I really think that depends on the setup. Sure 27psi on a low flowing turbo might not break rods, but about 27pis from a turbo than can actually flow a ton of air? What about a turbo that can spool relatively fast and flow a ton of air? I mean, look at all the guys recently posting with stock bottom ends blowing the rods right out of the motor on less boost when they upgrade to something bigger than a ko4. At what point have you seen hardware failures? What in the logs should I have been looking at incase I have missed something?
Maybe you are right, but what else is there to break rods and not show damage elsewhere?
This is one big myth about turbos and flow.
A pressure ratio is a pressure ratio, regardless of turbo.
The only thing with a bigger turbo and bigger hotside is, that there is less backpressure so your VE is somewhat improved and you can run more timing as well because of less backpressure as well as having lower IAT's at the same pressure ratio, but this is negated by w/m injection.
The reason your rods broke is knock, plain and simple. You don't go into high CF's when you're on rod limit, period. You should run 0 CF.
If you look at in-cylinder pressure during normal operation and knock, there's a huge spike during knocking combustion, and this spike is what bends and breaks rods.
