snowman, a turbo adds cylinder pressure to the cylinders the same way compression does, so starting off with a high compression ratio to begin with just complicates things that much more. Most any stock engine can run 5 or 6 psi of boost without much issue, as the increase in cylinder pressure really isn't that much of a jump, but its enough to give you that warm fuzzy feeling. But when you start talking about boost levels in the 12-15 psi range, you are basically adding the equivalent of 3-4 compression points or more to the engine in the form of boost pressure, and as Hank and others keep pointing out, your not in Kansas anymore Toto! Everything has now changed from simple and inexpensive, to high end intercoolers and alky mist injection, to premium grade gas or better, high end electronics, $$$$ pistons, etc.... As Harry and others can attest, you can never overspend when building a high boost engine. Many years before you were born and me too, there was a really smart guy that developed much of the concepts that power our nuclear industry. He became well known by also coining many phrases that we can make fit many different scenario's. One that I really like to mention, especially when it fits instances such as this is this. "Insanity....repeating the same thing over and over again expecting different results!" Albert Einstein
