ok... well let me put it to you this way... mark had some people at his work crunch some numbers on the optimal size for a 2.5L duratec engine with the vortech supercharger. They said optimal size would be 73mm. You are telling me the only differene between the optimal size for a forced induction engine and a n/a engine is 3mm? I highly doubt that. All i am saying is that i am sure roush did not just pick 60mm out of a hat, or the parts bin for that matter. Just like nearly every other part designed for the svt contour research was done... all i have heard from the people that have done this mod is "it feels faster" no before and after dyno plots, not real information to back it up. i am not saying this is 100% not going to make an improvement, but the smart money is on something more like 63 or 65mm tb, even then i would have to see before/after plots before i was convinced. If someone is willing to send me the 70mm/65mm/63mm tb (any or all) i will glady have them put on the dyno and then return them. Also unless you have some knowledge of flow dynamics (or whatever is necessary to full understand the effects of adding a larger tb) i really don't want to argue about this because neither one of us will be able to provide any solid proof regaurding this.
also you keep saying $$$ is the bottom line... well wouldn't it be cheaper not to offer an svt vehicle at all or any model variations? why even offer options... money is not ALWAYS the bottom line, but it is definatly a pretty big factor. i just don't see why roush would do some of the things it did (more costly then a larger tb) that yeilded small returns... ( < 5 hp at the crank )
