Decided To Go Big Hp

[BensDR30]

Why do you want to dished pistons?. Flattops Have a better flame front.. Higher compression isnt a problem. Its all the the tune..

Btw, you don't need a 3.1L to make 300rwkw.. You can do 300rwkw on a Stock n42/n42 combo l28... You don't need the cubes for the power in the L Series..

I'd dispute that. My own L28 N42/N42 combo was only good for 13psi on 98RON + octane booster before detonation was unavoidable - the chamber shape is just not good enough for cylinder pressures that high.

That turned ~140rwkW via the auto, using a 450x300x75 FMIC (2.5" piping), MSD6A, VG30ET turbo (0.120" enlarged turbine outlet w/T4 comp), Pipercross induction & 2.5" SS split-dump/system with 1 muffler. (along with heaps of other stuff, but you get the picture).

Torque was pretty impressive though...

You really need a P90 head for decent combustion control - and I have one of those that's now good for 320HP on the flow bench, along with a forged-piston bottom end, prepped rods & ARP fastners. Turbo will probably be a T3/4 'Stage V'-esque setup from somewhere like Turbonetics. I'm hoping for 210rwkW, and no fear of breakage.

You're simply not going to make kW numbers that shame an RB25DET out of a non-xflow L-block without some serious work - I wish it was that easy. The rod/stroke ratio of the L28 doesn't help either. You will be able to get good torque - and that's because of the cubes, not the rpm's.