Very little info on this. Just had vanos valve fitted due to my car having erratic tick over replaced vanos solenoid and runs perfect but since having it done it seems like ive lost 40bhp and only half the boost power.
Checked all connections under inlet manifold also checked turbo diverter valve incase by coinsidance it failed but diaphragm perfect turbo spools up ok and checked for turbo pressure leaks Nothing.
Has anyone else experienced this or maybe a pipe put back on wrong. Weird one.....
Also had new HPFP fitted and new thermostat housing all on the same day. Cars running on all 4 cylinders starts perfect just half the boost.