I do not think the f8x gets an turbocharged engine with an additional electric turbo (electric compressor), there are some things that are probably messed up in the world of forums.
I assume that the M3/M4 will have an adapted mechanical TriTurbosystem from the N57S, in which possibly the first small turbo, which is responsible for the low rpms, is supported by an directly on the shaft of the turbo acting electric motor.
If this - patented by BMW - technology is mature and stable at time of series production, it could close the turbo lag completely.
One or more electrical compressors are rather unlikely to me, because those parts rather have the reputation of cheap aftermarket tuning and BMW's patent is clearly more effective to eliminate turbo lag
Greets Uli_HH
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