I will try with a 3way valve that i got from an old vw and use arduino to analyze the signal and switch the valve on and off using a mosfet transistor.I hope will be fast enough since the only moving part will be the valve itself.

By the way what boost should i look for? I was going on 5psi for the start until working right and then going up to 7psi.Is that ok i`m off.
Hope till friday i can mount the turbo again and test the valve.Still have to write the code for the injector and buy a 2bar map.