4.0l Power mods - JeepForum.com
 
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post #1 of 13 Old 02-28-2013, 12:38 PM Thread Starter
MountainGoat02
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4.0l Power mods

I have an 02 Wangler X and I want to get some more power out of it. I have done some research and I KNOW it isn't a performance motor, I have no need or money to re-gear it, and I know about all the drive train loss. It's the only vehicle I have right now so I want to make it more fun to drive. With that said these are the engine mods I have: Syth oil, CAI, TBS ($10 why not), MBRP Cat-back, Bosh 2+'s, Electric fan, Brown Dog Mounts, 180 deg t-stat.

What would be the next best upgrade?
Would a programmer/re-flash help bring the most out of these? or header?

I've heard mixed reviews about everything and honestly I don't know what to believe. Also note that I am not interested in forced induction or a stroker.

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post #2 of 13 Old 02-28-2013, 12:45 PM Thread Starter
MountainGoat02
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I'm not regearing it because in the future I want to upgrade to at least 4.10s. If I'm going to have it apart and have to change carriers, I'm going to upgrade to lockers front and rear. But that wont be for a couple years when I move to a place where I do enough wheeling to justify that upgrade. Hate noreast jersey
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post #3 of 13 Old 02-28-2013, 12:47 PM
JBTJ
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Quote:
Originally Posted by MountainGoat02 View Post
I have an 02 Wangler X and I want to get some more power out of it. I have done some research and I KNOW it isn't a performance motor, I have no need or money to re-gear it, and I know about all the drive train loss. It's the only vehicle I have right now so I want to make it more fun to drive. With that said these are the engine mods I have: Syth oil, CAI, TBS ($10 why not), MBRP Cat-back, Bosh 2+'s, Electric fan, Brown Dog Mounts, 180 deg t-stat.

What would be the next best upgrade?
Would a programmer/re-flash help bring the most out of these? or header?I've heard mixed reviews about everything and honestly I don't know what to believe. Also note that I am not interested in forced induction or a stroker.
All a waste of money and will yield nothing but a lighter wallet. Since you don't want to regear then you have nothing left that you can afford.
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post #4 of 13 Old 02-28-2013, 12:50 PM
freeskier93
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Quote:
Originally Posted by MountainGoat02 View Post
I have an 02 Wangler X and I want to get some more power out of it. I have done some research and I KNOW it isn't a performance motor, I have no need or money to re-gear it, and I know about all the drive train loss. It's the only vehicle I have right now so I want to make it more fun to drive. With that said these are the engine mods I have: Syth oil, CAI, TBS ($10 why not), MBRP Cat-back, Bosh 2+'s, Electric fan, Brown Dog Mounts, 180 deg t-stat.

What would be the next best upgrade?
Would a programmer/re-flash help bring the most out of these? or header?

I've heard mixed reviews about everything and honestly I don't know what to believe. Also note that I am not interested in forced induction or a stroker.
Then your just wasting your time/money with all the other snake oil.
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post #5 of 13 Old 02-28-2013, 02:17 PM Thread Starter
MountainGoat02
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What is the highest ratio you can go without changing carriers? I found 3.73 and i just want to check. Right now I have 31in mud tires and may upgrade to 33s in the near future.

Is that enough of a change to justify the cost or should I just wait until I can afford lockers and 4.10s?
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post #6 of 13 Old 02-28-2013, 02:21 PM
JBTJ
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Carrier is $50, no big deal.
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post #7 of 13 Old 02-28-2013, 02:27 PM
sailsurf7713
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Get some axles out of a 4 banger. BOOM. Done. Oh and take all that **** off.

'99 SE: The "It could be worse..." jeep

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...I say don't lift but CUT. :)
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post #8 of 13 Old 02-28-2013, 03:13 PM
tyvanwie
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Buy them all. Then come back and look at all the threads where literally no one says that they help.

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I don't even own a jeep anymore
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post #9 of 13 Old 02-28-2013, 03:27 PM
Jrob05
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Should really put the stock spec 195* thermostat back in so the engine can get up to temp.
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post #10 of 13 Old 02-28-2013, 03:32 PM
Robert J. yates
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Put a couple of ricer stickers on it, a fart can exhaust and a K&N.. that should be good for 40 to a zillion more ponies

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post #11 of 13 Old 02-28-2013, 06:03 PM
3eff_Jeff
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Quote:
Originally Posted by MountainGoat02 View Post
What is the highest ratio you can go without changing carriers? I found 3.73 and i just want to check. Right now I have 31in mud tires and may upgrade to 33s in the near future.

Is that enough of a change to justify the cost or should I just wait until I can afford lockers and 4.10s?
The carrier break on your Dana30 is 3.54/3.73 and your Dana35 has a 3.31/3.54 carrier break. Which means if you've got 3.07 gears, you'll need to upgrade both carriers to get 3.73 or higher gears. Find some axles out of a 4 banger, because your gears are your problem. I've got 3.73 gears and 30" tires, and my 4.0 is a hoot.

(My research, a not insignificant portion of which has been reading Robert J. Yates' posts, indicates power mods to the 4.0 all mean lots of internal work. Cam, rebuilding for better quench height and compression, a little overbore and you might as well throw in a stroker crank if you've done all that, or save yourself a bit of trouble and just buy a Golen or similar. No internal work means supercharger.)
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post #12 of 13 Old 03-01-2013, 11:25 AM
joe108
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As mentioned, none of those things will work except for one, the low temp thermostat, yes it will cause the engine to run cool, so the computer thinks it needs a richer mixture which will burn up your converter in short order, don't ask how I know.
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post #13 of 13 Old 03-01-2013, 04:07 PM Thread Starter
MountainGoat02
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Thanks for the feedback. Ive been looking into the trutrack which Ive heard nothing but good things about. Its not cheap but still cheaper than an e-locker. This is my daily driver so It looks like the perfect fit for me and the wheeling I currently do. Once I get a car to drive daily Ill go nuts w my jeep. But until then just wana have fun with what i have. Thinking about a re-gear with a trutrack in the rear and appropriate carrier in the front. Have fun wheelin this weekend
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