BIG BLACK BOX= RESONATOR

pierrexj · Jan 3, 2009

While searching in the internet I found out the box I was asking about is called a resonator, it's there to make the engine more quiet, I think it's not very common on the american models ,mine is 99' 4.0 ...
I still on't know if removing it will have any benefit though..

http://picasaweb.google.com/juancruzarguelles/DropBox?authkey=KOKJjdr6YAY#5286330831878505746

Matthew Currie · Jan 3, 2009

Interesting. That's not a standard part on a US model XJ. We get a plain rubber hose running from air filter box to the top of the throttle body. Included in that setup is a venturi to provide the suction for the evaporative emission system.

I'm guessing it won't make much difference either way, but you should probably make sure that any plan to remove or modify it doesn't affect the evaporative emission setup, if you have it.

heyhar · Jan 3, 2009

What does the snorkel tubing look like under the wrap? Is the radiator looking piece on top of the TB some sort of intercooler for a secret Turbo model?

Saudade · Jan 3, 2009

The parts manual shows them from 94 up. They list different countries are requiring them. (None in North America)

Mr_Random · Jan 3, 2009

Yeah, some grand cherokee's might have had them, and I've seen 2.5L TJ's with them, just a resonator box to give it a better sound as far as I know. Some boxes manipulate the frequency of the engine to induce more of a vacuum effect, but I doubt Jeep/chrysler (but possibly AMC) would spend their time manufacturing/engineering such a component for only 1hp/1ft/lb of gain.

pierrexj · Jan 3, 2009

Mr_Random said:
Yeah, some grand cherokee's might have had them, and I've seen 2.5L TJ's with them, just a resonator box to give it a better sound as far as I know. Some boxes manipulate the frequency of the engine to induce more of a vacuum effect, but I doubt Jeep/chrysler (but possibly AMC) would spend their time manufacturing/engineering such a component for only 1hp/1ft/lb of gain.

But the picture is of my 99' cherokee xj though...

Saudade · Jan 3, 2009

Saudade said:
They list different countries are requiring them. (None in North America)

That should be *as requiring*. Still pretty lousy English but what I had intended to post. Dang spellcheckers!!

pierrexj · Jan 3, 2009

Saudade said:
That should be *as requiring*. Still pretty lousy English but what I had intended to post. Dang spellcheckers!!

I understood it just fine...thanks for the illustration...obviously some countries require it, I'm sure Argentina it's not one of those ,they are not very strict on emissions or engine noise here...

Blaine B. · Jan 4, 2009

Remove the venturi from the airtube going from the throttle body to the airbox. It's more of an air restrictor than anything.

pierrexj · Jan 4, 2009

Blaine B. said:
Remove the venturi from the airtube going from the throttle body to the airbox. It's more of an air restrictor than anything.

Sorry,what does the venturi look like ?
Thanks

Blaine B. · Jan 4, 2009

That round tube thing on the left. You just slide it out.

pierrexj · Jan 4, 2009

Blaine B. said:
That round tube thing on the left. You just slide it out.

I see...mine doesn't seem to have it though...maybe the resonator (big black box) it's supposed to do the work ,if that is making the engine more quiet...
It seems "export models" might be a little different on some things maybe...
Mine is a cherokee "classic"...for instance here it's registered as a 2000 model,but when I checked the VIN number it said it was made in 99" ,so I consider it a 99' model...another interst thing is that it's armored,wich adds about 400 pounds to it ,so when you got people on it on top of that,it gets quite heavy...

Blaine B. · Jan 4, 2009

Alot of vehicles are made towards the end of the 4th quarter of the previous year and are designated the next year.

For instance my 95 XJ was made in December of 94.

pierrexj · Jan 5, 2009

Blaine B. said:
Alot of vehicles are made towards the end of the 4th quarter of the previous year and are designated the next year.

For instance my 95 XJ was made in December of 94.

Isee...then maybe it is a 2000...

Blaine B. · Jan 5, 2009

Most likely, if it is registered as a 2000, it probably is

pierrexj · Jan 5, 2009

Blaine B. said:
Most likely, if it is registered as a 2000, it probably is

Lol...sounds like a no brainer right...? Now that I recall,when I checked the VIN, the manufacturing date was April 99'...therefore I had my doubts about if the designation 2000' was right or not...:spin1:

Blaine B. · Jan 5, 2009

Hm that is a good question. I suppose it could be deignated as a 2000 if they wanted. You'd really have to check the casting number on the head. 0331 started mid/late 99 and continue on to 2000 and 2001.

The only XJ's wit the 0331 head were designated as 2000 and 2001.

So if you still had the older head before 0331 it would have to be designated 1999.

pierrexj · Jan 5, 2009

Blaine B. said:
Hm that is a good question. I suppose it could be deignated as a 2000 if they wanted. You'd really have to check the casting number on the head. 0331 started mid/late 99 and continue on to 2000 and 2001.

The only XJ's wit the 0331 head were designated as 2000 and 2001.

So if you still had the older head before 0331 it would have to be designated 1999.

That number is 5301023611596...

winterbeater · Jan 5, 2009

The 10th digit in the VIN designates the model year. If it says "Y" it is 2000. Maybe X is 1999, but I don't know that for sure. Normal model year changeover is in August or September when they begin making the next years model. This is not written in stone, but any variation would be to start earlier instead of later. If it was built in September or later of 1999, it is almost certainly a 2000.

pierrexj · Jan 6, 2009

winterbeater said:
The 10th digit in the VIN designates the model year. If it says "Y" it is 2000. Maybe X is 1999, but I don't know that for sure. Normal model year changeover is in August or September when they begin making the next years model. This is not written in stone, but any variation would be to start earlier instead of later. If it was built in September or later of 1999, it is almost certainly a 2000.

I see ,I runned the number on vin decoder online and it comes out as a 99...(the letter is,indeed ,an x)...it it shows is made in "Kanada"...and that is a 4-speed Automatic Transmission (Europe)...I wonder if there is any difference between Europe and USA transmission wise...

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