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?

[lagos]

People have installed helper springs on the waste gate to allow the turbo to hold high boost like that, so technically you can do it.
The only problem is that this is a bit too much for pump gas and the stock timing map to handle. You can add methanol injection, but you might need more of it than you realize to combat detonation at that boost level.
To do this safely, you would need something like a J&S Safeguard to monitor knock as you experiment with boost and methanol amounts.