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Discussion Starter · #1 ·
ok

i am adding a cat back to my rig and want to improve air flow a bit

i see people all using these "TUBES" but what is the acutal purpose of the tube?

i have an 89 2.5L with the TBI and the air intake comes in horizontally instead of vertically and look like a nice K&N Filter could easily bolt right to that and would cost much less than those "Air Tubes"

why hasnt anyone done this??

am i missing something? does the tube have a purpose i am missing?

thanks
 

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i did it i dont know why nobody has,it works good for me
 

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basically in cars they call it a cold air induction kit. theres a tube attached to a filter like you said and it usually has a heat shield around it so that it gets cold air into the engine. you could just do it how you described and it would be fine.
 

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I pulled off the airbox and used the stock rubber tube. At the end of the tube I slapped on one of those Rice Burner K&N cone filters and used a hoseclamp to hold it on. I then used that clip that comes with tow hooks to mount it onto the power steering bolt. I sits directly above the fan shroud so I figure the air coming in will be somewhat cool even though it's passing through the radiator.
 

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I was an idiot and paid for Rusty's Air Tube thing and K&N. You can do the same thing with a peice of PVC piping and some clamps. Just have to take care of those breather lines somehow.

Good thing about pulling the air box is you have space to install a second battery.

It makes a funny whistle at certain rpms and there is a performance jump.
 

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Discussion Starter · #8 ·
Nice

and that works ok for you?

what did ya do with that hose that goes into the airbox?

thanks
 

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I know it's a $hitty picture, but if you look closely the PCV hose comes out of the valve cover and goes to a drilled hole in the filter. I used silicone to make a seal around the hose and filter.
 

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i was going to say, isn't this what rusty's tube does? i saw a write up a long time ago - i think it's actually on that other dreaded board - cut your intake tube and clamp on a k&n - doesn't work for tj's but does for yj's. anything's gotta be better than the stock stuff.
 

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bzzz, wrong, works for TJ's just as easily.
Make your own tube and stick a K&N or any conical filter at the end. <IMG SRC="smilies/thefinger.gif" border="0">

Just make sure to try and get it away from any of the hot air that is created under the hood, basically the closer to the back of one of the headlights the better. Also keep an eye out for any dust passing through the filter and just use a pre-filter if it is (read shop vac bag or similar).

Better yet install a snorkel and have cold air that is forced into the motor. <IMG SRC="smilies/thefinger.gif" border="0">
 

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i don't think the rusty's tube, or just mounting it directly onto the throttle body works on tj's - but i could be wrong - i didn't think there was enough room under the hood to mount a conical like that. i do know on tj 4.0's you can just cut the tube, but on 2.5's you can't.

but, regardless, i still think getting it as far from the engine without reducing air flow/pressure is highly important in air intake systems.
 

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Yah you can on a 2.5 TJ motor!
Take off that silly box on top of the TB. Remove the bottom rubber tube about 3"long and put that back on the TB. Buy a 2 1/4" PVC 90 elbow. Put that on next. Then take the tube that runs from the box you removed to the air filter and turn it 180 degrees. Clamp it onto the other end of the elbow.
Make a bracket to clamp it to the bolt in the valve cover that the old box bolted to.
Drill and tap 1/4 NPT and put in a brass hose nipple on that tube. Hook the PVC hose here. Bolt on K&N of your choice. Remove old air box and discard. Total price is .99 for hose barb and 1.99 for elbow. I used silicon on all seals just in case.
Boston Mangler had pics of it.
Nate
 

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Well, if you believe what the manufacturer says the Turbo City Air Tube supposedly has less angular curves resulting in more air flowing faster to the engine then the stock rubber tube. john
 

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Discussion Starter · #15 ·
Hey Nate

What i am talking about is much simpler

If anyone has the Sept 2001 Issue Of JP, look on page 74 and you will see what i am talking about.

Thats a pics of the TGC Rig
 

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You YJ guys might already know this but if not here's a cheap trick:

-disconnect your stock air tube from the filter box
-check inside of the tube of the air box, there is an air reducer
-pull the 2 clamps and pull that crap out!

I think it is only on the 6cyl but not sure. Might not be on all model years either. It was used to reduce the power output on the 4.0 b/c the engineers felt the 4.0 produced too much power for the light weight Jeep.

Just found out from a buddy of mine w/ a YJ...
 

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Discussion Starter · #17 ·
Originally posted by P&T jeeps:
<STRONG>You YJ guys might already know this but if not here's a cheap trick:

-disconnect your stock air tube from the filter box
-check inside of the tube of the air box, there is an air reducer
-pull the 2 clamps and pull that crap out!

I think it is only on the 6cyl but not sure. Might not be on all model years either. It was used to reduce the power output on the 4.0 b/c the engineers felt the 4.0 produced too much power for the light weight Jeep.

Just found out from a buddy of mine w/ a YJ...</STRONG>
thanks but thats for 91+ with the MPI

thanks
 

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note: i said you can't just cut the tube on a 2.5 - anybody disagree?? sure, you can take off the stock tube, extend it, add a pvc elbow, etc., then put a k&n on the end - sure. but on a 4.0l all you have to do is cut the end of the tube and clamp the k&n on.

as far as mounting it like rusty's goes, i was saying that i didn't think there was enough room under a tj to mount the k&n directly to the throttle body in a vertical posiition (using the stock rubber connector sleeve that sits under that box part of the intake over the throttle body). can you do that on a tj?
 

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Discussion Starter · #19 ·
no idea even what a 91+ tube looks like on a 2.5L man

i have a 89 which is its own weird enity. i CAN take the tube off and clamp a filter onto the TBI intake (which is horizontal)

i am just wondering why no one has done this

my .02
 

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Originally posted by Skitzo:
<STRONG>note: i said you can't just cut the tube on a 2.5 - anybody disagree?? sure, you can take off the stock tube, extend it, add a pvc elbow, etc., then put a k&n on the end - sure. but on a 4.0l all you have to do is cut the end of the tube and clamp the k&n on.

as far as mounting it like rusty's goes, i was saying that i didn't think there was enough room under a tj to mount the k&n directly to the throttle body in a vertical posiition (using the stock rubber connector sleeve that sits under that box part of the intake over the throttle body). can you do that on a tj?</STRONG>
yep - not a K&N conical filter as such but a similar design. I am sure you could find a K&N to fit as well.
 
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