Originally posted by TurboJZA70
larger turbos have the same flow rate at a lower boost.
a supra with stock turbo can flow lets say 500cfm at 20 psi. but its very hot air.
but upgrade the turbo and you may get 800cfm at only 10 psi.
this would make more power. at a lower boost.
the draw back is more lag.
numbers are just examples, so all nitpickers go screw off.
Thats not really looking at the big picture though. If the motor can only injest 500cfm then having a turbo that moves 800cfm at ANY boost level won't do anything. It will either raise boost (remember boost is just resistence to flow) or the wastegate will maintain boost and your new super wombat 800 cfm turbo will still only flow 500cfm (cause thats all the motor can take in).
But you might say "yes, but since its more efficient, it will be a cooler 10psi with the bigger turbo". But I'll say "heat is a byproduct of compression. 10psi from a tiny turbo vs 10psi from a huge turbo would have the same discharge temp, because they both are squeezing the air the same amount".
I don't have all the answers, but I've been thinking about this for a long time. Someone please enlighten me.