Originally Posted by scorpiont

correct. In the performance segment the billet wheels are advertised as such when they also are of the newest designs. Bw and holset have designed some of the more advanced compressors and manufactured cast wheels with them, but they are still edged out by the billet wheels that can implement a smaller hub. The smaller hub means longer blades, which is equal to more inlet area/higher mass flow capability.




Correct, there is a 61mm cast but no 62mm cast.