| making generalized comparisons of efficiency, although I do agree with you in that it has limited application. The engine is simply an air pump - the more efficient it is, the better the conversion of the chemical reaction into mechanical power will be for a given displacement. It is no different than any of us comparing dynocharts between given setups to make a determination on which configuration produces the desired response/powerband... we just dont typically break it down to HP per litre given that it is assumed we are all working with 3L of displacement. Since we were discussing a 3.0L engine vs. a 3.5L engine, some method must be used to make a determination on how effectively those two engines are making use of their displacement. Granted, this is a generalized method, but in most cases it will lead you in the right direction. You could break it all down into area under the curve and standardize the results based on displacement to get a much clearer understanding of which engine is making better use of its displacement across the entire operating RPM range. In that case, given that the VG30DE redlines at 7000RPM and the VQ35 redlines at 6500, the VG30DE likely has more total area HP/TQ per litre than the VQ. That extra 500RPM of spin in the VG30DE likely will add back more total performance than the 6HP/L lack it showed in the generalized HP/L comparison. I'm with you.. :)
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