First of all, a centrifugal supercharger doesn't have *lag*, just because it has dynamic compression the pressure is proportional to the the speed of the compressor, which is driven by the crankshaft. So at lower rpm's, it doesn't run as much boost as at higher rpm's. So no, it doesn't technically have *lag*, you just feel it more the higher the engine revs.
I was just mentioning a centrifugal s/c because I am pretty sure the s/c for the Scion tC is centrifugal, and seeing as that Scion is owned by Toyota and uses Toyota engines, the s/c would probably be pretty close to fitting. If I remember, the engine is an "S" series in the tC.
I would look into Roots or Lysholm Screw type superchargers also. Like I said earlier, low-end torque is what I am going for.
EDIT: The engine in the tC is the "AZ" series, which replaced the "S" series. My bad.
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Originally Posted by Don't Worry, It's Just Me
yea, it' helped me realize just how bad i DIDN'T want to supercharge my 5S.
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Since the site is down, would you care to elaborate?