In Reply to: Why Turbo versus Supercharger? posted by Bryan on June 08, 1999 at 21:25:07:
1 - Cost $4999 vs $6000+ for the supercharger systems.
2 - Efficency - given.
3 - Questions about durability of the Powerdyne and possibly the Vortech units.
4 - Don't have to change my 7 hp underdrive pulley.
5 - Low boost with good numbers (see #2), resulting in less risks, esp with not so stellar fuel here in Korea.
6 - Relatively simple setup for a turbo. They say that everything is bolt on in 8 hr or less.
7 - This is the one that finally convinced me. The centrifical supercharger units are parasitic until they build enough boost at around 3000-3500 rpms (so I actually lose hp and torque before that) Then the power comes on but with the 2.8's relatively short power range in supercharged mode 3500 - 5500 rpms, it is not as beneficial as it would be in an M with 3500-6500 rpm range. The small variable vane turbo comes on quick because of the variable vanes and its small size. So it should have minimal lag, and I have been told it builds its full boost of 5 psi at 1800 rpms. The dyno graph shows around 250+ ft lbs of torque at the wheels from 2500 rpms to 5500 rpms. The torque curve is never anywhere close to much less lower than the stock curve. Like I said before this thing puts out more max torque and earlier than a Supercharged M.