[Christ]

The idea is that even if you're at partial throttle, and have that huge restriction in the way, you're still flowing more air at the same throttle angle, meaning less VE (pumping) loss. Technically, this would give SOME improvement in both HP and MPG.

The fact still stands that a larger throttle body is never a bolt on procedure... you need to portmatch the manifold or you will get LESS airflow overall than the OEM config does, because you're introducing flow reversion at med-high throttle angles (due to the original TB port sized hole in the plenum.)

Reversion is worse than restriction, because restrictions slow down flow, but it's still positive... reversions attempt to "Reverse" flow, which isn't possible, so it creates a large area of turbulence in the flow, thus making the flow's cross sectional area smaller than the OEM config.

I still maintain that without matching the plenum to the TB, that "bolt on" mod will net you a loss of whatever it cost you, and probably less power/mpg as well, if there is any change at all.


ATaylorRacing - did you try just using smooth pipe and the stock airbox/filter? Or even using a smooth pipe w/ the stock airbox and a higher flow filter?

AFAIK, the most restriction present in the intake tract of most vehicles is the filter, second the airbox itself, and third the piping.. smooth piping sometimes helps, but isn't usually necessary. Filters are usually the best single piece to the puzzle.. so maybe a K&N or a Green filter will help out instead of hurting?

Putting a short ram on Granny did nothing but improve high-end HP... I have not noticed a lower MPG or less seat-of-the-pants torque at all, and the filter is right behind the radiator's flow path on the cooling fan side.