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Billet vs cast compressor wheels

This is a brief discussion on the differences / benefits of cast compressor wheels vs billet, and when to use which. This is a very misleading topic which companies will throw you a sales pitch as to a billet compressor wheel always being a better choice - which is untrue - here is why. Different designs and root diameters together with number of blades, and blade area will obviously affect the weight and performance of any wheel design whether cast of billet, but size for size comparison between a forged material (not an extruded cast material) - the billet wheel will always adversely affect your performance in terms of spool and linear response.