an O2 spray into your intake to cool it down??? why use a sc in the first place if you got o2 spray
zfury, i really like centrifugals, and i think its a decent, easy setup for some street applications because of its simplicity, but what has been stated it true, turbos are much better then superchargers
for example, you have a motor that will rev to 7000 rpm and 10 psi is the max it will handle without blowing up.
centrifugal: you will have boost right away but your setup will only be able to have 10 psi max (or itll blow up). you can set 10psi for 3000 rpm but when you go to 3500 rpm BOOM, so you set it up so it'll have the 10 psi at 7000 rpm. that means that it should have 5 psi at 3500psi (considering its perfectly linear). You will have a very nice lenear torque curve all throughout. next gear you'll be back at 5000 rpm and have to climb the boost ladder.
turbo:again, a turbo that will do 10psi (which wont be a very big turbo at all) at 2000 rpm you probably wont have any boost, and the motor may even be a little slower than N/A because of the extra backpressure. but at 3000 rpm itll start to rise and will probably be 5psi, and by 3500 itll become 8-10psi. and from then till redline it'll stay at 10 psi. next gear, at 5000 rpm you'll be at full boost and you'r flying
your right up to 3500 rpm in 1st gear you may make more power so say in 1/4 mile race the first 2 seconds you will be faster but soon after that the turbo will catch up
this is all not considering parasitic loss
I like centifugals because if you dont want an all around faster car, but instead a cheap, very simple setup that you could setup in one day, its the way to go.
If someone could post a dyno of similar motors with the same boost with a turbo and a sc. i member a mustang magazine where they did just that. turbo, cetrif, roots and screw. you could easily see the actual numbers and differences in how the power was delivered