The pressurization would only happen while in motion forward, unless you do as you said, turbo or supercharge. There is always the redneck system tho, I haven't tried it, but have seen a couple pictures of it. Basically this guy took a 12v, 120mm fan, (cfm was not mentioned) and installed it in the air intake tube to the air box. I don't know if/or how it worked.
I ran across a larger throttle body for the 4.0 OHV that has the throttle linkage on the correct side and has a half inch larger diameter throat, but I'm not sure of the bolt pattern, may have to build an adapter for that. When i figure out which storage I put it in, I'll get a picture and some dimensions posted.
As for the HP - torque gain, that is what this is all about, 2 HP here, 4 there and so on, before long that $30 to $100 outlay gets you 20 or more HP and an unknown torque gain, (hopefully not a loss). Some where in that increase, hopefully you will also increase your mpg. I like the large increases in HP and torque as much as the other guys, but have found over the years that most are quite expensive and a trade off of something else, mostly mpg. Where doing small things one at a time are generally less $ to install, they are less $ to remove, so long as you haven't modified something during the conversion and screwed it up to where you are spending more $ to get it back to where it was originally. You can also spread the small mods out over a longer period of time to see whether that particular job did or did not benefit.
I am fairly sure this is going to be an ongoing topic for a while, and I am anxious to see what others have to say. I think I should have started this thread in the general discussion, as it pertains to all, not just 6 cylinders.
White 2002 Ranger XLT Extended Cab 4.0 4x4 4.10 LS
K&N CAI 77-2529KP
2 1/4" Exhaust
Explorer Dome Light
IN THE WORKS:
Sable Electric Fan
“If you do not know where you are going, every road will get you nowhere.”