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how do you bore out the throttle boddy?


 
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djgbsbj
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Joined: 26 Jan 2008
Location: tennessee

PostPosted: Mon Feb 25, 2008 6:11 pm    Post subject: how do you bore out the throttle boddy? Reply with quote

also, will it significantly increse my power. Oh its a 2.5 not a 4.0. if it matters
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Last edited by djgbsbj on Fri Feb 04, 2011 1:17 am; edited 1 time in total
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Mon Feb 25, 2008 6:54 pm    Post subject: Reply with quote

no
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Tue Feb 26, 2008 12:07 pm    Post subject: Reply with quote

From what I've read about the 2.5L, just boring out the TB won't help very much. The best performance for a 2.5L would be stroking the engine, but the cost is prohibitive compared to a full-on 4.0L swapout.

Here is another webpage talking about swapping out JUST your 2.5L TB for a 4.0L one, but I'm not sure about the fitment (NOTE: this is for a YJ).

http://www.angelfire.com/trek/atropine/docs/tb.html

To drill out the throttle body, you need to take apart your air hose from the filter box and remove the TB from the top of the engine. You'll need a new gasket to replace the other one from the removal, but when you clean the TB off and sit the gasket nice and even along the top of it, there'll be a ring of metal exposed by what the gasket doesn't cover. This is approximately how much you can drill SAFELY to widen it out, and you'll need to go as far down as the fuel injector opening inside the TB (which you'll see when you remove the diaphragm. HINT: VERY small screws!!!). Then all that's left to do is put it on a drillpress with a diamond-grinder and start shaving down the inside of the TB until you get as close as you feel comfortable to the edge of the ring. Make sure you get ALL shaved metal out of the middle, as you don't want that stuff mixing in the cylinders. Then you just reattach everything with a good gasket seal and you're done.

NOTE: Even for 4.0L engines, just boring out a TB isn't enough. Changes in airflow, front AND rear, will be needed for noticible effect. This means coldair intake (or a snorkel), cat replacement, and a new muffler (new performance headers never hurt). Hope this helps.
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Tue Feb 26, 2008 9:28 pm    Post subject: Reply with quote

i don't think it is worth the time and whistle you will get .

cheapest thing to do is to sell it and buy a cherokee with a 4.0 in it .
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djgbsbj
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Joined: 26 Jan 2008
Location: tennessee

PostPosted: Wed Feb 27, 2008 7:09 am    Post subject: Reply with quote

Well i have had people tell me that b4 but i just dont want to sell it. Despite the lack of power(which isnt bad 4 a 4cylinder) i just really like this jeep. I plan to keep it until it falls apart.
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