as title really, sapphire cosworth 2wd. made 513bhp but these last few months the turbo barely comes in. when it does come in it reaches its 2 bar in a big rush (usually near the top end of my rev range) sometimes it don't come in at all even up to the rev limmeter.
its got a turbo smart external waste gate with screamer pipe, on idle nothing seems to be coming from the screamer pipe sujesting the valve is closed??
no abnormal play in turbo shaft etc. it used to be fine, its funney because it seems to have all started after I installed my coil pack conversion, is this coincidence?
im stuck.
martin