I'm the proud owner of a 2009 Mustang V6. I've been upgrading it every couple of months. I figure giving it time to settle and the KAM to adjust itself.
I started out with a BBK CAI which really helped the engine to breath and I noticed the increase of the performance. At the time, I had no real way of tracking such... except my personal Butt Dyno.
Two weeks ago I installed a BBK 70mm Throttle Body and intake spacer. I had several issues with installing it, the prior owner did not have the original bolts and thus gave me an "MML" 1/2 inch spacer with bolts. No gasket. Once I installed them and took a few trips around the block I heard the whistle. At the time I did not know it was the "The infamous BBK whistle". Thinking it was a leak with lack of a gasket. I used RTV silicone sealant to make a new gasket between the spacer and the TB. Here's where I'm hitting issues but this time, I have a means to record some data.
I'm noticing that my Fuel Long Trims when idling are 15 and 14. While the Short Terms and instantaneous avg out to zero (rough sin wave).
When I accelerate hard, the first change is the engine load.. when it first peaks out the the Long Terms jump up to low twenties while the short terms and instantaneous work their way up.
What I'm noticing is the lag in power... There is a hesitation when I step on the pedal before the car really starts to pick up speed.
I know that to fully use the CAI and the TB (w/spacer) I will need a tune. What I don't know is if there is anything that I can do between now and when I get a tune to smooth this out.
I'm noticing the more I drive that with the new TB, to get to the power, I've got to down shift and get the RPMs up. When I do this the fuel trims spike up and stay up well past when I throttle down. If I don't "rev up" then the power is not firm and solid. In this "powerless" band, I hear the whistle.
Below is an image of the data.