Pros and cons between turbo and supercharging

ntsqd said

There probably is some parasitic loss to the engine, but for the most part it is driven by the heat in the exhaust that is otherwise just wasted. When you figure that about 1/3 of the total energy in the fuel tank is destined to go out the exhaust pipe, the available

Click to expand...

I looked at a number of turbo forums, searching "exhaust back pressure vs. Boost."

I found that boost that equaled back pressure in the exhaust was a pretty rare thing... only couple of instances. That tells me that the back pressure from the turbo/restriction was probably costing a LOT of horsepower, because some of the examples had boost/back-pressure ratios of 1.5:1 and more. That meant that with 20 pounds of boost, the exhaust valve was opening to an environment of 30 pounds of back pressure (and, more.)

I fail so see how a sizeable horsepower loss could be avoided under those circumstances. I don't think turbocharging is "free" ot anything close to it...

Just my 2-cents...:glasses7: