Originally posted by DemonSVT:
Originally posted by tour96se:
been discused before, the "best" tb for n/a svt is 63mm,and n/a duratec is good with 60mm both optimized of course


Really. The "best" is a 63mm.

I disagree. For one; nailing it down to one exact size for any setup combination respectively won't work.

Then:
The SVT intake boot is ~58mm and stock MAF flow area is ~57mm.

An optimized 60mm TB has a 59mm flow area. (it's slightly above 60mm btw)

Without changing things before the TB it is not the most restrictive part. (i.e. if the TB flows 330cfm but the intake only 300cfm then the TB is large enough)

Then while taking that into consideration you also have to look at the heads and manifolds. If those can't support more airflow then the TB can support then the TB is still not the limiting factor...



I'm glad we're seeing different opinions. MY thoughts on this subject....

I agree with Demon that it depends on a number of factors. My non-SVT Duratec "responded" to a straight SVT t-body swap. Then I mildly optimized with another positive "response". Next up was an extreme optimization and another turn for the better. I now have a 65mm converted to SVT linkage/fulcrum waiting to be installed-will it be too big? Hmmm.

Each time I optimized, I took careful measurements so I could calculate the area of airflow. On this point I shall disagree with Demon that an optimized SVT t-body will flow "XX" amount. It all depends on how much of the shaft has been removed/streamlined, whether countersunk or button head screws are used, whether the threaded portion of the screws are cut perfectly flush with the shaft, is the shaft the same thickness from side to side, how thick the plate is, etc.

So we have addressed the quantity of airflow, but how about quality? What affect does it have?

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