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Author Topic: Throttle body upgrade ?????????????  (Read 1916 times)

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yelpu1

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Throttle body upgrade ?????????????
« on: March 16, 2008, 06:59:10 AM »
I found a 4.0 bored throttle body on E-bay ( bored to 63mm) !  I was wondering if this is too much for my 2.5 without changin the fuel pressure regulator ?????   Thanks in advance for your replys !
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jcsanders79

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Re: Throttle body upgrade ?????????????
« Reply #1 on: March 16, 2008, 08:13:21 AM »
I believe mine is bored to 62mm.
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Offline jfrabat

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Re: Throttle body upgrade ?????????????
« Reply #2 on: March 16, 2008, 10:38:22 AM »
The intake on wranglers (both 4.0 and 2.5L) is 62mm; I've never seen a 63mm bored TB, but that extra mm would not help at all IMO...
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

95yjman

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Re: Throttle body upgrade ?????????????
« Reply #3 on: March 16, 2008, 12:56:58 PM »
Maybe somebody messed up and bored an extra inch  :confused:
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Offline jfrabat

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Re: Throttle body upgrade ?????????????
« Reply #4 on: March 16, 2008, 01:20:04 PM »
Quote from: 95yjman on March 16, 2008, 12:56:58 PM
Maybe somebody messed up and bored an extra inch  :confused:

Dont you mean extra milimeter?
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

95yjman

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Re: Throttle body upgrade ?????????????
« Reply #5 on: March 17, 2008, 06:19:11 AM »
Quote from: jfrabat on March 16, 2008, 01:20:04 PM
Dont you mean extra milimeter?

oops..yep heh
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Offline Bounty Hunter

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Re: Throttle body upgrade ?????????????
« Reply #6 on: March 17, 2008, 05:47:00 PM »
The throttle body opening on the manifold is 62mm on a 4.0L, much smaller on the 2.5L.  The 2.5L manifold needs opened up to get the benefit of an oversized TB.

I sell 62mm TB's for cheaper than most on Ebay, unless it's from trl-rde on Ebay as that is me.  I've got spacers too.

You don't need an adj. fuel pressure regulator to run one, although it may help to have one.  I run a 62mm TB, spacer, and performance cam.  I plan on installing an air/fuel guage and adj. fuel pressure regulator so I can dial in the A/F ratio.  Likely an adj. MAP sensor as well.
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