R33 gtst
ecu - unichip with boost control module. this module controls boost via the standard solenoid, through the ecu. i dont know any more specifics than that
recently my boost dropped from 12+psi which was set on the dyno during a tune, to what seems to be stock boost.
basically i drove home from the tune, saw 12+psi once on that trip, and parked the car. 2 days later, stock boost level.
its now running about 9psi, which i'd consider stock for 3 inch exhaust, fmic, and pod.
just for the record, ive had this ecu and boost controller previously tuned (same tuner) and working flawlessly for ages before this.
i instantly thought one of the hoses to and from the solenoid and actuator might be stuffed. checked all those, they are fine. no blockages or leaks.
(even though a leak or blockage in most cases would cause higher boost)
then i thought it might be the solenoid itself. i could only find a VL solenoid, so i tried that, but no change, then i tried it back to front , coz they are slightly different than the r33 type, and i wasnt sure of orientation. it then boosted to 15psi. so i figured they are spec'd differently, and a factory R33 solenoid would fix my issue for sure. well i got a used one, and no change. still running stock boost.
ive checked voltage at the solenoid plug, it shows 12.?v at idle.
the car drives fine, pulls hard, but only to 9psi, so its not likely theres leaks in the cooler piping etc. ive looked anyway. even blocked the bov just to make sure it wasnt leaking from there. plus the 15psi kind of discounts these.
the car will be going back on the dyno shortly to see if its the actual boost controller/settings. the guys have been moving to a new workshop, hence the delay.
so, besides boost controller, has anyone got any thoughts on what might cause this?