Originally posted by Big Jim:
Originally posted by warmonger:
Originally posted by Big Jim:
In the roughest of terms, the 3.0 has 20% more displacement than a 2.5. Assuming that it can use 20% more air, the math would be simple. A throttle body with 20% more area would be between 65 and 66 mm.
With a hotter cam, head porting, larger exhaust, and no restriction from the MAF, a larger throttle body may be more optimal.
With stock exhaust, milder cams, etc, a smaller throttle body may be optimal.
Other factors may also change the results.
As I started to say, in the simplest of terms, a 65 mm throttle body would be a good place to start with a 3.0 with SVT cams. With Escape cams, the 60 mm would be a good palce to start.
You would need a set of cams hotter than the SVT cams to even thk about a 70 mm throttle body.
My $.02.
You mean like a 3L turbo capable of swallowing 500 cubic feet per minute...if not a bit more 7-8psi? 
I'm not sure. Remember that with forced induction the boost is in front of the throttle body. It certainly does add another dimension to tuning though.
Yeah, I understand what you are hinting at, but believe me, I'm sure. It makes a noticeable enough difference in just seat of the pants feel when jumping from 60 to 70mm with a turbo that it can't be a bad thing.
By the way I meant to say that 500+ cfm AT 7-8psi, it can pull closer to 700cfm at higher boost.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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