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Old 02-03-2012, 01:52 PM   #11 (permalink)
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We have the same Jeep! Except mine spends a bit of time off the highway

The E-Fan thing ... You have two fan in there now - a mechanical fan on the right side of the jeep and an electric fan on the left. If you mess with the existing electrical fan, you're going to get a check engine light. You can, bypass the mechanical fan with an electric one too. Just remember to keep it cool - 4.0s don't like to overheat

Rake the front down. I lost a bit of mileage when I lifted the front of mine higher than the back. Reverse rake is no good. Most likely that's going to have a bit of sag in the back since the stock rear leaves aren't that great.

Next - I'd recommend some sort of way to put a plate on the bottom. I've heard from the guys that go crazy with the skid plates that having a lot of big plates on the bottom of the jeep lowers wind reistance. Maybe a big sheet of plexiglass underneath? Can someone else chip in here?

Also, you can block off the 7 grille openings on the front. I did that with tape on mine - I have an overactive fan clutch that is always engaged and I had to tape off the grille so the engine would get up to temperature!

Next, that Jeep looks like it has 31x10.5s or 235/75/15 tires on it - you don't want those. Too wide. Provided you don't mind the look of small tires - go with a 215 7515 or 205 75 15 on just a regular junkyard steel wheel 15x6. If you still want a tall looking tire, try to source an aluminum wheel from a Jeep liberty (they are 16'') and run 215 75 15. It'll get you a bit taller than stock (higher gearing) and still be skinny.

With all of that said, the 4.0 doesn't like to rev. Keep it at or below 2000 and it'll be happy.

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Old 02-03-2012, 04:00 PM   #12 (permalink)
Cd
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Will you be off roading in this truck ?
If so, consider a bicycle. It will be far less damaging to the Environment - air pollution, noise pollution, and overall destruction of everything you tear through.
It's great exercise and you get to see the outdoors the same way you do in a jeep, but at a slower pace that allows you to enjoy the things you likely would have run over in the jeep.
If you will not be off roading or even driving this thing off pavement, it just doesn't make any good sense to buy.
If you need it to haul stuff, or help someone move, consider simply renting a uhaul truck when the need arises. ( perhaps once every two years ?
)
Off roading with a bike can be just as much fun as using a jeep
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Old 02-03-2012, 04:23 PM   #13 (permalink)
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Get the Jeep, get prepared to spend a lot of time and money at gas stations. It's that simple.
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Old 02-05-2012, 11:44 AM   #14 (permalink)
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It's pretty common for people with 5 speeds to see 25MPG on the highway. If it's a 5 speed, it's going to have 3.07 gears in it.

With a 5 speed, I'd get the skinniest possible tires, keep the 3.07 gears, replace the oxygen sensors and swap out to more effieicnt fuel injectors. Chrysler used HORRIBLE injectors.
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Old 02-05-2012, 11:57 AM   #15 (permalink)
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Quote:
Originally Posted by Miller88 View Post
... With a 5 speed, I'd get the skinniest possible tires, keep the 3.07 gears, replace the oxygen sensors and swap out to more effieicnt fuel injectors. Chrysler used HORRIBLE injectors.
OP bbd1254 hasn't spoken up in this thread since the first post.
In fact he hasn't posted since then to any other ecomodder threads either.

Anyway Miller88, what would be a more efficient injector, for those who might need to know? Smaller ones?
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Old 02-05-2012, 05:17 PM   #16 (permalink)
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New generations of injectors atomize the fuel much better than older ones.
A lot of times you can jump up 2 or 3 injector generations and they are a drop in fit. Sometimes you need the newer style electrical plug.

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