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Originally Posted by dayofpain
yes the compression from a super raises temperature but nothing like a turbo. obviously. all the centrifugal superchargers i have felt you can touch the housing because they dont get very hot. roots blowers get alot hotter.
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I think it just all depends on the particulars of the TC or SC setup. A centrifugal supercharger and centrifugal turbocharger both just have impellers in the intake airstream, they're just air pumps. Theoretically if they're the same diameter, blade count, and shape impeller and spun at the same speed, they should both impart the same amount of work into the system, hence the same amount of heat. With the two systems doing the same amount of work (pressurization/boost), the only extra heat I could see in a real turbo setup in an engine bay would be some heat conducted through the turbo casing and shaft from the hot exhaust side of the shaft. I bet if you stuck an air temperature gauge in the intake tube downstream of a similar SC and TC the temps would be similar. Different impeller setups pushing different amount of boost could be quite different. SC guys usually have lots of detonation problems because they don't inter/after cool the compressed air... their intake air temps are real hot and they try to compensate by just adding lots of fuel to make the mixture real rich and tuning the spark timing.. which works so-so.