JusMX141
Moderator
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- 1,269
- Dec 13, 2005
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Greensburg,
Pennsylvania
Holset billet and cast HX40 wheels are identical in shape and design...the billet is made only to be stronger against wear and breakage in extremely dirty conditions or under very high boost levels. In other words, the durability means it could be machined thinner, but Holset kept the wheels the same size and shape for consistency.
Because billet is more dense with less air pockets in the material than cast, it's likely the the billet HX40 wheel is actually heavier than the cast wheel of identical size; but the weight gain is so minimal on a turbo of that size that you'd never notice a difference in back-to-back testing.
Because billet is more dense with less air pockets in the material than cast, it's likely the the billet HX40 wheel is actually heavier than the cast wheel of identical size; but the weight gain is so minimal on a turbo of that size that you'd never notice a difference in back-to-back testing.