After reading this thread a few weeks ago, then again today, I am still unsure of what to do for my application, so if someone wouldn't mind pointing me in the correct direction...
RB26, acl race bearings with calico coating, have not decided on pump yet (JUN if money allows, N1 if not). Anyways, the car is a daily driven street car but sees the cicuit time about once a month. Revs should stay below 8000rpm at all times (7500rpm shiftpoint, 7800rpm revlimit). Would you say that 1.25mm would be the best since it is in between the two applications or should you just go straight for the 1mm since it will see the track on a regular basis?