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Old 10-12-2008, 01:05 AM   #1
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mpg upgrades

I drive a 97 tj with a 4" lift and 32" tires. its a 4 cylinder, and ya know gas milage is shitty. I hear about the intakes, exhaust, chips, and throttle body spacers. Just wondering if spending the money is worth it. when doing intake work is it really any better to get a cool air intake or just get a k&n filter. Also is the upgrades noticeable in power (with a 4 cylinder). what have yall done?

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Old 10-12-2008, 01:25 AM   #2
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if you want a good mileage, don´t drive a jeep.

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Old 10-12-2008, 01:32 AM   #3
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not looking to get out of the jeep just askin if the upgrades are worth anything?
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Old 10-12-2008, 02:26 AM   #4
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No, really, none of those items you mention will help in the least... save your $$$. The best way to increase the power from the 2.5L engine is to install lower ratio gears in your axles. But I'd wait until you get to 33" tires and then install 4.88 gears, replacing your existing 4.10 gears. 4.88 would be too low of a ratio for 32" tires but 4.56 for your 32" tires (which would be a nice combo) would not make enough difference to make it worth the $1200 or so cost of regearing.
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Old 10-12-2008, 03:32 AM   #5
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i disagree because of MY EXPERIENCE. I did bunch of engine junk, i was getting 13 mpg stock, now with 6" of lift and 35s i'm getting 18 mpg corrected.
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Old 10-12-2008, 11:14 AM   #6
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damn 18 mpg with 35's? is it a 4 or 6 cylinder, and what all have you done? I heard from a guy that if i took the intake off of a 4.0 tj and put it on my 2.5 ill get more power, anybody tried it?
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Old 10-12-2008, 11:51 AM   #7
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If you take youe clip pins off your intake and hold onto them and then put a 4.0 in and then replace the pins... you will get more power....lol

Sorry... i couldnt resist....lol

i'm all ears also on any mpg upgrades
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Old 10-12-2008, 11:57 AM   #8
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I have a 4.slow but i got 17.1 on the last tank. with stock 3.73s, 33s, and the 3 speed auto. go get the correct speedo gear there cheap and really easy to install. you should get a 36 tooth gear for 4.10s and 32s. clean air filter and fresh fluids in your axles and trans/tcase. when i added a electric fan and got rid of my clutch fan i gained 1 or 2 mpgs as well. also i know its hard since you have a 4banger but try and just cruise 65 to 70 on the freeway.

97tj your buddy most likely just swapped his throttle body. you cant swap intake manifolds
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Old 10-12-2008, 12:12 PM   #9
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haha yea i meant to say throttle body. So im still wondering if any of those upgrades are gonna do anything?
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Old 10-12-2008, 12:18 PM   #10
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Quote:
Originally Posted by 97tj.jeepinit View Post
damn 18 mpg with 35's? is it a 4 or 6 cylinder, and what all have you done? I heard from a guy that if i took the intake off of a 4.0 tj and put it on my 2.5 ill get more power, anybody tried it?
I have an 00 4.0 5speed. I did a custom 3" intake, i bored out the throttle body so its even all across, I also got a 2.5" catback with a flowmaster muffler, electric fan conversion, hard top, 3.73 stock diff gears, 6" of lift, 35x12.5 tires, 29 tooth speedo gear to correct it.. i think thats it for the moods that would affect the mpg. And no my rig has no problems turning the 35s with the gears i have. Many people say that once you get anything above 33" tire you need to regear otherwise you loose 5th gear. Its simply not enough power at these low rpms. Well my rig has no problems so its either the mods or the people are wrong but either way, some one is wrong.

As for the throttle body dude, its a common upgrade to put a 4.0 tb on a 2.5 engine. Do a search and you'll find lots of stuff.
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Old 10-12-2008, 12:27 PM   #11
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haha yea i meant to say throttle body. So im still wondering if any of those upgrades are gonna do anything?
No, I assure you they really won't help. Even Jp magazine tried putting the 4.0L engine's throttle body onto a 2.5L engine like yours seeing if it would help with power or economy and it did nothing... and they actually lost some mpg. You're going to hear all kinds of people swearing they did such-and-such to their Jeep and got magical mileage increases but they're normally young naive guys who aren't exactly using the best scientific methods to know the true results of what they did.

If there were easy ways to increase your TJ's mpg, the factory would have already included them because they are under INTENSE pressure by the EPA to improve their overall fleet economy. The only sure ways to improve your fuel economy are to slow down and keep your tire pressure up where it should be.
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Old 10-12-2008, 12:35 PM   #12
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Jerry, JP magazine also did a comparison between 10 intakes and they show gains but you dont want to believe that either. Also if the factory wanted to squeeze out ever bit of power from the 4.0 the few thousand offroaders would be happy but the rest of the doll playing freaks might not be. Many people complain about whistling noise caused by aftermarket free flow intakes, others complain about exhaust noise, others complain about drivability.. etc. It adds up. The factory has to think what is the best for mass production, not what fits YOU or this person over there better.
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Old 10-12-2008, 12:42 PM   #13
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If there were easy ways to increase your TJ's mpg, the factory would have already included them because they are under INTENSE pressure by the EPA to improve their overall fleet economy.


And car companies and oil companies arent in bed together to make money either. So they would LOVE for you to have to pull into that gas station less then normal.

The rest of it... i got no clue... lol im the guy on the other side of the pump whinning about having to fill up again...

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