Quote:
Originally Posted by scrming
My mods on the ST are:
Cobb 93 octane tune
MRT axle back
Green replacement air filter
That's it!!! Not really significant at all! We've. Got our Flex cranked up to about 500 HP with just a tune and some methanol.
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I find it hard to believe you got a nearly 50% torque gain over stock with just minor bolt-ons and advanced timing. You must have upped the boost several psi as part of the tune.
Quote:
Originally Posted by Number 3
A turbo 4 will get better FE. Not a huge amount better, but if you look at the ATS you'll see I think 28 mpg for the V6 and 30 mpg for the 2.0 T.
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I don't think a turbo-4 will get any better fuel economy than a NA V6 at all, not as long as you compare engines of similar power. You can't compare power vs efficiency between the ATS V6 and turbo-4. The V6 makes 50 more horsepower.
Shrink the V6 in displacement until it was down to 270hp, or grow/tune the turbo-4 up to 320hp, and I think their efficiencies would be identical. Only differences would be the cost, complexity, and long term expensive repair potential.