New supercharger really shifts: This is brilliant. Someone put a transmission into a supercharger. So when the engine is turning at lower revs, the supercharger is geared to turn much faster in relation to the engine. When the engine revs up, the ratio of supercharger revs to engine revs comes down.
The new supercharger setup ain’t cheap (you are looking at between 3,000 and 4,000, euro once it’s on the market), but it promises to pack a wallop of power unseen in this end of the market: Normally, you’d expect up to 50% efficiency out of a supercharger, but this setup promises up to 85%! According to the manufacturer, an engine with their two-speed supercharger fitted can exactly match the torque curve of a much, much larger naturally aspirated engine.
Why did this idea take so long? Via MetaFilter.