Few things to look out for. You need to alter the way the fuel tank vent system works, otherwise your charger will pressurise the fuel tank!
I would replace the metering head with that of an early ur due to changes in the flow rates and way it operates with a presurised system. It will need more fuel and the timing advanced, bigger fuel pump and injector's needed. It's all fairly straight forward if it's a K-Jet to be ho9nest. I was going to supercharge my 90 but plans have changed!!! The A6 may have it now though!!!
You will need to give the brakes some vacuum too. If the car's supercharged then at no point will the manifold be in vacuum so your brakes will get none at all! You can get round this with a suction-jet-pump from a TT 1.8T. Its a simple by pass valve that causes vacuum via a venturi and non return valve.
You may need to make a bypass system for boost pressure too that releases boost when you let the throlttle off or you may get terrible shunting when letting off from high revs as unlike a turbo, the super charger will still be producing big boost that the engine cant use. This makes the engine continue to accelarate as some boost will leak past the throttle valve. This is also a problem at idle and part throittle. You only really want it producing boost at high throttle applications.
I shall now be quiet as this post is getting far too long! SORRY!
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