how fast to be competitive?

[telboy]

To be honest, I'd go for a more common motor like the ones that jimmy mentioned. the tamiya motors are ok, but nothing compared to the mainline 19's etc.

We use to run tamiya 11turns in the eurocup, but compared to an orion or something similar, the tamiya was more like a 15/16turn orion.
Tamiya motors aren't as fast as most other makes. So if its speed you're after then look at others like the orion/peak/reedy makes etc. they're much better.