Compound Turbo on a DMS

[eraser4g63]

Found this while trolling a DSM forum. The guy is currently running 40PSI.
There are some vids near the end of the thread.
The Forum

Just Wondering what ya'll thought of it.

[j0nbunklah0m]

im confused. he put a turbo on a turbo to spool while he spools?

[eraser4g63]

The Bigger turbo compresses the air that the smaller turbo compresses.
Taken from the other website.
Turbos multiply atmospheric pressure, not add it, but function by multiplying it. Therefore if the small turbo as a single can take air at 10 psi, and produce 40 psi boost, it is multiplying the air by 4 times (10psi x 4 = 40psi). The large turbo can do a similar job. Therefore let's say that the large turbo multiplies by 2.5 times, it takes 10psi (atmospheric pressure, where we are located at 4300 feet above sea level) and makes 25psi. (not taking into account abiatic efficiencies), now the small turbo will see 25 psi at it's air inlet, but it think it's only seeing atmospheric pressure, or literally over double the amount that atmospheric would allow.