[quote=“ImportMuscle,post:15,topic:35303"”]
iirc volkswagen was developing a motor for this…
1.4L inline 4 cyl making 180 hp
supercharger worked at low speeds, turbo took over for top end
lots of boost, no lag
[/quote]
That works really well but is fairly complex. Just running a supercharger into a turbo or vice versa is terribly inefficient.