Bullet (Australia) Supercharger?

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Sep 4, 2008 | 06:21 PM

#76

jcat_350

Lexus Champion

Joined: May 2008

Posts: 3,347

Likes: 6

From: RI

Quote:

Originally Posted by GS FONZy

what about it

you lower your compression. Do you know why you are asking this question?

you lower the compression so that the engine can handle more boost without detonation problems.

just thought i'd help the fellow out

Sep 4, 2008 | 06:34 PM

#77

twizted

Instructor

iTrader: (2)

Joined: Nov 2004

Posts: 1,139

Likes: 3

From: Florida

Quote:

Originally Posted by jcat_GS3

dont forget the loss of efficiency with the roots blower. The centrifugal blowers (IE RMM, vortech, etc.) have a much lower coefficient of parasitic drag on them (meaning it takes less of the engine's crank hp to spin the charger) than a roots type setup. The reason for this is that a centrifugal supercharger only has a turbine wheel, similar to that of a turbo. its a direct 1:1 from the drive belt to spinning the shaft of the blower. With a roots blower, the drive belt runs on a pulley, which spins a shaft, which turns a gear, which in turn spins 2 other gears, which spin two screw shafts. You can see just by the number of stop offs how much different the two systems are.

Both kits have there positives, you have to remember the twin screw is also more efficient then the roots rotors...

Sep 4, 2008 | 06:44 PM

#78

ScottURnot

Lexus Test Driver

iTrader: (33)

Joined: Jul 2004

Posts: 5,827

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From: Sideways on the Yellow Brick Road! < Thats KS!

a centrifiical is not a 1:1 drive either. There has to be some gear change to get it to spin at those speeds. Maybe I wrong, any pro's?
Twin screw is my choice between Roots, centrifical and twin screw.