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As said previously, the engine structure was optimised for a maximum of 600 bhp, it is not like the RB26 block and over engineered. Obviously these days over engineering the product adds weight and cost, and mass effects fuel economy and emissions...EU and ULEV2 emissions are difficult enough to achieve in the first place, hence you simply can not make it bigger than it needs to be these days!!! Nissan are saying this is an engine that should NOT be modified, and it does break if run much above 600 bhp - just the way it was designed!! Failure mechanisms are numerous, but the main area would be the plasma coating/piston/rings. That said, the big end bearing is on the limit too.

"apparently its the same block bored out and twin turbo'd,and yes it is a renault engine"

As I said, loads written on this already, but it is not a VQ35 block...this is diecast and deep skirted, the VR38DETT was designed to be sand cast (using the CosCast process) and is a ladder frame design. Design wise the VR38DETT block all different except for bore spacing, bank stagger and bolt spacing - is taller (deck height 244mm Vs 215mm), different cooling jacket (water jacket depth of 60mm, different layout), closed deck (VQ35 is open deck), long head bolts design, different oil gallary layout, bigger main bearings etc, etc, etc.
So, actually, there isn't much in common with the VQ --it's an entirely new engine. It seems like it is not at all based on a VQ design.
 
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