Ok, here's my question. In a turbo charged application, which is safer (less wear inducing) on the engine, assuming both scenario's make the SAME RWHP. 25 degrees of timing, and 5 lbs of boost, or 10 degrees of timing, and 8 lbs of boost?

A real world scenario might look something like this:

Joe LS1 own's a LS1 power'd F-body. He's got a turbotech single turbo kit for it. Joe's TA is his daily driver, so it needs to be as reliable as possible. Joe's goal is to achieve 450 RWHP, as SAFELY as possible. Joe has discover'd that 5 psi with stock timing (about 25 degrees) will create his desired HP level. He also knows that the car will make 450 RWHP with 12 degrees of timing and 7 psi. Which way should Joe go?

Did he gain anything by moving the combustion event further along the 4 stroke cycle?

Thanks!

 

You are more likely to get a response to this on the "Forced Induction" board.... moving it there.