Topic: Is 62mm TB too much for the 2.5??

[Dont Know Squat]

I did a search and couldnt find a lot on this. so I am looking to swap the T.B and add a spacer. Is a 62 mm to much ? I have a pretty stock 2.5 with the exception of a "cold air" intake and a highflow cat and dynomax exhaust..anyone done this on the 2.5?

[Jeffy]

I do not recommend going with a 62mm unless you plan on doing a lot of other work.  It's too much air for the stock setup and you'll run into problems.  Not to mention if you're planning on buying a 62mm TB, you'd be better off saving your money and going with a stock 4.0L tb for a fraction of the cost.

[Dont Know Squat]

thanks jeffy. so what other stuff would need to be done just for conversation sake? hotter spark? different injectors? cam? would it be about like running a carb with too much cfm?

[SMC4WD]

I'm running a 4.0L that has been bored out.   I don't remember what is was bored out to, it was just shy of what Rubicon does.

I got my from your buddy (Jeffy), James at Jeepers Creepers in S.F.  

I opened the factory box, removed the reducer tubes with a K&N air filter.  I'm running an AiRaid poweraid TB spacer and a Turbo City MAP sensor.  

As said before...   Teeny bit here and there adds up.

[Bounty Hunter]

I think you could get away with it but at a minimum would want an Adj. MAP sensor to dial in your air/fuel ratio.  Then a FirePower ignition setup to make sure all the extra fuel is well burnt.  Index the plugs while you're at it

[SMC4WD]

Ya, Ya...

MSD Ignition with blaster coil and Moroso 8mm wires too!  

[Jeffy]

I got my from your buddy (Jeffy), James at Jeepers Creepers in S.F.  

Hmm, I'm not sure if I know him.  Did he say he knows me?

[SMC4WD]

I got my from your buddy (Jeffy), James at Jeepers Creepers in S.F.  

Hmm, I'm not sure if I know him.  Did he say he knows me?

No...  But since he's in S.F. and you're in the No Cal area somewhere, I had to figure you've heard of him.  His name is James and a guy named Shaun works there too.

He runs a business that's mostly internet.  Primarily caters to TJ's.  I picked up a custom dual battery setup from him, and that bored out TB.  Really a great guy to deal with and talk to.

Check him out sometime.
(Shameless plug here:)
http://www.jeepersandcreepers.com/

[Jeffy]

Oh, a TJ'er.  I don't associate them them people.   :wink:

[jeepfourlow]

YJ PRIDE

[SMC4WD]

I own a YJ too...  

There's something to be said about square headlights!!  

Although if I could do it all over again....    Hummm...

[jeepersandcreepers.com]

Hi Guys, We got a few emails concerning the 4.0L throttle body on a 2.5L and I can tell you the 60mm is more then enough for the 2.5L We have had a few people try out the 62mm on the 2.5L and they did not gain any performance but wound up getting a few check engine codes.

We do bore out the 2.5L throttle bodies to 60mm and this will save you from having to purchase a 4.0L throttle body. We no longer bore the stock throttle bodies to 62mm due to cracking of the base. If you really feel you need 62mm, I would recommend a re-designed throttle body and not the stock one because the wall on the stock throttle body tends to get weak and if you add a after market air filter kit with hose, they tend to stress the throttle body and may cause it to crack.

Here's an older link on a bored out throttle body on a 2.5L http://www.gottrail.com/TJ/4.0TB.html

PS: We like YJs and all the other cool Jeeps out there (previous square headlight Wagoneer owner)  :wink:

[Jeffy]

I doubt a 2.5L could really see much gain over 54mm without boring out the intake.

Not much wheeling in SF... :wink:

[jwrape]

I doubt a 2.5L could really see much gain over 54mm without boring out the intake.

Not much wheeling in SF... :wink:

Not sure what the stock measurements of the 2.5L TB and the 4.0 TB are but I know when I put the 4.0 TB on, it really made a nice difference in low and RPM rev up. It is one of the best upgrades that I have done.

[Jeffy]

Stock 2.5L is around 45mm's while a 4.0L is around 54mm.