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Unread 09-29-2006, 11:04 AM   #1
n20jeep
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Cheap Power Mods For The XJ...

c'mon, everyones got some cheap ways to get quicker with an XJ....post em up

ill start...

Junkyard Gear Swap (for manual equipted XJ's)- find an auto equipted XJ with the 3.55's, and remove the whole rear axle...then just swap out your stock 3.07 rear end with the Junkyard rear end......the whole swap can be done for well under $200, and can be completed in less than a day....

Adjustable MAP- it will help if you have a few bolton's, and can be made from RadioShack parts for under $20...and instalation is easy...

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Unread 09-29-2006, 12:07 PM   #2
Ivanito
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Smaller diameter tires Poor man's way to gear change (I did the math, and my gears work out to ~3.70).
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Unread 09-29-2006, 02:43 PM   #3
Matt Gertsch
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Quote:
Originally Posted by Dragisco
Smaller diameter tires Poor man's way to gear change (I did the math, and my gears work out to ~3.70).
That's why I run 235/75R14s.
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Unread 09-29-2006, 03:13 PM   #4
alexrule123
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homemade air intake (I finally re-painted it)



And bored throttle body



Quote:
Originally Posted by mgertsch
That's why I run 235/75R14s.
i am running the same...except i have 15" rims
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Unread 09-29-2006, 03:18 PM   #5
Ivanito
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So you are actually slower and your true gearing will be lower than 3.55 :P
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Unread 09-29-2006, 03:20 PM   #6
alexrule123
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Quote:
Originally Posted by Dragisco
So you are actually slower and your true gearing will be lower than 3.55 :P
so...i more then make up for it in raw horsepower
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Unread 09-29-2006, 03:25 PM   #7
Ivanito
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hahahahahaha, hey, do you still have your stock airbox?
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Unread 09-29-2006, 03:28 PM   #8
alexrule123
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Quote:
Originally Posted by Dragisco
hahahahahaha, hey, do you still have your stock airbox?
yes, but i want to keep it if i ever want to drive through some deep water...again
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Unread 09-29-2006, 03:31 PM   #9
Ivanito
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dang, Im looking for another one...
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Unread 09-29-2006, 03:39 PM   #10
alexrule123
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Quote:
Originally Posted by Dragisco
dang, Im looking for another one...
why do you want one? to use it as a heat shield?
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Unread 09-29-2006, 05:34 PM   #11
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The best way to get more power out of any stock engine, for the least amount of money, is to advance timing and run 91 octane. The fixed timing on the 4.0L's will require an adjustable crank position senser. not that expensive, and not that hard to do.

If I want'ed to make the most power out of the 4.0L without going FI I would:

- Cold air intake
- Header
- 2.5" exhaust with flow through mufflers
- advance timing 2-4 degrees
- bump up the fuel pressure 2-3psi.
- Replace cap/rotor, plugs, and wires
- swap out the stock coil for a MSD SS (has far less resistance, and more voltage output than the normal cup style coils).

Theres not much you can do other than that to get more power without going stroker or forced induction.
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Unread 09-29-2006, 06:33 PM   #12
UltimatE
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Geese, I'm surprised no one has listed this one. It should be like the first thing anybody does to gain power.

Put a Type R sticker on your rear, driverside window. Make sure it is exactly 0.25 inches to the left, and 0.125 inches up from the molding in the bottom right corner.

This will surely add at least 20hp straight off the bat. Remember, the more stickers you have, the more HP you will gain! There's no telling how high you can get!
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Unread 09-29-2006, 06:45 PM   #13
alexrule123
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Quote:
Originally Posted by Bryson
The best way to get more power out of any stock engine, for the least amount of money, is to advance timing and run 91 octane. The fixed timing on the 4.0L's will require an adjustable crank position senser. not that expensive, and not that hard to do.

If I want'ed to make the most power out of the 4.0L without going FI I would:

- Cold air intake
- Header
- 2.5" exhaust with flow through mufflers
- advance timing 2-4 degrees
- bump up the fuel pressure 2-3psi.
- Replace cap/rotor, plugs, and wires
- swap out the stock coil for a MSD SS (has far less resistance, and more voltage output than the normal cup style coils).

Theres not much you can do other than that to get more power without going stroker or forced induction.
you could also do some head work, like larger valves or bumping up the compression by shaving the head
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Unread 09-29-2006, 07:26 PM   #14
fitbmxseries1
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Quote:
Originally Posted by Ultimate157
Geese, I'm surprised no one has listed this one. It should be like the first thing anybody does to gain power.

Put a Type R sticker on your rear, driverside window. Make sure it is exactly 0.25 inches to the left, and 0.125 inches up from the molding in the bottom right corner.

This will surely add at least 20hp straight off the bat. Remember, the more stickers you have, the more HP you will gain! There's no telling how high you can get!
hmm where do i get these cool speed stickers i hear so much about?.......... OH nvm they sell them every where! walmart is a huge supplier of stupid type R stickers now.

id recomend starting off on a cold airinake then machine out the TB then do a bettery flowing exhaust. IMO i wouldnt buy a header the stock one works alright. OR for the cheapest way to make your jeep faster then hell!..... well actulay a free way to do it! remove seats carpeting doors..... cut out all extra metal.... drill holes in everything......... weight to power ratio oh yeah baby
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Unread 09-29-2006, 07:51 PM   #15
alexrule123
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Quote:
Originally Posted by fitbmxseries1
hmm where do i get these cool speed stickers i hear so much about?.......... OH nvm they sell them every where! walmart is a huge supplier of stupid type R stickers now.

id recomend starting off on a cold airinake then machine out the TB then do a bettery flowing exhaust. IMO i wouldnt buy a header the stock one works alright. OR for the cheapest way to make your jeep faster then hell!..... well actulay a free way to do it! remove seats carpeting doors..... cut out all extra metal.... drill holes in everything......... weight to power ratio oh yeah baby
don't forget removing the engine..that ought to save you around 500 lbs of dead weight
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