We study the long term time averaged kinetic luminosity , \overline { Q } , of the major flares of the Galactic microquasar GRS 1915+105 and the relationship to the intrinsic X-ray ( bolometric ) luminosity , L _ { \mathrm { bol } } , and scale it to that of a complete sample of SDSS/FIRST FR II quasars .
If the scale invariance hypothesis for black holes ( BHs ) holds then we show that the expected distribution in the \overline { Q } - L _ { \mathrm { bol } } scatter plane of GRS 1915+105 is consistent with FR II quasars for distances D = 10.7 - 11 kpc .
We compare the specific values of kinetic luminosity and L _ { \mathrm { bol } } during flares of GRS 1915+105 to that predicted by several 3-D MHD simulations of BH accretion flows with relativistic ejections .
If FR II quasars are a scaled up version of GRS 1915+105 , the data are consistent with numerical models when they contain an ergospheric disk jet and the BH spin is a / M = 0.99 or a / M = 0.998 ( we estimate a / M > 0.984 ) .
In the framework of scale invariance of BHs , our results may imply that FR II quasars also hold rapidly rotating BHs .