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What I don't get is why they need a 1.4ltr on a series hybrid.
The whole purpose of a series hybrid is to use a taylored high efficiency SINGLE SPEED motor to drive your genny. Like the 60mpg military turbine generator powered humvy we all got our panties in a bind about several years ago. You can easily gain 25% by setting a motor up to be tuned for one speed.
Also to me that would mean a 1ltr NON TURBO should be sufficient to maintain 65mph. (And I doubt GM would have any trouble finding a 1ltr engine, it seems many here still drive one with a GMish badge on it.)
Your goal of coarse would be to fire up the motor to the ideal operating speed REGARDLESS of vehicle speed once the generator charges the batteries a predetermined ideal amount (depends on how long the motor takes to get "ideal") Then shut down and cycle on and off as needed while the vehicle motors along. Sort of like pulse and glide, allows the motor to only operate in its most efficient band.
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