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Dakota Performance
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modain
GenIII
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10/20/2005
18:57:23

Subject: 2.5L TB Size - Upgrade Choices
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I've been looking into the possibility of putting a Jeep 4.0L TB onto my son's 2.5L Dakota. I've run across lots of posts indicating that popping a 4.0L TB onto this engine will give it a noticable (but small) HP boost.

I can't seem to find what the stock 2.5L TB size is, what the stock 4.0L TB size is, and how big I can go before affecting the performance in the wrong direction. And also, what years will these parts interchange.

=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forrest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open


N56629
Dodge Dakota
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10/20/2005
19:14:42

RE: 2.5L TB Size - Upgrade Choices
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I thought they had a 2.5 board on here. Since you are a member you can do a search. Also it shouldn't be too hard to modify the existing tb.



modain
GenIII
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10/20/2005
19:27:55

RE: 2.5L TB Size - Upgrade Choices
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The Members 4-Cylinder board was removed - to free up the space, and it hadn't had any real activity in quite a while. Before it disappeared none of the posts had any info that I am requesting...

=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forrest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open


N56629
Dodge Dakota
JOIN HERE


10/20/2005
21:31:38

RE: 2.5L TB Size - Upgrade Choices
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I can tell that the stock 4.0 tb is 56x60mm. One of the mini-van sites might have some info



Hemiman
Dodge Dakota
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10/27/2005
21:17:33

RE: 2.5L TB Size - Upgrade Choices
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Unless you have a turbo you can pretty much forget changing the throttle body. If they are still using the same style as the 94 2.5. I might be wrong because I have not seen any 2.5 in Dakota's as of late. My son races a 85 Omni GLH Turbo. You can always build a Turbo engine.



modain
GenIII
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10/27/2005
21:52:46

RE: 2.5L TB Size - Upgrade Choices
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I don't understand why I should forget about changing the TB. Jeep 4 bangers do this to get a little more power. It's the same engine in the Wrangler - an AMC 4.0L straight six with the middle two cylinders removed. It's not the same 2.5L SOHC engine found in the Omnis and so forth. I don't know what year DC started using this engine.

=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forrest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open


daveshotdako
GenIII
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10/28/2005
10:16:42

RE: 2.5L TB Size - Upgrade Choices
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the jeep 4.0 tb really makes no difference in power when put on a jeep 4 banger. i tried this on my buddys wrangler and it made no difference at all. the 4.0 tb is tapered from 62mm at the top to 56mm at the bottom whereas the 2.5 tb is a straight through 52mm bore. it is worth a try though. when coupled with other mods, it will make a difference. just good luck trying to find jeeps in junkyards. here in georgia, i cannot find any at all because special jeep junkyards buy them out of others and have them at their yard. i have an '85 jeep cj7 and it is damn near impossible to find them in junkyards. it originally had the carburated 2.5l four banger when i got it in highschool. i swapped in a 4.2l inline six that is built. right now, the transmission is out of it. since i put the motor in it, i have gone through two transmissions. oh well. thats what i get with all that neck snapping torque that thing has.

GET IN, SIT DOWN, SHUTUP, AND HOLD ON
custom 48mm tb, tps @ .768, relocated IAT, 180 t-stat, autolite double platinum, taylor wires, flowmaster 40 delta flow single in/dual out, CAI

modain
GenIII
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10/28/2005
11:33:40

RE: 2.5L TB Size - Upgrade Choices
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Thanks Dave. I was hoping to get some info from someone who knows the specs and has gone down that path.

=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forrest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open


daveshotdako
GenIII
 User Profile


10/28/2005
12:39:46

RE: 2.5L TB Size - Upgrade Choices
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not a problem. thats what we are here for right?

GET IN, SIT DOWN, SHUTUP, AND HOLD ON
custom 48mm tb, tps @ .768, relocated IAT, 180 t-stat, autolite double platinum, taylor wires, flowmaster 40 delta flow single in/dual out, CAI

modain
GenIII
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10/28/2005
15:08:01

RE: 2.5L TB Size - Upgrade Choices
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Message:
Yup. That's what it's all about...

=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forrest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open


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