Darren i was impreswsed with Boostworx, they haven't sorted out the problem with the pinging yet but are getting some more stuff (ecu ect.) to try. They checked all the timing, mixtures and the standard ecu and it didn't come up with anything. Turns out my "standard" skyline has a few after market bits like the oxyen sensor which may be causing the problems.
Starting to think i might sell this 33 and save up for a GTR