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Old 02-17-2014, 07:10 PM
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Performance chips and air intakes

Has anyone installed any of those performance chips to improve HP or gas mileage? I'd think you'd also need to improve air flow using a performance air intake filter. Anyone who's tried one I'd appreciate what results were. Thanks

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Old 02-17-2014, 07:28 PM   #2
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Most don't do a good job of filtering out dirt

Many claim newer injectors with more holes but same flow rate at least improves lower rpm running and many of those claim minimal mpg gain especially those with 4.0 grand wagoners with trip computers

Theory is greater fuel atomization from 4 hole injectors

Early with old style injectors connectors up to some 1998 use Bosch 703 injectors for the upgrade
Newer some 98 and all 99 thru 2004 can upgrade to black Bosch 784 or green 789
703 and 784 found on neon and stratus
789 greens on 1998 1999 and 2000 Chrysler mini vans with 3.3 v6 engine

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Old 02-17-2014, 07:37 PM   #3
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Is not a 89 mustang, don't waste your money.
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Old 02-17-2014, 08:27 PM   #4
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this too is a question I had. I'm not looking to tear the tires off or get great gas mileage, middle of the road mileage is ok with me as this isn't my daily driver. I'm more looking at something that would help keep that automatic tranny near a usable power band without kicking the OD switch off. The previous owner had a K&N filter in it but would a stage 1 JET allow me to keep the power that I do have closer to a useful range rather than the stock program? I'm spit-balling on this but it's a question I've wondered when I'm lugging along and it seems I should have a smidge more power on those long uphill grades.
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Old 02-17-2014, 08:41 PM   #5
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^ usually folks say they want more power, but what you are describing really does scream wrong gearing.

What gear ratio is in your axles and what size are your tires?
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Old 02-17-2014, 08:41 PM   #6
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Opinions vary but here is a thread with some various reports on 4.0 injector swaps

http://www.jeepforum.com/forum/f13/d...p-how-1305456/
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Old 02-17-2014, 09:29 PM
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^ usually folks say they want more power, but what you are describing really does scream wrong gearing. What gear ratio is in your axles and what size are your tires?
its a 2004 Rubicon with Dana 44's, I'm running 33's. Or was this question for one of the other comments?
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Old 02-17-2014, 09:32 PM   #8
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I have a 5 speed but it sounds like you have the auto and I'm taking it you are 02/03 or newer which means you have a auto trans that is geared very deep (think 10th gear on a ten speed while only doing 5mph) what size tires do you have?? Gearing and an additional trans cooler will be you friend, along with regular fluid changes. Do a search for your transmission, there are plenty of threads on it.
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Old 02-17-2014, 09:36 PM
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I have a 5 speed but it sounds like you have the auto and I'm taking it you are 02/03 or newer which means you have a auto trans that is geared very deep (think 10th gear on a ten speed while only doing 5mph) what size tires do you have?? Gearing and an additional trans cooler will be you friend, along with regular fluid changes. Do a search for your transmission, there are plenty of threads on it.
i also have a 5 speed, 2004
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Old 02-17-2014, 09:41 PM   #10
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its a 2004 Rubicon with Dana 44's, I'm running 33's. Or was this question for one of the other comments?
Yeah sorry, didn't mean to sidetrack your thread but the comment was directed at rickow1.

I took the PO's K&N filter off the first weekend I had my rig. No difference I the than my throttle body is cleaner now. I don't think I believe in much of the "power adder" crap, but I do like the idea of a stroker, or a super charger. I just don't need either one yet. lol
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Old 02-17-2014, 09:44 PM   #11
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Well if you have a rubicon then you have 410 gears with 33" tires which is a little under geared. Probably simpler to my 373 with 31's, I had good power around town but on uphills at speed in 5th gear I was downshifting to stay with traffic. 456 will be your friends but make sure you are going to stay with 33's. the money you can spend on chips and everything else that won't work can and should be put towards gearing.
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Old 02-17-2014, 10:05 PM   #12
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X2 what 00 tj said. TJ have excellent stock intakes. The TJs cpu will eventually adjust itself with the Jet....wasted money. With the Jet chip, you pretty much have to use it only when wheeling and then remove it before the cpu adjusts. A total pita.

GEARING
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Old 02-17-2014, 10:16 PM   #13
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Want more power out of your 4.0? Regear, get one of these, or both. This supercharger is on my friend's TJ. Note the stock air box which provides plenty of air flow.



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Old 02-17-2014, 10:58 PM   #14
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Has anyone installed any of those performance chips to improve HP or gas mileage? I'd think you'd also need to improve air flow using a performance air intake filter. Anyone who's tried one I'd appreciate what results were. Thanks
They are a 100% waste of $$$ for the 4.0L engine. No exaggeration.

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