increase rev limit of rb25det series 2

[finallymysti]

so, i want to increase the rev limit of my series 2 rb25det. whats needed to do this ? i'm not looking to make crazy power, so i don't need to build the block, but on the head side of things whats needed? thanks

[jr_ss]

Springs at the very least. However, there's no need to increase the revs if you're not making power up there. You'll prematurely wear the engine.

Reasons to increase rev range; you've swapped in a larger turbo and/or upgraded cams/valvetrain.

Reasons not to; oiling issues, rev higher without making power.

[BigKriss]

My std RB25 went to 8000rpm no probs, did have the head oil drainback problem though. Head drain mod and all was good. Motor lived for over 5 years..