yes increasing the c/r does increase v/e however, your reducing the amount of space within the engine that the mixture can occupy so with big turbos you loose more than you gain with a higher c/r.
turbos only lag if you let them drop off boost, the t34 on my car is lag free as long as you dont let the revs drop below 4,000, and thats without any form of anti lag gubbins.
drive them like a cammy engine and they should be lag free
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