Originally Posted by jetlude
I saw it as high as 1800F. Too high huh?
Before the turbo right? That's almost 1000C. I'd say that's right at the limit where you could start degrading the turbo and, manifold, etc. I am assuming you've got a divided turbo manifold so that is going to keep most/all of the exhaust gases from flowing back into the engine. It's not like you're worried about cat life so that's not an issue.
I'd say if you left it alone now it should be plenty safe as long as your water injection doesn't fail. You would really have to see what happens when you advance the timing say 2 or 3 degrees at the highest boost levels. Pre turbo injection can help extend the knock limit, but there's only so much experimentation you can do with basic road tuning or chassis dyno tuning. How much do you want to risk knocking just to see what happens?
If it were me in your shoes, I would leave it as-is.