Compound Procharging!

[Gtrpunk23]

Isn't the point of force feeding to help spool up in a turbo application. I may be way off but I was under the impression that a smaller turbo is used to spool up quickly intern help the larger turbo spool up and get to peak boost/power. I am CERTAINLY no expert at all, I am very interested in this thread.

[Procharmo]

Isn't the point of force feeding to help spool up in a turbo application. I may be way off but I was under the impression that a smaller turbo is used to spool up quickly intern help the larger turbo spool up and get to peak boost/power. I am CERTAINLY no expert at all, I am very interested in this thread.

Yes your correct. But turbo's have different sized hot pipes and turbines to fine tune the percentage of exhaust gases that turn either turbine.

Then each impeller and volute is sized so that the interstage pressure and volume dose not cause surge in the secondary turbo.

Finally the pressure ratio of the first is multiplied buy the second along with a drop in density caused by heat. So it can get pretty complicated to work all of this out in theory or very expensive in practice....