Other issues we might get into are power bands and how they are altered, realistic goals for street engines (especially the older ones like OHV and SOHC engines and the older Japanese stuff), engine control systems and fabricating.
One point often overlooked with turbocharging is the power to weight ratio of the original unturbocharged vehicle. A low power to weight and heavy vehicle will gain mightily from turbocharging.
They are brilliant on underpowered factory road cars.
An already very powerful and very light weight vehicle (such as a sports bike) will gain almost nothing in usable acceleration through the lower gears, only flat out in the higher gears will a much higher top speed be really noticeable.
It may post spectacular dyno numbers, but be temperamental, peaky, laggy, much harder to ride, and no quicker on a very tight road race circuit.
There have been no successful turbocharged sports bikes put into production, and for very good reasons, and not because it has never been tried.
After about forty years of personal turbocharging experience, I wonder if it is really the right approach for a Locost type of vehicle ?
Not that I don't like turbos, I certainly do, but they would be far more suitable for a four cylinder street driven door slammer with yards of sheet metal, than a featherweight spider framed performance oriented Locost.
A screw supercharger would be a much better approach for our type of driving.
That is how the Ar-i-el At-om gets its 450Hp, and that is a very serious bit of kit....
Very fast engine acceleration and razor sharp throttle response is what is needed for our little cars with potent mid range torque.