to Boost or not to boost motor? (ESC turbo timing)
 

Can ALL brushless (sensored) motor to be boosted(turbo timing)? if it doesnt have adjustable motor timing ??

How do you know if the motor is suitable for boost?

I have speed passion Ultra Sportman 21.5T.. I wonder if those can be boosted by ESC (hobbywing 50A SD esc) ?

I have never heard of a BL motor that couldn't be boosted or turbo'd. All motors have their limit dependant hugely on gearing and type of vehicle. Boost and turbo away.