Hi, guys Ignoring the wisdom of this forum I purchased a new Boost control valve off E bay I should have listened! It made no difference at all Still the same problem as before , Just $50 poorer Anyhow I've now fitted a Dawes valve and asking what is acceptable boost pressure for this engine (D40 2.5 liter) Driving on the flat in cruise control at 100Klm boost pressure is around 5 psi Going up a hill it can rise to 14 psi before dropping back a bit What is an ideal pressure rang for this engine ? Regards XK kat