ItsStockOfficer...."you cant add air without increasing pressure"?
lightweight...."It will still be 6 psi, just more cfm."
You both are a little off track, as a mechanical engineer that has take multiple thermodynamics classes, please let me clarify.
first off, 6psi from each turbo will be 6psi total since pressure is not additave. ie, you have 2 air tanks with 6psi and a connecting valve....open the valve, pressure equilizes, 6psi in both tanks, not 12psi.
2nd, since waste gates are part of the closed system of air pressure, they will both crack at the set pressure, 6psi in this case, since they are both measureing from the same source, the manifold.
As for for CFM, that is another story. First off, CFM is a measure of volumetric flow (velocity * area) , not mass flow (kg/hr or lb.min, (volumetric flow* mass)). Volumetric flow is a poor measurement to use for turbo's output. Since "The indicated power or an internal combustion engine at a given speed is proportional to the MASS of air combined in the cylinder"(Ramos, J.I, p384, 1989), mass flow is the paramater that is directly related to torque. Flow is not what makes power, it is mass flow. With 2 turbos with each wastegate set @6psi, pressure will stay at 6psi at the manifold and mass flow will double since:
massflow_in = massflow_out
mass flow_1 + massflow_2 = Massflow_3
but ive been wrong before...
MET Purdue University
393"/twin T70/full accessory/billet ITB intake/stock hood/alum. 3.5" exhaust
Shaunthony's: you're gonna want to wear a cup