[davidp]

Originally Posted by xxBrun0xx

Yes, you can get better mpg in a turbo 4 than an NA 6, which is what the OEM's you speak of are doing. Would adding a turbo to an existing engine increase your mpg? I don't think so because 1) You're adding weight, plain and simple. More piping, the turbo itself, maybe an intercooler, more coolant/oil lines, etc. 2) Once your turbo is spooled, you need to run very rich to prevent knock. In an NA car under the same load, you can run far more lean, and are therefore more effiently using your fuel to make power.


I could be wrong about this, and if I am, I'd love to know why. I'm happy being wrong if I can learn something.

atm turbo is more fuel efficient efficient than n/a past a certain point around 80HP per litre of displacement