Silvia Club of NSW

ive got an sr20det 180sx and when i first start the car say in the morning and let it warm up a bit then drive it, runs really good and after say if i keep driving for about half an hour 40 minutes straight and the engines warmer, when i accelerate hard at about 7-8psi it starts to just cut off and spluttrs and doesnt want go past about 4000 rpms or it doesnt have the same power that its supposed to give and its even worse on high boost, u feel the car pulling then cuts off with more boost and it feels like really big splutter and just doesnt move ... ive had this problem for a while and ive done an oil change and it made it bit better used to do it jus drving it for 15 mins and it does that cutting off splurting thing.. dunno wat to do, just change the plugs to iridiums and didtn make a diffrence, got a walbro high flow pump... jus need help wit this if neone can thanks.......
also the turbo is right next to the igniter chip could that make a diffrence