Also turbos, operating off exhaust gases, are re-introducing to the motor in some degree what it was originally trying to get rid of. So that means that the unburnt fuel and by-products of combustion are going back through the motor which could be why they can be difficult to tune. Furthermore, even if you can tune it, you still have those gases and all the crud that comes with it going through the piping, intercooler and so forth. Think that aint going to build up after a while? Whereas SC's are taking the already incoming air and just compressing it
Superchargers generate heat as well, its just a fact of the physics involved with forced induction but do so less than a turbo because the SC doesnt use exhaust gases to work. Superchargers are generally much simpler to work on, at least roots styles are, I dont know about the centrifugals.
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this information is not accurate! first off, there is absolutely no reintroduction of exhaust gasses.at all. this is way off. i'm not trying to be an a**, but i want everyone to have correct information. the intake, or compressor side of a turbo is the very similar to a centrifugal supercharger, the difference is that it is driven by another wheel on the same shaft called an exducer or exhaust wheel. the two are seperated by a CHRA . this is a bushing or ball bearing type center section that the shaft rides on, seperating the compressor from the exhaust wheel. both the turbo and supercharger (any type) compress the incoming air. as a rule of thumb, turbos are more efficient than superchargers. they are inherently more efficient. i wiil be happy to provide links to some good reading if anyone would like.
i would also like to point out that a supercharger can and usually does generate more heat transfer to the incoming air. the biggest reason turbos are intercooled more often than superchargers in due to thier design. it's far easier to route the flow of a turbo through a cooling mechanism than a supercharger. as a point of refernce, intercoolers and aftercoolers are essentially the same thing. just named differnt due to the application. they both operate in the same ways.
i hope this helps... Aaron
____________________ 91 galant VR-4 1361/2000
02 black SVT (coming very soon!)
over in britain we had a 1.6 cvh turbo engine as standard in escorts rs turbos and fiesta rs turbos so all we need to do is use the manifolds turbo,ancileries and engine management and put them on the zetec and u have a zetec turbo u cant run high boost on standard pistons and u need to machine down the pistons to get the CR down but they will take about 10 psi of boost we also use zetec bottom ends on the cvh heads u only need to plug up 4 oil feeds to the head on the block and then u have aZvh turbo
