Thanks for giving a good discription of TC/Sces MLD.
I think the main reason that most V8s havn't used SCes is because they don't need to.
For example, the 2003-2004 SVT Cobra Mustangs made 390 HP out of a 4.6L DOHC.
Caddilac is now making a supercharged Northstar engine, its a 4.4L making 469HP.
Mercedes Benz has been making strong numbers with "kompressors" since god knows when.
For the general buying public high horsepower numbers just arn't needed.
Both the Cobra, and STS/XLRVs of Caddilac are made in limited production.
Turbos do require more maintenance, and care to be put into your driving habits. Depending on the turbo, it can have little to no lag at all, or you may not be making your power untill 1/2 way through a gear...I know many a Supra don't make peak power untill 4-5000 RPM.
Because of that Superchargers have generall been more often applied to V8s because they compliment the low end power better, and are easier to drive. If you were to take the Northstar engine, and change it to a Turbocharger isntead of a supercharger, it would probably push the power up to around 500-520. But on a 65-70 thosand dollar car, a person doesn't want to have to let their car idle to cool the turbos.
That being said, there are a good number of cars that DO use them. Audi/Volkswagon use them. Audio made a BADASS car back in 2000 I think called the RS6, which had a twin turboed 4.2L V8 making 450HP or so. It was a good performing car, but also was a big sedan so it took out some of the performance. Mercedes makes a couple of turbo V12s in their AMG cars, but those are another story.
I think it boils down power, the turbochargers extra power provided just doesn't outweigh the advantages a supercharger gives on a V8, mainly in driveability. (From a manufactorer that is, these can be solved in the aftermarket).
As for the imports, the have benefitted more from a turbocharger because instead of larger displacment engines, they use higher reving smaller engines. As MLDavis said, a supercharger uses power to make power, and the faster a engine revs the faster it has to turn the supercharger, meaning the higher a small engine revs, the more power is sucked from it, and the less power the supercharger gives to it overall. This is why a turbocharger is usually better on a smaller displacement engine, because the supercharger doesn't have the advantage it has for a larger engine that doesn't have to rev as high. In the high revs it draws to much power to be a big advantage, and since smaller engines have a peaky powerband anyways, the turbo can actually comliment the engine perfectly with simply increasing the power, and not altering the powerband that much.
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