GU RD28 boost spike, engine power plateau
Hey trollers,
Over the last few weeks I've noticed the boost on my GU RD 28 spike every now and then. Usually the boost gauge reads 10-11psi flat-foot, but now when it spikes it goes to ~13psi then drops to 9-10psi and won't budge until I shift down or get more revs. Also, when the boost drops, the engine power seems to plateau or sometimes the power feels like it's bunny hopping. The problem is, it doesn't happen not all the time :\ I've been able to notice it usually after ~45mins driving, when sitting at ~70kmph in 4th gear through to 90kmph in 5th.
I didn't find cracks/splits in the intercooler pipes, not really sure where else to look? Any ideas?
Cheers!