Topic: ADJUSTABLE MODIFIED STOCK AIR BOX

[stan98tj]

 If you want a little external air pressure in to the intake, get yourself some kind of ram air hood setup; it'll be cleaner.    

i've been saying that since the start of this thread and he hasnt responded as to why he doesnt want to do that.

[quicksand]

The adjustable part is a small sliding plate on the right side of air box, I know its hard to see from pic. I need a better pic of that. It allows more air in or less. Also affects the pressure of the incoming air. It is adjustable by a thumb screw.

[chrisfranklin]

The adjustable part is a small sliding plate on the right side of air box, I know its hard to see from pic. I need a better pic of that. It allows more air in or less. Also affects the pressure of the incoming air. It is adjustable by a thumb screw.

BTW is your TJ a 2.5 4Banger or the later model 2.4L that users a Mass Air Flow sensor? 

[Jeffy]

BTW is your TJ a 2.5 4Banger or the later model 2.4L that users a Mass Air Flow sensor? 

It's a 2.5L.  2.4L's have the big intake and the TB is on the top.

[quicksand]

Thats right 2.5L. Zoom Zoom

[sharpxmen]

The adjustable part is a small sliding plate on the right side of air box, I know its hard to see from pic. I need a better pic of that. It allows more air in or less. Also affects the pressure of the incoming air. It is adjustable by a thumb screw.

why would you want less air? you can always not press the pedal that much (that's how you control the air btw). The mixture is controlled by the O2 sensor in closed loop (so if you give it less air it won't make it richer just have less power) and by a predefined table in open loop - but for that you add fuel, removing air will just choke it so there's less power available. I would suggest reading a little bit about BSFC and how that relates to air admitted in the intake, less air means less fuel that you can burn and such less HP.

not to rain on your parade but other than the cold air from the wheelwell everything else is useless - I can't really tell you though if the air in the wheelwell is hot air from the engine or cold air from outside, but one thing i would be careful with is when you run into deep water or drive thru standing water so it doesn't get sucked in the engine.

[quicksand]

Yes sir, I have been thru about knee high water or higher, slowly with no problem. I do not know exactly as a technical science how this works, but my torque and power is altered just by adjusting the air intake volume and pressure by the air plate.

[quicksand]

Here is a better pic of this small yet so responsive plate

[quicksand]

Silly looking but it works for me.

[FourbangerYJ]

Silly looking but it works for me.

I guess that's all that matters.
When I switched from a rock-it-city air tube with a K&N to a stock TJ set up with a paper filter I did not notice any change in performance.

[sharpxmen]

Yes sir, I have been thru about knee high water or higher, slowly with no problem. I do not know exactly as a technical science how this works, but my torque and power is altered just by adjusting the air intake volume and pressure by the air plate.

but the question remains how did you gathered it changes. I mean don't get me wrong, you will lose power if you choke the intake and if you open it again you will gain it back, if that's what you mean then yes, you're right but that's nothing to adjust (unless for some reason you want less power) - same result if you stick a brick under the pedal and it won't go all the way to the floor, then take it out and your Jeep is flying.

but if it works for you...

[quicksand]

I wish I could let you drive it and feel the difference. Yes If I open it I will take off the line real quick. But at 55 mph I loose torque, which I need to climb quickly to higher speeds. When its closed a little or let me say when I find the sweet spot, she still takes of quick, but has more torque and reaches higher speeds quicker. Even when I am cruising at 60 mph my pedal is less than 1/4 of the way down. Then when I tap on the pedal just a little you feel torque and she quickly climbs to 70, 75mph and holds 70 uphill on a headwind. She will not hold 65mph uphill or headwind if the box is to far open. All I can say its air pressure. Ofcourse sufficeint amount of air also or yes you would lose power. If its to far closed  I but a choke hold on it, then shes bucking not getting enough air. Weird but nice.

[quicksand]

This is about as hard core as I can get right now, my lil rig is a daily driver and the only ride I have. I sold our other 2 trucks so I gotta baby her

[sharpxmen]

your Jeep looks nice though

[stan98tj]

when you talk about opening and closing something, do you mean the holes you made in the airbox? If so, i'm not really understanding why you would have trouble at higher speed with the holes all the way open..wouldn't that allow more air in??? And will you please tell my why it wouldnt have been better (and safer as far as i can see) for you to have just run the air tube up and out of the engine bay like a snorkel?