Sorry TurboSE, I wasn't implying anything. Just replying more or less as a question about the difference between the N1pump, and the orig. OEM factory assembly line pump. It was meant to mean that there is a difference other than a spring, as said by other member.
I'm using a JUN pump. Do I need it...? prolly not. But I got it...
I think if you have the wide oil pump drive crank, and you don't stay on the rev limiter, or launch control, you should be fine with a Genuine Nissian oil pump. There are thousands of RB26's still going strong out there in the world, using reg oil pumps, but they are not being abused either.
I honestly would feel fine using a reg pump on my set up (R33 crank with wide oil drive) because of the way I treat my motor.
I just had to have the JUN at the time, cause I was in the "while I'm at it" frame of mind while building my car...