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Originally Posted by -Jayson-
B for a few reasons
Turbos abuse the oil, this means you need more frequent oil changes and if you dont can cause problems. Turbos also generate alot more heat, from the turbo manifold, all that heat can get soaked into the engine. Also with a turbo you run the risk of accidentally over boosting. You will never have that problem with a supercharger.
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Abuse the oil?
Generate more heat?
Overboosting?
Never have any of those problems with a supercharger?
Define abusing oil.... It cools and lubricates the turbocharger. Kinda the same thing it does for your engine. More frequent oil changes are not needed. Every 3000 miles or 3 months is just fine. If you do a lot of racing, sooner is better. But that has nothing to do with turbocharged or not. Any car should follow that guideline, turbocharged, supercharged, nitrous, NA, stock, whatever.
Generates more heat.... Well actually the exhaust heat causes zero temp rise to the intake charge. The air is actually in the compressor about the time it takes for you to blink. Prolly less. Similar to you touchign a hot grill really quick. All of the heat is generated by compressing the air. Efficiency is a degree of temp rise. Less efficiency=more heat created. It is an exact percentage. Pressurizing air creates heat no matter what(or any fluid for that matter). It is a constant. Now whatever the temp rise is on what boost you are running, divide it by the percentage of efficiency of your compressor. Now that is the outlet temp. And roots blowers lose while centrifugal superchargers are roughly the same as a turbocharger except they don't have the unused energy efficiency factor. Besides, no more heat is "created" by the turbo. It doesn't make heat. It uses heat as energy. EGT isn't any higher when making more power. Things like AF ratio, timing, cylinder port/head design decide EGT. All extra heat created by making more power usually goes into powering the engine since it is a form of energy.
Overboosting.... Not a problem if you set your car up right.
Never have any of those problems with a supercharger.... Seems like you guys have a huge problem with heat
Truth be told, too many factors to decide which puts more stress on an engine. Stress would be a direct factor of torque curve vs displacement since torque is directly related to Peak Cylinder Pressure. Cylinder pressure=stress.