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In back to back testing I have been involved in we found a proper Timken taper bearing performed far better during cornering. The tapered bearing gave far better steering response and better exit speeds. I have a theory that ACB's were developed in response to a call for lower bearing friction in a straight line for fuel economy purposes and going around corners efficiently got binned as a primary objective. Ask any Subaru WRX owner how long they last in track competition, not long is the answer. It has never ceased to amaze me as to why they are used in competition at all. Mind you I am not a bearing engineer only passing on what I have found in our racing environment. I would be interested to see if anyone has back to back tested the two types and their findings.
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