Quote:
Originally Posted by Old Mechanic
I am assuming it is some method of modification of the throttle body area of the induction system. If that assumption is correct then it should be reversible (swap throttle bodies) and therefore any benefit could be documented.
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Apparently, the idea is to allow air to somehow travel around the throttle plate with reduced restriction, therefore reduced pumping loss past the plate. The idea itself sounds possible in theory, but I severely doubt that this modification results in a 20% or more fuel economy gain.
There's also the matter of the increased airflow around the throttle plate. How are you supposed to control engine output with this larger-than normal opening around the throttle plate?