I've been restoring this over the past three years. It is a 1998 NASCAR edition F-150. I owned it, sold it and bought it back in rough condition with 200 K on the odometer. There were only 3000 made for the 50th anniversary of NASCAR.
It's got a new 4.6L engine and automatic.
I installed a 3" exhaust, CAI and a 75mm Throttle body.
I've added a 93 Octane performance tune using my SCT X3 unit. On top of the canned tune the unit allows for some engine / transmission adjustments. I increased the line pressure to the tranny and I increased the WOT timing by 2 degrees without any pinging. These made a marked improvement in performance.
Another of the engine adjustments allows for up to 15% increase in WOT air/fuel.
So here's the question.
The stock throttle body was 68MM, the new one is 75MM. That's pretty close to a 10% increase. Would that equate to a 10% increase in the WOT air/fuel or are there other factors I'm not aware of?
[This message has been edited by RayOtton (edited 11-03-2016).]