[Global Autosports]

2008 BMW M3 Turbo

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[Nessal]

That is not a turbo.

 

[addertooth]

It is a belt driven, fluid geared centrifugal blower for the boost.

 

[jbs986]

^^^ what he said, and people sometimes wonder why dealing with salesman at car dealerships can be so annoying.

 

[bbs350z]

definitely a supercharger

 

[addertooth]

Nod, I couldn't remember the product name earlier; it is a Comptech unit. It is a common choice for aftermarket boost for many people. A similar kit is used on the Scion FRS too.

 

[Nessal]

Paxton?

 

[tommyc]

Vortech, paxton, and coptech all utilize abelt driven compessor wheel which is similare to the cold side of a turbo. Mustangs have been using for decades. Similar driving characteristics to a turbo. This is not a roots type positive displacement blower. It does add quite a bit of power


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[ageshelin]

re: Centrifugal Superchargers

I always wondered why would someone use this as a supercharger. You get the spool-up problems of a turbo with very few benefits:

+
Lighter that roots or screw-type

More compact than a turbo, easier to mount, no exhaust plumbing

Slightly more linear response, as it it connected to the crank, but a centrifugal compressor is NOT a linear device (needs RPM to build boost)

-
Draws power from crank (less than roots, but more than screw-type for same boost)

Not linear torque curve

The compressor drive has to step up from 5000 to 8000RPM on the motor to 100,000 to 150,000RPM for the compressor (20:1). Hence, known to need maintenance

Anton

Vortech, paxton, and coptech all utilize abelt driven compessor wheel which is similare to the cold side of a turbo. Mustangs have been using for decades. Similar driving characteristics to a turbo. This is not a roots type positive displacement blower. It does add quite a bit of power


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[jasondew]

At least it comes with some sort of investment account. Though it seems odd to sell such an investment for that price. Some sort of credit default swap?

 

[aschen]

Nothing wrong with centrifugal superchargers particularly on cars with decent low end torque

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