I can manage to make these values in to parameters, but I've not yet found a way to externally workout the flux linkage and the d q inductance difference for a specific motor.
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
"The only configuration parameter needed is the Lq-Ld difference which determines how "tilted" the MTPA trajectory is. Torque increase depends on Ldiff and flux linkage, in a motor with high saliency it can yield a 40+% torque increase (nissan leaf motor) and the % gets bigger with more amps." Some bold claims.
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
Also found this paper that at least acknowledges the issue of phase delay between current and position measurement. Doesn't present a solution though...