Highest hp OM613
Highest hp OM613
It will do 180-190kW "as-is". Then first bottleneck are small injectors and CP1 which will not support greater power anyway. I have upgraded C30CDI injectors and CP3-L110 pump, it burns cleanly around 125mm3 so my guessing is that it makes 220-240kW. Could go much higher but GB will fall apart. Anyway look at Blacksmoke OM648 compound build. They had 500+HP and mechanically it is exactly the same engine except it is working on higher rail pressure from factory.
Gear box.. it is W580 hence made for maximum of 580. It is reported to hold more but for how long and it is not new.. so you would have to strenghten it or mount one from S600 biturbo which will withstand 1000Nm just fine.
722.6xx is also called w5a380, w5a580 or w5a900 .
What you can do is indeed like the guys say: take the most beefy gearbox, but then swap the bellhousings, because of the different bolt patterns.