Ok here's the story, i just got some bits and pieces bolted onto my engine and now when it was getting tuned the boost was wound up to 13psi and then if any more boost was put in or timing put in the engine started to ping.
The exact mods are:
FMIC, 3" turbo back exhaust, low mounted biago turbo (same size wheels as t03/04e but smaller housings), z32 AFM, z32 ECU with nistune, nismo 740cc SF injectors, catch can.
Original thoughts were that the cat converter in the exhaust may have been creating too much back pressure so the cat was removed and still the enging detonated at 13psi, second thought was that the rocker covers were being presurised so fitted a catch can and still engine detonated at 13psi.
Any thoughts or tips would be appreciated, but no stupid comments please.
Thanks all