CT20 turbo overboost Options

[Island_Racer]

How capable are these turbos at surviving pressure above 18psi. Ive heard "hot air" etc...but i have a water injection system....i can clamp the signal and tune beyond the 18psi fuel cut but what other than hot air should i be concerned about? and do you think the water injection can cover that?

[Smaay]

sure the turbo had less restriction allowing for more boost to be made, however at 20psi the turbo isnt efficient. Like you said in the first post, its just pushing hot air. I cant think of a metaphor to relate it to.

lets say you take 10psi through a small turbo its moving X amount of CFM. then you install a large turbo and boost the same 10psi. its going to be moving Y amount CFM. another example is water flowing through a straw and a garden hose. both at 10spi but the hose is moving much more volume. So when you beyond the efficiency range. its the same amount of volume in the garden hose but now its flowing through a larger pipe. there is wasted air in that volume.