Quote:
Originally Posted by AeroMcAeroFace
Obviously a turbo allows more fuel into the engine, but does it make any difference to cruise MPG? The IMA presumably doesn't do anything at cruise, or maybe it does boost and while doing so allows the engine to go into lean burn.
Theoretically, ignoring that you have to accelerate, is a turbo insight going to get better or worse MPG at a constant speed cruise?
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An observation:
1) on the roundtrip to Oklahoma City, without the IMA, I was forced to downshift from 5th, to as low as 3rd gear, on all the rolling terrain, in order not to impede traffic on the interstate.
2) turbo boost would have effectively increased displacement, power and torque, by virtue of the overpressure charge density.
3) it seems quite reasonable that, a turbo would help compensate for the lack of electric boost, lessen the need for downshifts, and end up improving mpg, as current EcoBoost, SkyActive, Dura-whatever, small displacement turbo'd engines are doing. Engineers have vigorously pursued them since 1973. You're basically purchasing something beyond a COSWORTH racing engine of the 1960s, with 100,000 + -mile durability.