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07-21-2010, 12:52 AM | #1 |
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UEL headers , CEL
i've been researching for different UEL header setups for my07 2.5i and was noticing that people are getting CELs and some dont.
Is there a good setup to avoid getting CEL? if you're not getting a CEL on your 2.5i, can you post your setup? thanks! -JC **my bad, if this has been asked a million times, i swear i searched!
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07-21-2010, 09:52 AM | #2 |
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only way to be sure of no MIL is to have it tuned
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07-21-2010, 10:57 AM | #3 |
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For a lot of people it's only because they new UEL headers they bought have thinner walls so they let more heat escape and the CEL the car is throwing is because temp. at the catalytic converter are too low and not high enough for maximum efficiency. If that's the CEL that's being thrown either powder coating or wrapping the headers will prevent this.
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07-21-2010, 02:17 PM | #4 |
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Ceramic coating won't prevent the P0420 DTC. Been there, tried that. Wrapping them will prevent it under some environmental conditions, but not all of them.
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07-21-2010, 04:57 PM | #5 | |
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Quote:
I'd have to assume that wrap and having the cat immediately follow the header would be the best setup for these newer cars (07+, right?) |
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07-21-2010, 07:37 PM | #6 |
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so wrapping the headers fixes the CEL issue?
I'd have to assume that wrap and having the cat immediately follow the header would be the best setup for these newer cars is this true? |
07-21-2010, 09:09 PM | #7 |
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That last part was supposed to be posted as a question. I was making an assumption, and waiting for someone to confirm or deny that.
I've heard it's the '07+ cars that are finicky with the o2 sensors, so that was another question in there. |
07-21-2010, 09:39 PM | #8 |
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I think it's a head and flow issue. Controlling the heat does seem to help the situation. However, there's no guarantee that wrapping the header will prevent the DTC.
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07-21-2010, 11:19 PM | #9 |
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yeah ive got my headers coated, wrapped and then coated again and i got a CEL two days ago and its starting to go on and off!
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07-21-2010, 11:57 PM | #10 |
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hmmm...
so is the CEL just randomly coming off? do you guys have to reset the ECU to take it off or does it go away on its own? |
07-22-2010, 09:12 AM | #11 | |
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Quote:
The is also why you should have UEL custom made for 2006+ cars to have the cat as close to the stock location as possible. |
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07-22-2010, 11:44 AM | #12 |
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@GEE-OTTO - so basically, wrapping the headers and having the cat as close to the stock location as possible will prevent the CEL?
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07-22-2010, 01:35 PM | #13 | |
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Once you start modding the exhaust there is no miracle cure. You can do some things, such as wrapping the exhaust, that make it more or less likely that you'll keep the ECU happy. There are no guarantees. |
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07-22-2010, 02:19 PM | #14 |
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ok..
burble with CEL or no burble, no CEL... right? |
07-22-2010, 02:20 PM | #15 |
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Or you could get a top-quality EL header and disable the DTC in the ECU and have both power and no DTC. Best of all worlds.
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07-22-2010, 04:34 PM | #16 |
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but i want the rumble though..
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07-22-2010, 04:37 PM | #17 |
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07-22-2010, 05:01 PM | #18 | |
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damn people these days.. <---- subie newbie, but not ricer. |
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07-23-2010, 09:54 AM | #19 | |
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Quote:
however you can get this tuned out the user kero had this done for his 2.5i with UEL setup and he has no MIL's |
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07-23-2010, 10:06 AM | #20 |
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Hey youre not alone in that desire I see both sides EL and UEL this is owner choice. The stock is a great EL header but the other ones work well and give you some bottom end grunt. I think Willitay has a graph showing the gains of the EL over the UEL over stock I want to say there was 5-10 hp gains at high RPMs EL vs UEL but I personally don't drive in the 5K RPm range regularly nor do I consider my 2008 Legacy 2.5i a "perfomance" vehicle it is a sporty one but no way a performance car so I can live with the boxer rumble and without 7 extra ponies up top but some are performance driven and opt for the EL to squeeze ever HP they can out of their EJ251/3. Again owner choice and the EL still comes with the MIL like the UEL |
07-23-2010, 10:15 AM | #21 |
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^ thanks! i could live without extra hp as well and get the rumble.
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07-23-2010, 10:44 AM | #22 |
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07-23-2010, 10:58 AM | #23 |
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nah, i dont drag or any kind of race.. just dd all day..
thanks for the tips! |
07-23-2010, 12:04 PM | #24 |
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I had gotten the P0420 cat deficiency cel with my UELs and trackpipe, I had a local tuner edit the ECU MAP to remove that code all together, has never come back up since and it allowed me to pass inspection now and forever, granted they don't check under the car.
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07-23-2010, 12:18 PM | #25 |
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It is true that the only way to permanently clear the DTC is to eliminate it via reflash. That's how the track pipe boys do it. Welding a cat in a near stock location is next to impossible because the stock cat is actually integrated into the exhaust manifold. I have a high flow cat in mine, but I'm not running any o2 sensors. I had my tuner take out the codes, and I have not had any issues at all.
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