I have no experience of supercharging a7's but have successfully supercharged other classic cars.
My first thought is that the Supercharger you have looks MASSIVE for a 750cc engine. Do you know what the effective volume of the blower is? These are usually rated at so many cubic feet or meters / so many thousand RPM.
To some extent the blower should be matched to the size of the engine, too small & the blower is always over revving & heating the mixture up too much, too large & it is never working efficiently.
My first thought is that the Supercharger you have looks MASSIVE for a 750cc engine. Do you know what the effective volume of the blower is? These are usually rated at so many cubic feet or meters / so many thousand RPM.
To some extent the blower should be matched to the size of the engine, too small & the blower is always over revving & heating the mixture up too much, too large & it is never working efficiently.