Originally posted by RONIN
ok we aren't going to start on your dedication to all forced induction items being called superchargers, i think that was covered in h/a forum.
no since the centrifugal blower has a direct relation to the crank speed and since the avg 4 cylinder makes no torque of note below 4k, centrifugal blowers have no place on 4 cylinders. as they accelerate the numbers improve esp after you gain enough compressor speed to overcome the parasitic loss of the blower. centrifugals are great on stroker motors that do have low end tq, but lack power in the top end due to incredible piston speed and dwell time... most popular form of supercharging trucks.
a turbo (or as you like to call it... turbine powered supercharger) has a compressor wheel speed relative to the exhaust flow, and can be varied as far as additional manifold pressure by use of a waste gate, essentially aiding in keeping the unit into a better efficiency range.
and don't give me that crap about the drivers not being worth a rats ass, if the car is so great then the numbers wouldn't be off by that much... from multiple sources.
4 clyinders work better with positive displ blowers, which have a greater effect on the low and midrange, but do start to suffer at high speeds.
the numbers i posted are awesome numbers for low boost 200 ftlbs or trq is good or the track i a light car and no its not relative to the rotationof the crank it has a free floating bearing design like a Bicyccle that you can peddalbackwards. Hice why they have bov's the speed doesnt slow down as the engine does but only spins as fast as the crank does proportionatly to the pulley size so 8k rpm could be doubled or tripled to 1800rpm or 27000 rpm most trurbso rusn at 15000 rpm so yes a centrifugal blower does have a place onm 4cyls the only sif differencein the two is the type of drive system the belt style just takjes awa y from the power of the engine overall as teh turbine uses wasted power. so here again its the same thing !