Im was running with 240rwkw at 1bar thru auto on my S1 rb25det Stagea. Bottom end has finally let go after a handful of trackdays, compression in cylinder#5 is v.low.
Looking to rebuild the block in a few months time with N1 oil & water pumps, a fresh nismo timing belt kit, wiseco 87mm pistons with manley rods, arp rod bolts & main studs, acl race bearings, a fresh full cometic streetpro gasket set, extended crank collar, & honing the block to suit. I'll be upgrading the 450cc S15 injectors to 600cc and installing a Nistune Z32ecu to replace the Toshi remap and AEM Fic-8 piggyback ecu.
The head has been ported a few years ago, setup with tomei cams and springs, etc. Turbo is a GT3076iw. Everything already done is strong and ready for a forged bottom end.
What Im not sure about is whether I should get a Ross harmonic balancer and under-driven pulley set, and whether I should bother thinking about a reimax N1 oil pump gearset or a different oil pump altogether such as a Nismo oil pump for around $1100del. Engine would probably not see track work again, but I would like to up the power by around 30rwkw for an end result of at least 270awkw from 16-18psi from the auto/awd stagea.