4.0 bored throttle body - JeepForum.com
 
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post #1 of 13 Old 05-13-2011, 07:14 PM Thread Starter
hoyt5885
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4.0 bored throttle body

i am looking at a bored throttle body from ebay and am wondering if it is worth it or not.

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post #2 of 13 Old 05-13-2011, 07:28 PM
the88thpianoman
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That depends largely on the price and the size of the bore.

2003 WJ in Jeep Green Metallic, 4.0/242/4.10's. 4" Teraflex springs w/ RE monotube shocks and IRO short arms, cheap intake w/ amsoil filter, 2.5" hi flow cat and back exhaust, lots of lights and other misc crap.

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post #3 of 13 Old 05-13-2011, 07:45 PM Thread Starter
hoyt5885
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price is 89.99 with a core and the bore is a 62/63mm bore
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post #4 of 13 Old 05-13-2011, 07:50 PM
Coolhand20th
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post #5 of 13 Old 05-13-2011, 08:25 PM
the88thpianoman
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I would say yes, then. But not unless you're upgrading other stuff as well. The idea is more air in, more air out. $90 is a good price, but you're not going to get much out of it without a high flow exhaust and air intake/cone filter. If you're really feeling adventurous, ported intake and exhaust channels in the cylinder head will make the most of the other upgrades too.

2003 WJ in Jeep Green Metallic, 4.0/242/4.10's. 4" Teraflex springs w/ RE monotube shocks and IRO short arms, cheap intake w/ amsoil filter, 2.5" hi flow cat and back exhaust, lots of lights and other misc crap.

Check out my build thread here: Life lessons and budget build
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post #6 of 13 Old 05-13-2011, 10:02 PM
bushido7seven
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yea what he said. first get a high flow muffler then cold air intake then the bore 62mm. Thats what I am going to do.
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post #7 of 13 Old 05-14-2011, 06:59 AM
nickblack
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I bought a 62mm ported TB and have felt no "seat of the pants" difference. I have a K&N intake and a high flow CAT and muffler, which I did first. The Cat & muffler made a difference, the TB did not. The thing with the ported TB is that if you don't also port the intake manifold, to match the TB, you won't get the added benefit. I was not willing to cut into the intake manifold, but if you are, I bet you will feel a difference.
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post #8 of 13 Old 05-14-2011, 09:54 AM Thread Starter
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i have a cold air intake and high flow exhaust
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post #9 of 13 Old 05-14-2011, 10:32 AM
billzcat1
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Not worth it. A 60mm throttle body is plenty for the 200hp a 4.0 puts out. If it were a higher-revving engine, I would say go for it. But for the low-end-torque, barely-makes-it-past-4000-rpm nature of the beast, its not going to make a lick of difference.
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post #10 of 13 Old 05-15-2011, 09:09 AM
nickblack
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^^ agree with this rationale, I wasted my money out of curiosity. Us 4.0L owners are always looking for more power that is kind of impossible to get without stroking. As Narnwv says: "nobody with a V8 wishes they had an I6"
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post #11 of 13 Old 05-15-2011, 05:35 PM
BransJeep
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i have that throttle body as well as intake and exhaust and it really helped my wj out, saw about 1-2 mpg increase as well

-Brandon
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post #12 of 13 Old 05-15-2011, 06:01 PM
Bubba3200
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Wouldnt a bored TB only benefit at full throttle? Dosent the computer limit or should I say control the air gas mix? If you put higher flowing injectors in they dont do much if anything cuz the computer will be programed to only flow a certain amount at a certain rpm. Like others have said a bigger bore TB is only part of a "system" that has to be done to make more HP. Just thinking out loud here....if you dump more air in then you need more fuel to burn. If you dump more fuel in then you need more air. I think these mods had more affect on non computer controlled cars of the past.
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post #13 of 13 Old 05-15-2011, 09:33 PM
rm2001wj
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Yes, you are right. Until the throttle is wide open, the position of the throttle plate or butterfly controls and limits the amount of air going into the engine. A small increase in the diameter of the TB does does nothing during part throttle operation. The computer, with input from the O2 sensors, is going to cause the injectors to inject more or less fuel to match the air flow so that the A/F ratio stays near the 14.7:1 stoichiometric ratio.
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