[solstice]

I understand what they are doing and I suspect they have investigated it but I'm not in anyway or form convinced that driving a turbine optimized for exhaust sourced energy is the most efficient use of the electrical energy you have access to.

Do you think it makes sense from a scientific/engineering aspect that an exhaust driven turbine just happen to be optimal to also be driven by an electrical device?

You should be able to separate energy generation and the use of it. I.e independent of what boost device you use, you can use the same device for re-generation.

Do I think I know better than Renault's and BMW engine cream of the crop engineers? No, but from a pure scientific aspect there are question marks of efficiency.

I think you misunderstood my "off boost", I meant when the turbos are below minimum boost, I.e both to keep the system pressurized when the intake is closed and keep a constant flow of the same boost from opening until the turbos spins up and take over.