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I have seen bigger Throttle Body's in the Ford F150 forums and wondered if anyone has had experience with this on the Gen 6 3.5 engines. I know that bigger is not always better unless complimented by other changes i.e., tune, intake port, exhaust. I see that Stage3Motorsports has a 73mm BBK TB for the 3.5 and 3.7 but don't know if it's appropriate. Also I am kind of wary of the spacers as more "snake oil" unless someone has done any good, objective dyno tests with these.
 

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That's one thing I debated on doing at one point was a larger throttle body. However, the issue with that is figuring out a solution to allow the intake manifold and intake tube to take in this extra airflow. The amount of air moving from one point to another will always be restricted by the smallest point. So really, it doesn't matter how big the throttle body is if the intake tube, being next in the flow sequence, doesn't even have the physical room to cram all that air through.


I've cleaned and ported my upper and lower intake manifolds and that made a noticeable difference. It doesn't add airflow, it smooths the flow and removes choking points, seams, and misruns. I noticed the car idles a bit smoother, but the pedal response and acceleration is muuuuch better.
 

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I was watching MotorWeek show last Saturday and they were looking at the new Mustang Bullet. They made a comment that a larger throttle body was added increasing horsepower by 20 hp. My 2006 Taurus has a larger TB than my 2001 on a OHV.
 

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They made a comment that a larger throttle body was added increasing horsepower by 20 hp.
The bullitt received an entirely new intake manifold/TB combo based on the GT350 manifold/TB.


Typically TB's and manifolds are tuned to deliver a specific air velocity to each cylinder to fill it to max potential. Making an change here can have implications in how well this is done. Larger TB's do allow for more airflow, but they potentially can slow down air velocity depending on manifold design. This can affect horsepower, and torque curves.

I'd recommend to throw out the notion that bigger = power and think about how the entire intake system works to fill the cylinders. Cam timing events also play a huge roll here in how the cylinder is filled. SO you can't take results from one vehicle/engine and apply the same logic to other unrelated vehicle/engines.
 
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