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Originally Posted by Capt Fiero Yep the factory TB is a restriction. That is why swapping to the Allante intake is worth 20hp on it.
Think of air like water and boost is like thicker air, and the thicker air is even more sensitive to restriction. |
The Allante intake plenum (uper intake) will also help to cool the charge air because of the large size from what I understand...
And yes, the factory TB is more of a restriction when running more boost. I would think that for stage 1 and 4-6 psi it will be ok, but not for more. That's why I am going to order an Allante intake manifold (upper and lower) to cure any issues there with stage 2.
Dave, when running a higher amount of boost, air is being
forced into the TB unit and beyond. A smaller unit may restrict the air charge, thus limiting the amount that will be fed into the engine in the useable RPM range
and may also damage intake components...
For example, when force-feeding 10 pounds of boost in the under 5000 RPM range, you want all of that 10 psi to be used with nothing left over in the intake tract. This will not only help make power where it needs to be, but it will also keep parts from flying from an over-boosted intake setup. Larger is better indeed!