no oil / water usage, the head was checked and skimmed cus it was not perfect before fitting , i had a tick when on boost for a week or so, which i could not put my finger on ( like a exhaust gasket tick ) but sounded like a fooked cv too ! i returned the car to my mapper, he ran it listening for the tick but he could not here it, he road tested the car too, but he did not find a fault , he decided to do some more mapping while i was there and increase the boost to 1 bar as the engine had done some more miles since, but still not run my planned full boost figure! on the way home the tick was still evident however he had run full load,full rpm runs without incident so i attributed the tick to a drivetrain problem that i would investigate or would fail then i could repair it, but it would appear it was the head gasket ?
first mapping.