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More reasons for changing gearing
During cruising, the turboed car will have worse efficiency than the NA due to the lowering of the compression ratio by about a point. You will certainly need the improved gearing. Of course, you could get away with the same gearing without the turbo, and just be willing to shift the car a lot.
Me, I'd take an even taller gearbox, a bigger turbo (with good horsepower gains for when I want them), and a methanol injector to keep the compression ratio up. Actually, a DTI would make a lot more sense...
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