in time but the speed is considerably slower. I thought the Shermans would be fast like the pershing. ??????? Anyone else have this experience?

Different Tamiya tanks use different gearboxes and hence different ratio's and speed. The King Tiger is extremely fast out of the box and the sherman is a little slow out of the box.
You usually have to use gear reductions, different motors, or different motor pinions to dial in your speed and still have torque for manuverling on that last hit. Here's a speed chart using a 25 foot course I believe. Throw some tape on yourfloor or driveway and time it at full throttle from tape to tape. (25ft) Make sure to use a fully charged battery and the floor or driveway is level too.

http://www.bayareatankers.org/Intelligence/Article_00/Apndx_b_Rev_b_Ratified03_.htm<br type="_moz" />

Thanks, one would have thought that Tamiya would have taken this into consideration.
I can see it now a platoon of KTs out flanking our mediums.

Everything else being even, remember the drive sprockets of Tigers and King Tigers are also a lot bigger in diameter, so you'll get more movement per RPM of the drive wheel.. shermans are relatively small!

Yeah.... I'm an idiot. I looked closer and the Pershing has promax 400s in it.