from this last post, the implication is that revising the air input stream is
useless unless you are running hi rpm. i may misunderstand you, but
when i added the K&N air injection, there was no missing the performance boost.

also, i note that all the new 5.4L's are boasting the 75mm throttle size,
funny if they cant make use of it. i guess ford design has no science?!
(pls take no offence, i am just kidding around)

just kidding, i did want to point this out though.

a query on padron's comment, this efan, there must be more to the picture than
more water cooling power that translate to a performance boost? are you also
yanking the oem fan when you add the efan?

thx...

 

Yes you remove the stock clutch fan which removes parasitic loss and weight.
I believe the stock TB on the 2001 is ~70mm so a 75 will not gain you much at all.

 

hi norm,

first, thx for the clarification on the efan thing. i suspected as much.
i drove a 77 bmw 320i for 20 yrs and did the equivalent change to it.
certainly, there was a huge boost for that mod.

but the downside was the thermostatic switch didnt really kick in at a low enough
temp so i had to add a manual override as if i came to stopped traffic(damn
common hereabouts), i had to kick in the fan manually to keep the temp
under control.

as a younger hotrod guy, this was cool. but as the usage became more
mundane in time, this became an onerous change for a daily driver.

i like coming to a traffic jam now and the stock setup can idle all day long and
never overheat. until this truck becomes a beater, this is probly more
mod that i am willing to take on.

you have an important point that i wanted to clarify, you said the oem
diameter is ~70mm. from that 75 isnt much additional.

one other gentleman suggested the oem diameter was low 60mm, can you
point me to where i can confirm my starting size? low 60 to 75 is a good update,
but 70 -> 75 isnt worth the cost for sure...

thx!

 

.. and as for this:

You didn't heed what Bluegrass was saying about base capacity. The new 5.4L 3V simply breathes better hence it can accomodate a larger TB ...

At the risk of ad nauseum, please learn to search for your efan questions - there are hundreds of posts on that topic AND a lot of passion

Cheers
Grog

 

This is what happenes on these boards. The people get all rapped up in words and advertisements and throw out the science.
Example. 5L engine can't draw more than about 500 cfm at 6000 rpm.
Subtract flow losses thu the intake tract in total and you lose close to 20% of airflow. The cam profile also has a great effect on airflow totals.
Putting a larger throttle body on won't make the flow better provideing the original TB was large enough. Same goes for the air filter and intake system.
You cannot change or negate physics.
Increase the displacment, port the heads, improve the intake manifold then you can flow match to get more power. This is why the 5.4 could use a larger TB.
It is indeed a matter of air passing thru the engine but one change, when the total flow ability is limited at some point in the path, won't correct the problem by making the change at some other point.

 

folks like yourself that can dispell myth from hype for those like myself with
less experience is a great way not avoid wasting money on directions that cant work...

thx very much for your time to share this info...