wi questions for a strange car

[mpakakas]

hello i'm from greece and i want to put a wi to my car but none here have any idea.I also have a strange car.Well lets start. My car is a renault 5 alpine turbo.The strange with this car is that it mounts the carb before the turbo so the turbo dont just boost air but it boosts all the air/fuel mix. after the turbo there is just a pipe which goes straight to the inlet.There is no intercooler because of this setup(a/f in turbo). So only the wi will help me. I boost up to 1 bar(14,5 psi) but i retard to much. Please help me with the questions i have.
1: where sould i put the jet before or after the turbo?
2: what jet should i use and how should i calgulate it(i dont have injectors to calgulate the fuel that my car uses in order to make a 15% wi, i use carb)
3:in what psi should the wi work?
Finally do you think wi is agood idea for my car? Thank you very much you are the only one that can help me....