Quote:
Originally Posted by PulsarBeeerz
Peak number and Tq delivery won't change without port matching the TB the manifold. You have to go beyond just slapping it on. Necking a 72-70mm, which is over kill anyway in my testing down to 66mm isn't going to have the same result as a 68mm port-matched to 68mm. But this will only be effective after throwing on all the usual bolts on. It work on just about every engine as long as the TB inlet is still flared. Straight through ones no matter how larger do not seem to work NA at least.
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If you pour a 1 cubic inch stream of water into a 4 inch diameter pipe, and then increase the pipe to 5 inch diameter, the volume of water and rate of flow will not increase as the restriction isn't the pipe size but the amount of water. its not like pouring too quickly in a funnel and the funnel slowly "fills" up and either spills over or you stop pouring.
The engine can only draw so much air, the TB size is already greater than the amount of air the engine can draw on it's own it is not a restriction hindering flow so going larger will have no effect on maximum power (unless FI) it will only change the throttle mapping up until maximum power because you will have greater airflow going through the butterfly valve of the larger TB at any given throttle position unless remapped to account for this.