Modification of OEM Air Box

[Jerry Bransford]

Ok. Some of you need some basic manners. Seriously. Attached is a photo of what I did. All I can say is that driving the TJ with same barometric pressure, same air temperature, humidity, and same fuel,..... with this modification, my TJ doesn't seem to bog down at 1500 rpm and it now maintains 90 MPH on the highway. Before the modification, I had the peddle to the floor (literally) to hold 78 MPH. So,..it is what it is.
Cheers View attachment 280291

Your performance issues are not being caused by the factory air intake system. The factory intake is proven and well known to be able to easily flow far more air than the engine can consume at WOT and redline rpms. It was specifically designed to be completely non-restrictive, which is not true with all factory air intakes. I heard that personally during a phone conversation with Jim Repp, now retired but who was Jeep's senior most engineer when the TJ was introduced. He is also known as the "father" of the TJ Rubicon introduced in 2003.

 

[chimmike]

Ok. Some of you need some basic manners. Seriously. Attached is a photo of what I did. All I can say is that driving the TJ with same barometric pressure, same air temperature, humidity, and same fuel,..... with this modification, my TJ doesn't seem to bog down at 1500 rpm and it now maintains 90 MPH on the highway. Before the modification, I had the peddle to the floor (literally) to hold 78 MPH. So,..it is what it is.
Cheers View attachment 280291

To concur with Jerry, the air intake isn't your performance issue. Furthermore, there's no way in blue hell your modification could help an aerodynamic brick of a wrangler overcome physics such that it could top out 12mph faster. The amount of horsepower required to do that is more than an intake of any sort can provide you. Thinking that makes clear a lack of understanding of the relationship between horsepower and miles per hour. Or how difficult it is to make n/a horsepower.

 

[FarFire70]

Next upgrade:

 

[deadbeat son]

 

[1904-06LJR]

Ok. Some of you need some basic manners. Seriously. Attached is a photo of what I did. All I can say is that driving the TJ with same barometric pressure, same air temperature, humidity, and same fuel,..... with this modification, my TJ doesn't seem to bog down at 1500 rpm and it now maintains 90 MPH on the highway. Before the modification, I had the peddle to the floor (literally) to hold 78 MPH. So,..it is what it is.
Cheers View attachment 280291

 

[Lou]

Ok. Some of you need some basic manners. Seriously. Attached is a photo of what I did. All I can say is that driving the TJ with same barometric pressure, same air temperature, humidity, and same fuel,..... with this modification, my TJ doesn't seem to bog down at 1500 rpm and it now maintains 90 MPH on the highway. Before the modification, I had the peddle to the floor (literally) to hold 78 MPH. So,..it is what it is.
Cheers View attachment 280291

Why even zip tie the air filter to the lid? If you’re going to do that just remove the intake pipe off the throttle body. Maybe she will break 100 mph too!

 

[P man]

Don't listen to these guys they are a bunch of jealous jerks...get a throttle body spacer put on there and it will literally put you back in your seat

 

[williambmac]

Why not just remove the whole box and tube assembly. Then install one of these directly on the throttle body. This way the air has a direct unobstructed route into the throttle body. Plus….. it’s a K&N so it will flow much better.


https://www.knfilters.com/rc-1060-universal-clamp-on-air-filter

 

[tr21triton]

Next upgrade:

View attachment 280295

hey thats the same supercharger i have on my 4.0 . now that damn upshift indicator never turns off. i had a hell of a time trying to get the throttle cables connected and timed so it would open the throttle on the blower at the same time as engine, but now a viper aint got a chance when we line up ! i can hold 130 mph even uphill !

 

[Brianj5600]

Hook up a scanner and watch MAP stock vs modified.

 

[Cornbread]

I give that 4.0 10,000 miles before it needs an engine rebuild with that filter set up.

 

[mrblaine]

I give that 4.0 10,000 miles before it needs an engine rebuild with that filter set up.

Why is that?

 

[Cornbread]

Why is that?

Not enough zip ties

 

[mrblaine]

Not enough zip ties

Which does what?

 

[williambmac]

Which does what?

Properly seals the air filter to the lid so no dirt can get in.

 

[TheBoogieman]

I opted for a "proven" and verified method.

 

[mrblaine]

Properly seals the air filter to the lid so no dirt can get in.

And if some dirt of some level did happen to make its way into the intake, then what? How does that take out a motor in 10,000 miles?

 

[thekidwithquestions]

Ok. Some of you need some basic manners. Seriously. Attached is a photo of what I did. All I can say is that driving the TJ with same barometric pressure, same air temperature, humidity, and same fuel,..... with this modification, my TJ doesn't seem to bog down at 1500 rpm and it now maintains 90 MPH on the highway. Before the modification, I had the peddle to the floor (literally) to hold 78 MPH. So,..it is what it is.
Cheers View attachment 280291

if you REALLY wanna go fast add some 25" fuel rims,
they cut down on wind resistance

 

[Cornbread]

Which does what?

Instead of the filter being sealed all the way around the perimeter by a consistent force, he is relying on zip ties which would act more like point loads.

 

[mrblaine]

Instead of the filter being sealed all the way around the perimeter by a consistent force, he is relying on zip ties which would act more like point loads.

I got that part. So what?