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韵儿 发表于 2012-10-23 23:07 
Oh I see! Factory one bored out to 70mm?
Spoon TB for DC5 is using Venturi design.
Inlet, bore to 70mm.
then taper to the butterfly (I think that is the same as stock, 62mm but I could be wrong).
Outlet bore to ~65mm (not exactly sure about diameter but opening is bigger than stock).
There are other TB that is straight 70mm or even bigger.
As you know changing TB diameter and intake manifold, changes air speed, will gain in one rev range and lose in another. |
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