Perhaps. But - the AF1 is no longer in play. And if you'd ask him this again, you'd still get the same answer.

Bottom line:
- some trucks have a factory pre-existing lean condition - 15:1 + in some cases
- you cannot always detect the above (e.g no CEL)
- IF you make changes on such a truck, it risks exacerbating said condition

I think if you ask Bill, those observations were made on vehicles with no pre-existing issues to begin with.

Roulette with your truck? No thanks.

 

Yes, buddy - I understand that. I'm not questioning that you are keeping an open mind. But - barring either Mike or Bill or Justin responding here to answer specifically that, I'd respectfully request that a conversation with any of those folks would offer insight into the 'physics'. It's beyond me as well at that level, but I do trust the empirically derived results.

[For myself, I believe part of the answer lies in the premise that the entire stock intake needs to be considered holistically - as a 'system' - end-to-end. Including the inlet portion. I mean, Ford could have sized it the same as the modded diameter, no? But it's the size it is for a reason, IMHO. It's actually designed to enhance low-end torque ( it's a heevy pig of a truck, lol) again systemically. (Read that here as well somewhere). So - playing with one part could be risky, for some calibrations - Lord knows Ford still managed to pecker some of those... ]

 

Those tests were also done back in 05 when the lean tunes were running rampent. On the 06+ the problem was solved. So on my truck, those tests do not apply to it, but on 04's and 05's it might apply.

 

Also IIRC the lean condition was more prevalent when doing WOT. My truck barely ever goes over 2k rpms

 

Maybe someone should send Bill a formal invite to shed some light on the subject.

 

MGDfan,
PM Jim Allen, he did some flow bench testing on a bunch of different combinations of air intakes and CAI's. He'd probably be more than happy to provide you with some #'s.

 

Already done.