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4bangerJP.com > General Forums > The Mess Hall > Topic: Throttle body upgrade ?????????????
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yelpu1
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« on: March 16, 2008, 05:59:10 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 Huh???   Thanks in advance for your replys !
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jcsanders79
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« Reply #1 on: March 16, 2008, 07:13:21 AM »
I believe mine is bored to 62mm.
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jfrabat
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« Reply #2 on: March 16, 2008, 09:38:22 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, Adv. Ad. SYE, Woody Shaft, Superwinch EPi9.0, 62mm TB, FoMoCo e-Fan, SD30 and SD35 w/ARB-4.88, 165A alt., 4 KC aux lights, Aluminum Rad, BRX hoses, 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Bosch 19# Injector, Safari Snorkel, Hydroboost
95yjman
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« Reply #3 on: March 16, 2008, 11:56:58 AM »
Maybe somebody messed up and bored an extra inch  confused
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Trail Jeep: 95 YJ, 33's, 4:88's, spooled D44 rear, BDS Lift

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jfrabat
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« Reply #4 on: March 16, 2008, 12:20:04 PM »
Quote from: 95yjman on March 16, 2008, 11:56:58 AM
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, Adv. Ad. SYE, Woody Shaft, Superwinch EPi9.0, 62mm TB, FoMoCo e-Fan, SD30 and SD35 w/ARB-4.88, 165A alt., 4 KC aux lights, Aluminum Rad, BRX hoses, 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Bosch 19# Injector, Safari Snorkel, Hydroboost
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« Reply #5 on: March 17, 2008, 05:19:11 AM »
Quote from: jfrabat on March 16, 2008, 12:20:04 PM
Dont you mean extra milimeter?

oops..yep heh
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Trail Jeep: 95 YJ, 33's, 4:88's, spooled D44 rear, BDS Lift

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« Reply #6 on: March 17, 2008, 04:47:00 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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