Contour Enthusiasts Group Archives Forums Modifications Forced Induction price for power???

So does the backpressure that a turbo creates cause more of a reduction in power than a belt/gear driven supercharger that sucks away 15-25 HP? What about your comparison is valid? Any exhaust pipe or muffler also creates some small amount of backpressure.
The only benefit a positive displacement supercharger has over a turbo is the instantaneous boost off idle.
A turbo's advantage is that it is run off the waste energy in the exhaust...the backpressure is no more harmful than your average muffler and yet the turbo yields tremendous gains.

The other thing, what about the comment where "it takes rpms to make exhaust" or something to that effect? Yes it does, but consider what would happen if there was enough exaust to spool the turbo at 2000 rpm? If the turbo is already spooled and at max pressure by the time the engine hits 2000 rpm then anything above that would be extra, or excessive amounts of exhaust that are not needed to spin the turbo. This would result in a turbo that could produce max boost from 2000 rpm and up.
End of story.

It is very difficult to get a centrifugal type blower to produce boost that early/low in the rpm range and still be efficient at higher rpms. The roots type blower yes, but there are other issues with it.
If this isn't clear enough, then I give up.

warmonger