Ok, so i found the engine was low on compression i wasn't sure what was causing it, so i kept putting oil down the cylinders to bring the compression up and it worked eventually, and the GTR fired up (but was blowing smoke for ages due to the oil of coarse) after leaving it running for quite some time and then driving it the smoke cleared away, so the i thought id try to put some more revs on it got to about 3,500rpm and then i heard a loud whistle and clink clink clink noise then smoke started pooring out the back again... so its blown another turbo..not sure yet if its the one i replaced or the one that was still ok!!
what a shit of a job pulling all that off again!!
if its the rear turbo again i wonder what is causing it to blow lack of oil to bearings? the oil line seemed fine and was pissing out oil when i removed it the first time.
bloody car!!! lol