4bangerjp.com
General Forums => The Mess Hall => Topic started by: Dont Know Squat on December 06, 2005, 01:30:28 PM
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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?
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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.
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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?
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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.
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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 ;)
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Ya, Ya...
MSD Ignition with blaster coil and Moroso 8mm wires too! :lol:
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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?
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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/
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Oh, a TJ'er. I don't associate them them people. :wink:
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YJ PRIDE
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I own a YJ too...
There's something to be said about square headlights!!
Although if I could do it all over again.... Hummm...
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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:
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I doubt a 2.5L could really see much gain over 54mm without boring out the intake.
Not much wheeling in SF... :wink:
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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.
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Stock 2.5L is around 45mm's while a 4.0L is around 54mm.
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Stock 2.5L is around 45mm's while a 4.0L is around 54mm.
That's still a major difference. I am gonna get some more drimel bits and bore out the spacer and the TB. I did a little boring on the intake already.
Note: Made sure no shavings got into the intake and motor. I am Crazy but not stupid. LOL!
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I still haven't bothered matching the port opening.
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I still haven't bothered matching the port opening.
What all have you done to you 4banger? Just curious. You don't have anything listed in your signature.
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Nothing internal other then taking care of it. PD Ignition gapped at .060". Performance Carsound Cat-back, Borla Exhaust. Went back to the stock airbox and Fram Filter. 4.0L TB and a 1" Poweraid Spacer. This has tuned the powerband a bit higher but still gives me decent power in the mid to high range. I could have opened up the exhaust more to allow for more top end but then I lose low-end. It's all about tuning for what you want and not just slapping parts on. Hard part it knowing where it's going to change things.
I probably should have kept my .440 cam but since I moved to a Emissions state, I didn't want to risk it.