The turbocharger normally fitted to a Valenta was replaced on these engines by a single supercharger, gear-driven from the free end.
It's a bit like having an engine turbocharger that works in reverse.
An electrically assisted turbocharger is employed to satisfy its supercharging needs.
There are many tradeoffs involved in designing a turbocharger for an engine.
For applications utilizing a larger turbocharger, APS recommends the use of a high performance blow off valve.