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Old 03-05-2012, 06:10 PM   #1
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Performance upgrades on a 2.5L

I got me a few questions and ideas and I am going to let all fo you help me make the decisions. I have a 2.5L that alot of you will say just dump but Im not quite ready for that yet. The engine is bone stock with the exception of the poweraid TB spacer. Here is what i am looking for:

Oil and filter; best synthetic blends and what weight. best oil filter? Keep in mind, I live in Tucson, Az and 90% driving being done there occasionally driving up into the AZ mountains.

Cold Air Intake?

TB upgrade? 4.0 and 2.5 have same foot print but are they the same stock TBs? Aftermarket TB?

Performance exhaust?

Spark plugs? what gap? Spark plug wires? Coil?

Injectors? Fuel rail? Fuel Rgulator?

These are the areas I am looking at. Am I missing anything? For those that will ask, and i knw it would come, The suspension is stock at the moment. I will be adding a 1.75-2.00" Lift. for weight purposes and the fact I dont aggressivly off road, it will just be the spring spacers and shocks. 30x9.5 is my intended tire size. Any other quetions, just ask. If none, all ideas and or suggestions would be awesome. Thx
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Old 03-05-2012, 11:23 PM   #2
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Please read my thread entitled "love your 4 cylinder"

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Old 03-06-2012, 12:49 AM   #3
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Not worth even trying. Re-gearing would probably be your best bet in the end. I have a 4 banger and i used to get upset about being passed by semi trucks going up grades, but now ive learned to love her for what she really is, a low speed vehicle that can take you to places people only dream of going in there big lifted trucks ( dont get me wrong i would give my left testi for a hemi in my jeep but lets be practical )
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Old 03-06-2012, 01:11 AM   #4
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The 2.5L has been around awhile and lots of attempts have been made to increase power or increase MPG....it seems after all these years we are stuck with just keeping the motor maintained for the best performance, reliability and longevity.
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Old 11-29-2015, 09:08 PM   #5
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This is what I've done to my jeep.
4.0 throttle body
Bored intake to 62mm
62mm TN spacer
19lb 4 pattern fuel injectors
BORLA header
Ngk racing v groove plugs gapped at .42
Cold air intake
Davis unified ignition 50k volt coil, 8mm wires, brass terminal cap and rotor
High flow cat
Torque tube muffler
The last 5" of my exhaust is 3" diameter tube
Mopar roller rockers
As far as oil goes...
I use 10w30 castrol synthetic with either a k&n filter or Mobil 1 filter
I shop around for my parts on eBay and buy as I can and do the work myself.
My jeep was a bone stock 2000 wrangler TJ squeezing out 120 hp.
With running 265.75.16 mudders on pro comp 16" black rock wheels
and all of the add on accessories, I can cruise at 75 plus mph in 5th gear,
climbing hills still gets my speed down but nothing serious!
We drove it to Hilton Head SC for vacation this past summer with my wife and two teenage kids and we had a lot of fun in it and even ran the AC!!
My fuel mileage averages 17.6-19.2 mpg depending on how hard I run it!
Up next is a cam swap and have the head machined.
I've already bought my RVOB4 cam from hesco and will use there lifter, pushrod, valve spring and retainer setup, along with an improved timing chain if I can find one.
If anyone has any questions, feel free to ask!!
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Old 11-29-2015, 09:09 PM   #6
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This is what I've done to my jeep.
4.0 throttle body
Bored intake to 62mm
62mm TN spacer
19lb 4 pattern fuel injectors
BORLA header
Ngk racing v groove plugs gapped at .42
Cold air intake
Davis unified ignition 50k volt coil, 8mm wires, brass terminal cap and rotor
High flow cat
Torque tube muffler
The last 5" of my exhaust is 3" diameter tube
Mopar roller rockers
As far as oil goes...
I use 10w30 castrol synthetic with either a k&n filter or Mobil 1 filter
I shop around for my parts on eBay and buy as I can and do the work myself.
My jeep was a bone stock 2000 wrangler TJ squeezing out 120 hp.
With running 265.75.16 mudders on pro comp 16" black rock wheels
and all of the add on accessories, I can cruise at 75 plus mph in 5th gear,
climbing hills still gets my speed down but nothing serious!
We drove it to Hilton Head SC for vacation this past summer with my wife and two teenage kids and we had a lot of fun in it and even ran the AC!!
My fuel mileage averages 17.6-19.2 mpg depending on how hard I run it!
Up next is a cam swap and have the head machined.
I've already bought my RVOB4 cam from hesco and will use there lifter, pushrod, valve spring and retainer setup, along with an improved timing chain if I can find one.
If anyone has any questions, feel free to ask!!
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Old 11-29-2015, 09:56 PM   #7
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When i had a 2.5 i bought a small cam from mopar they had a sale for $29.00 on them and put header n i got more power out of that then a chip n cold air intake.
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Old 11-30-2015, 07:15 AM   #8
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Quote:
Originally Posted by Madjeeptj View Post
....My jeep was a bone stock 2000 wrangler TJ squeezing out 120 hp.....
So how many HP ya putting out now?
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Old 11-30-2015, 10:09 AM   #9
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I'll bet he's getting 125.
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Old 12-01-2015, 12:44 AM   #10
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Quote:
Originally Posted by sparky View Post
I'll bet he's getting 125.
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Old 12-03-2015, 02:06 AM   #11
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After 30 plus years of building jeeps with various engines in them, I reckon I don't have a clue how to squeeze out some HP from. 2.5 four cylinder without breaking the bank!
I post what I have done to mine and not just this jeep....
So that other members can have some idea as to what they can do with theirs to gain some added horsepower and torque without "selling it and buying a 4.0 jeep, V6-V8 swap, etc"
I have turboed and supercharged the 2.5's with success but it gets expensive and nowadays the parts aren't as inexpensive and available as they used to be.
Re-gearing is a viable option and in some cases the only way you will what you desire from the 2.5
As for how much horsepower I'm getting from mine with what I've done...
We did dyno the jeep after the roller rockers and rwhp was at 121!
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Old 12-03-2015, 08:30 AM   #12
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Sell your 2.5 and get a 4.0.
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Old 12-03-2015, 11:14 AM   #13
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My jeep was a bone stock 2000 wrangler TJ squeezing out 120 hp.

We did dyno the jeep after the roller rockers and rwhp was at 121!

So you put a lot of effort in and picked up 1HP
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Old 12-03-2015, 01:03 PM   #14
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Quote:
Originally Posted by sparky View Post
My jeep was a bone stock 2000 wrangler TJ squeezing out 120 hp. We did dyno the jeep after the roller rockers and rwhp was at 121! So you put a lot of effort in and picked up 1HP
Hp at the crank is going to be more than hp at the wheels. I'd guess he gained somewhere around 30hp out of all of the mods
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Old 12-04-2015, 10:35 AM   #15
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Regear, proper tuneup and loose all the weight you can.
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Old 12-04-2015, 11:34 AM   #16
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On that long list of upgrades above, I can see where maybe 3 of them could help... the roller rockers, header, and opening up the intake to match the header. In my personal opinion, the throttle body spacer (a joke product when installed under a modern air-only TB), NGK spark plugs, CAI, ignition coil, etc. did absolutely nothing to improve performance. I installed my first performance upgrades on my old long-gone '57 Chevy with its carbureted 283 engine back in '64 so I'm not new to any of this.

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