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Old 03-03-2014, 07:09 PM   #1
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03 with a 4 banger

I have a 03 with a 4 cylinder. Live in Texas moving to California. What upgrades can I make on the motor & still pass emissions out west?

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Old 03-03-2014, 07:21 PM   #2
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There's not much you can do short of a supercharger that would make more than a few hp difference. Some people have reported small gains from switching the throttle body to one from a 4.0 engine and boring out the intake to match, but other than that it's pretty much snake oil.

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Old 03-03-2014, 07:30 PM   #3
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Tests show that the 4.0 throttle body does nothing until you get to around 4800rpm. The best thing you can do is put in a electric fan eliminating the mechanical clutch fan.
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Old 03-03-2014, 07:36 PM   #4
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I have a 03 with a 4 cylinder. Live in Texas moving to California. What upgrades can I make on the motor & still pass emissions out west?
Not many....! Maybe a new smiley sticker on top of the air cleaner box, but welcome to the people's republic.
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Old 03-04-2014, 09:27 PM   #5
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I've done almost every bolt on mod for a 2.5 and the one I was happiest with was the electric fan conversion. I wired a switch in the dash to be about to cut the fan off during water crossings and I use it regularly. Getting rid of the mechanical fan load off the engine helped a lot for throttle response.
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Old 03-04-2014, 11:17 PM   #6
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The best thing you can do is put in a electric fan eliminating the mechanical clutch fan.
There is no free lunch where energy is concerned. Removing the mechanical fan's load from the serpentine belt only shifts that load to the alternator which becomes harder to turn from the new electric fan motor's additional electrical load.
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Old 03-05-2014, 06:16 AM   #7
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The electric fan only draws current when its on and it's not that much. Maybe when idling in heavy traffic . Driving down the road the fan is not on and that's where the savings begin.
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Old 03-05-2014, 12:09 PM   #8
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Correct me if I'm wrong here but I also have an 03 with the red headed step child motor the 2.4 and my 2.4 has an electric fan already. It comes stock.
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Old 03-05-2014, 01:32 PM   #9
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I have an 06 with the 2.4. And my best advise would be to keep it stock... Emmisions laws are nuts in Cali. I'm sure mine which was purchased new in new York would have a rough time passing in Cali
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Old 03-06-2014, 07:30 AM   #10
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Correct me if I'm wrong here but I also have an 03 with the red headed step child motor the 2.4 and my 2.4 has an electric fan already. It comes stock.
I have the same and just wondering if you have any problems with 4th gear while going up hill?
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Old 03-06-2014, 09:25 AM   #11
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I have the same and just wondering if you have any problems with 4th gear while going up hill?
What size tires are you running? I'm stock on 31s and on the highway I'll only drop to 4th on the hill if I'm going below 65 otherwise I can do it in 5th
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Old 03-06-2014, 09:33 AM   #12
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Just remember that the 2.4L is the same motor in the original SRT4. Maybe cams? Possibly figure out a way to use the stock turbo? Only limited to imagination and funds
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Old 03-06-2014, 11:11 AM   #13
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Just remember that the 2.4L is the same motor in the original SRT4. Maybe cams? Possibly figure out a way to use the stock turbo? Only limited to imagination and funds
And the smog inspection every other year.
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Old 03-06-2014, 11:14 AM   #14
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And the smog inspection every other year.
there places that will pass all the Hondas with CELs because they have cat deletes around here... Where there's a will there's a way
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Old 03-06-2014, 12:51 PM   #15
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Just remember that the 2.4L is the same motor in the original SRT4. Maybe cams? Possibly figure out a way to use the stock turbo? Only limited to imagination and funds
This is an interesting read.

http://www.pirate4x4.com/forum/jeep-...-wrangler.html
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Old 03-06-2014, 01:29 PM   #16
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What size tires are you running? I'm stock on 31s and on the highway I'll only drop to 4th on the hill if I'm going below 65 otherwise I can do it in 5th
Im running 31s
Well if im in 3rd going up hill and i need to go into 4th once I shift my rpms drop way down to the point where I have to go back into 3rd gear.
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Old 03-06-2014, 01:44 PM   #17
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I have the same issue on steep hills. I just use 3rd. The hills are not usually that long arround here. Or I don't need to go that fast anyway. Here if it is that steep it is probably curvy also.
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Old 03-06-2014, 01:47 PM   #18
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Another thing you need to remember about smog in CA is that vehicles are put on a dyno and are required to run at certain speeds at certain rpm's in certain gears. The numbers off the machine are directly fed to the computer. This can be a problem if tires are over-sized and the Jeep has not been re-geared...so if that is you, either keep your your old wheels/tires, or make sure your gearing fit's your tire size/engine/transmission. Don't ask how I know...
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Old 03-06-2014, 02:04 PM   #19
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I have the same issue on steep hills. I just use 3rd. The hills are not usually that long arround here. Or I don't need to go that fast anyway. Here if it is that steep it is probably curvy also.
Ya but it sucks bc im either over revving 3000+ rpm in 3rd gear or dropping down -1800 rpm in 4th
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Old 03-06-2014, 02:22 PM   #20
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4bt!

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