The turbocharger CHRA is a complex piece of machinery which has been designed to operate at temperatures up to 800°C whilst reaching rotational speeds in excess of 230,000rpm (that’s over 3,800 revolutions per second!).
Only the VSR machine measures imbalance to the speeds necessary to be an effective test, If this balancing process is not carried out, the result can be a turbo which will be noisy in operation and is very likely to suffer failure prematurely.