***Topgunz ROTREX C38R Supercharger Kit***

Originally Posted by 14Q60awdSPORT

This isn't 100% exact, but still a good illustration of what is happening and comparing the different boost "maps" Also added a typical TT for comparison.

A traditional "normal" centrifugal SC setup will choose a pulley for desired max psi IE 10 psi pulley will make 10 psi at 7500rpm, but only about 4.5psi at 3.5k rpm.

The topgunz kit will make about 23psi at 7500rpm, letting it make 10psi at 3.5k rpm. if you targeted 10psi the entire time you would bleed off through the BOV the excess boost over 10psi, so at 7500rpm you would be bleeding off about 13psi. your boost would follow the orange line until it hit the green line then follow the green line to redline.

at 3.5k rpm you are making 5.5psi more vs a traditional centrifugal SC setup which will result in a lot more torque/power in the mid range.

or compare orange to green following green vs the blue line, all the area in between those lines is the extra boost you are making through the entire curve despite both setups making 10psi peak.

and then you obviously have way more headroom to turn up the topgunz kit if desired without needing pulling changes.

Originally Posted by 14Q60awdSPORT

This is what I'm really interested in.

What would the psi of the "Standard" pulley be?

With my current setup/tune I could keep my map exactly same on a 16psi pulley and not be spinning the SC as much all the time.