thank you GTST, i do realise i have done a few things wrong. just trying to rectify my mistakes now. like i said above i will pull it apart this weekend and see what i can find, il post up some pics of the damage and ask for a few ideas as to what caused it if it isnt obvious. and i cant see what else could be needed for it to cost more, if its a dead piston buy pistons, if its just rings buy rings. the couple of suggestions i have had is as follows, over boost causing detonataion killing piston, over fueling causeing the oil to wash off the bore and rings are dead, faulty injector causeing lean mixtures causing detonation killing piston. feel free to add to my list.
with the rb30de, how does that go with converting to 4wd? just swap the sump/oil pick up or is a matter of completely modifying stuff?