We have a winner

 

to me you truck is "new". But I still think Brian Johnson is the new singer of AC/DC. And Neal Peart is the new drummer for Rush.

 

 

To be perfectly clear, I DO NOT wish to get in a urination competition with anyone in this forum, but I have some questions with regards to the argument that the current generation of Power Strokes are such highly-tuned and exacting-in-tolerance vehicles and that a modification to the CAI is doomed to failure and/or a waste of money. Again, it is not my intent to call anyone out, as I am the first to admit my own ignorance. But, what I am not following in this argument is how a factory intake, which to my knowledge has no moving parts or adjustments being made by the truck's computer within the confines of what is being discussed regarding a swap-out, account for the difference in air density and oxygen content at sea-level, 90F, & 95% humidity versus 6000ft elevation, 20F, and 5% humidity. From my point of ignorance, a CAI that increases airflow would be beneficial in the latter example. What aspect of the 6.7's performance/operation am I missing that makes that assertion to be false?

 

Density altitude is compensated for by regulating turbo boost. The intake system monitors air temp and air mass so it has a pretty good idea about the density of the air going in. This is a pretty universal method with OEMs where boost is involved, not just Ford. As was mentioned above, this is why many modifications are without a positive result unless you use a tune to unlock torque management.

I would also like to add there is a scientific method to determine how restrictive your intake system may be. All you have to do is shove a 1/8" nylon tube in the intake pipe roughly half way between the air box and the turbo. Put a vacuum gauge on the line and read engine vacuum. To get a good indication, you would drive the vehicle to where you can put a load on the engine and lock out the trans. Floor it from torque peak to horsepower peak and observe the vacuum gauge (actually, unless you can data log, it would be better to have a co-pilot monitor the vacuum gauge). A system operating with zero restriction would show 0"hg. There aren't many systems not bred for the track where you would see zero. After all, the air filter itself is going to pull some vacuum in the tube ahead of the turbo. You start seeing restriction at around 3"hg. I'd like to tell you at what measurement you would be looking at some modifications but I don't have diesel performance expertise. But, again, if the system is allowing the turbo to deliver full boost at a density altitude, then having more or denser air available isn't going to pass the turbo.

 

Exactly why I asked my question Wrvond.

 

 

 

[QUOTE=C12H24;18322908]Density altitude is compensated for by regulating turbo boost. The intake system monitors air temp and air mass so it has a pretty good idea about the density of the air going in. This is a pretty universal method with OEMs where boost is involved, not just Ford. As was mentioned above, this is why many modifications are without a positive result unless you use a tune to unlock torque management.

Thank you for the explanation. It now makes sense to me.

 

I should add that as diesels are throttled by fuel, the torque management strategy may include or be exclusive to the fuel management side. Meaning that even if there is more air available, the computer would or could trim fuel.

 

Sensitive much. Stop being a snowflake cause I called someone a name. I bet you were the kid that snitched on everyone weren't you.

And you're response wasn't childish? And sorry you don't like my opinion, I only speak the truth. So I'm sorry you didn't like my truthful childish response since you didn't know the facts.

 

I don't know the finer details of how incoming air is processed in a diesel. In my prior half ton N/A gas truck, a CAI seemed to help some, but the overall effect was limited by the size of the throttle body which became the choke point once the intake filter, box and tube were opened up. The throttle body was drive-by-wire so the computer could easily limit the amount of air going into the intake manifold simply by closing the butterfly valve on the throttle body.

From the verbiage posted earlier in the thread by the aftermarket manufacturer, it wasn't clear to me if the HP/TQ gains were with or without a tune.

 

Umm you still haven't posted a link to your screen shot.