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Last time I checked turbos were powered by exhaust energy, thus a more efficient more powerful engine will spool faster due to the extra exhaust, but at the same time you will run into back pressure faster with the same turbo (where exhaust gases can't get out and back feed into the combustion chamber), this is why proper turbo selection comes into play, this what I was saying about you couldn't spool the turbos we run on the FRS worth a damn on a EJ20. Google all the graphs you want but race results prove it all.
As far as lowering cylinder compression on a turbo motor, you can simply do that with the exhaust cam angle, this is done for emissions already.
As for cams I'm sure they are working on them but I'm sure R&D sucks for that since you have to keep pulling cams in and out which would involve pulling the motor everytime, plus I'm sure while people are asking about them it's gonna be awhile before people actually start buying due to the install process, once more people are building engines I'm sure it will happen.
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