Hi, I am planning to fit a charger on my alfa romeo to increase the power and since it revs and peaks low (5600 peak power and 5300 peak tourqe) i will use a supercharger instead of a turbo, but since they are expensive I will use half a turbo (the tubine that sucks air) and fit a pulley to atttach a belt so it can be driven by the crank.

My question is how much does a turbo charger turn or rev due to the exhaust??? a rough estimate will be enough since my eninge dosen t rev that much but if it revs more i will be using a gearbox to add more turns ur change the pulley sizes to add or reduce the turns untill i can obtain the boost i want