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Hi guys So I have an altezza with the 3sge beams, pnp g4 altezza link ecu and greddy tdo4 turbo kit. Was currently running on a turbosmart wastegate actuator with 7psi spring, tuned at 9.3psi for the last 3 years with no issues. (Was never sure how it managed this with no boost control on a 7psi spring but worked perfect) On my last track day the car suddenly dropped to 7psi boost and would not boost higher and felt sluggish. I initially though boost leak etc. Found a few and now passes boost leak test perfect. Fitted a new actuator spring and wired in a link boost solenoid. My tuner on the hub dyno however could not get the car to get up to its previous 172rwkw. even using the new boost solenoid, it could make 9.2psi but has lost around 20rwkw. he then noticed that the car wasnt responding much to timing changes where some runs would start off good and then drop out, or some runs would just not start off good at all even with no changes to the ecu. He was then thinking maybe sensors or vvti solenoids so I have changed all of these and still no change. Could it be a sign the turbo is just wearing out or something to do with my vvti system? turbo has been on for 3 years with around 5 track days and weekend driving 30,000kms. I have attached my tune file and a log file for a recent test drive logging the intake and exhaust cam positions and targets and solenoid duty cylces. Also a last question is the DI2 value (where the exhaust cam sensor is wired to) never illuminate green or says on when driving, just stays unlit and OFF. (ie the power steering DI1 will illuminate green and change to ON when turning). I have checked all sensor have ground and continuity back to the ecu input pins, and all 3 (crank, intake and exhaust cam sensors all have readings of 1.02 k ohms).Thanks Thanks Brendon Brendon original tune 5.0.3 01-10-16 (after launch control and cold tune start fixed) with boost solenoid settings.pclr vvt log drive.llg