Can someone please help. i keep hitting the fuel cut on my '95' sti im running a polar performance chip that lets me boost to 1.1bar but every now and again it will go past that and my fuel cut kicks in making me look like a twat basicaly

I dont think there is a leak as i have checked for split hoses. i had a slight feeling it might be my DV but ive changed it and not noticed anything. is there a way of raising my fuel cut? or disabling it? i know its not the smartest thing to do but i dont know any other way other than lowering the boost which i dont want to do.
Any suggestions will be appreciated!... cheers Alan