Quote:
Originally Posted by niky
But for economy... they take a very long time to pay for themselves.
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Depends what car, how much you drive, and what EMS. If the car is less fuel efficient and there are easy tweaks to save gas it could pay for itself quickly. For example, Porsche's M96 engines had a very dumb VVT setup that was always advanced, simply switching that off would get you a bit more mpg.
Another thing you can do is use a 200 dollar narrowband simulator with wideband O2 to make your engine run lean, but you would not be able to run as lean as with a standalone and so it would save you less fuel. However standalones are like 1k minimum.