The piston wear shouldn't be an issue as Nissan will have to cycle (high/low compression) the pistons anyways otherwise the split ring will catch on a the lip t

The piston wear shouldn't be an issue as Nissan will have to cycle (high/low compression) the pistons anyways otherwise the split ring will catch on a the lip that normally occurs, it would be nice if they used sleeves in case there is an issue but I doubt they will. How would the turbo over boost? The ECM controls what the turbo does and if the waste gate is open or not. It would be interesting to see if and how they control compression to each cylinder, maybe a waste gate at each cylinder on the manifold. The issues I see: * Regular gasoline explodes from too much compression, if this engine requires premium gasoline it's sort of dead out the door. * NOX emissions increase with efficiency and in general efficiency increases with compression, there are two prevailing ways to fix this: cheat and inject urea. * It greatly complicates where all the force is being generated which will probably lead to more failures.