If yes, one of the reason might be insufficient engine oil pressure. The ECU will not enable the MIVEC solenoid that activates the high cams profile of the MIVEC if not enuff engine oil.
what i know from friends is that the VJ23 are considered quite big turbo... but just wanna find out more... if using a 1.8 engine what bigger turbo can be used without increasing too much lag??