Topic: Intake for an XJ

[ChuckC806]

Anyone know if there's anyone that makes an intake for an 4banger '99 XJ?  I've seen some for the 4.0l and some for the 2.5l wranglers, but not for the XJ.  Will the one for the 4.0l fit the 2.5l also?  Or am I better off going custom?

[Jeffy]

Safari Snorkel is the one thing I've seen.  Problem with the XJ is that it's stuffed pretty tight so a CIA isn't really going to work well.

[ChuckC806]

been thinking about doing something similar to the cowl intake system that i saw posted on here somewhere, but instead, place a mini-scoop on the hood, and then the rest would be similar.

[ChuckC806]

Since we're talking about the air intake.  Can anyone tell me what the hell that little "black box" is attached to the intake tube and sits right above the throttle body?  Been searching all over and can't find out what it is.

[Jeffy]

Since we're talking about the air intake.  Can anyone tell me what the hell that little "black box" is attached to the intake tube and sits right above the throttle body?  Been searching all over and can't find out what it is.

I don't have any pictures but I'm going to guess it's an expansion chamber to help slow the air speed down.  Supposedly, it's to quiet any noise like whistles and the vacuum sound.

[dwtaylorpdx]

It quiets the intake down and allows the air pulses to smooth out..

The Honda S2000 has one of these thats highly developed and it
accounts for a serious amount of the engines horsepower for an intake system...

Dave

[ChuckC806]

I don't have any pictures but I'm going to guess it's an expansion chamber to help slow the air speed down.  Supposedly, it's to quiet any noise like whistles and the vacuum sound.

here's a pic of it.  if i were to put an intake in, is it necessary?

It quiets the intake down and allows the air pulses to smooth out..

The Honda S2000 has one of these thats highly developed and it
accounts for a serious amount of the engines horsepower for an intake system...

Dave

dave, when you say it accounts for a serious amount of the engines horsepowere, is that a good thing or bad?

[chardrc]

i would cut that cancerous tumor off the intake (lol). i doubt jeep took the time to design it to add hp like the honda one that someone spoke of earlier.. (but i could be worng)

[Jeffy]

Is the rear fresh air vent connected to the box?  I don't see any lines going forward from behind the box.

[dwtaylorpdx]

here's a pic of it.  if i were to put an intake in, is it necessary?

dave, when you say it accounts for a serious amount of the engines horsepowere, is that a good thing or bad?

On a S2000 its very very good... On a Jeep? who knows...LOL

Dave

[ChuckC806]

Is the rear fresh air vent connected to the box?  I don't see any lines going forward from behind the box.

nope, there's nothing connected to it.  it feeds into the "box" on the top and then underneath, it feeds right back into the intake tube just above the throttle body.  that's why i can't figure out what the hell it's there for

[Jeffy]

I'm betting it's for sound rather then any perfromance.  You could swap the elbow for a standard one but then you would need to run the vent line to the airbox.

[ChuckC806]

If I'm correct, the vent is just below the driver's side windshield wiper on the cowl.  Or at least that's what I'm led to believe because it's got holes on that side of the cowl, but it's just the opposite on the passage side cowl.

However, from what you're saying, assuming you're correct, I could add an intake tube, and then run an "excess" vent line from the tube near the throttle body back to the air box and it would basically do the same job.  Right?

[95yjman]

I run this on my cherokee, ya its on a 4.0 Liter but I have the exact same one on the 2.5L in the YJ

[ChuckC806]

after pulling the intake apart, the intake tube doesn't even feed into it at the top, it's capped off.  so i'm thinking it's just to hold air, like an expansion chamber, maybe?!