Do O2 simms really work, plus a couple more Q's
Do O2 simms really work, plus a couple more Q's OK, heres the deal. My county just imposed a new type of emissions around here. Well, they don't sniff the car anymore, they just use a computer hookup and check the whole car through ODB II. Well, to me this means that I can run an off-road pipe with O2 simms if they really do trick the computer into seeing that everything is fine down there. Does anybody have any comments or suggestions about doing this? Does anybody else have this kind of emission testing in their area? I want the most power, <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> but I don't want a bunch of crap when I get inspected. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> Thanks in advance for the help!
TECH Enthusiast
Joined: Sep 2002
Posts: 612
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From: Brentwood, Ca
Re: Do O2 simms really work, plus a couple more Q's To answer your question, yes, the o2 simms do work. I have them installed on my car.
TWS- I had a question for you, why does my exhaust fumes smell rich? If you don't know, maybe your friend will. Thanks!
TWS- I had a question for you, why does my exhaust fumes smell rich? If you don't know, maybe your friend will. Thanks!
Re: Do O2 simms really work, plus a couple more Q's I'd say go to shop that has the air/fuel sensor as part of their dyno equipment. (I'm goning to do this next week myself, have no numbers on the hairdryer yet).
Do at least one dyno pull and have them tell you what's going on with your A/F ratio. Make sure to check it in both closed and open loop.
Do at least one dyno pull and have them tell you what's going on with your A/F ratio. Make sure to check it in both closed and open loop.
Staging Lane
Joined: Feb 2003
Posts: 76
Likes: 0
From: Houston, TX
Re: Do O2 simms really work, plus a couple more Q's You shouln't have a problem with the obd test. I have offroad y-pipe and running o2 sims and my car passed the obd test with no problem. I think your only problem will be the sound with no cats if the inspector is a "punk" he might not allow you to pass, but then again they are many inspectors' that just don't pay attention!
Re: Do O2 simms really work, plus a couple more Q's The way it was explained to me, the second set of O2 sensors (after cat) do not affect performance really at all. They are just monitors, sending information that is NOT acted upon. They will turn on your SES light, however, to get you to pull the code and see what they are trying to tell you. (because of them, the SES light is on now all the time since the blower <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" /> ) Now, the set before the cats, they will provide inputs that the computer acts upon to adjust fuel and timing, and will therefore affect emissions.
I'm not an expert, I didn't design the car, I may be full of <img border="0" alt="[barf]" title="" src="graemlins/gr_barf.gif" /> However, this was explained to me by an older, very knowledgeable gentleman who reads up on this stuff and then tests it.
So, I think the second set of O2 sensors will not influence your emissions output.
And finally, to answer your question directly: yes, the O2 simms are supposed to do the Jedi mind trick, telling computer that eveything is just fine and dandy and don't mind all my mods, they're really not there. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Can anyone else confirm or deny my take on this?
I'm not an expert, I didn't design the car, I may be full of <img border="0" alt="[barf]" title="" src="graemlins/gr_barf.gif" /> However, this was explained to me by an older, very knowledgeable gentleman who reads up on this stuff and then tests it.
So, I think the second set of O2 sensors will not influence your emissions output.
And finally, to answer your question directly: yes, the O2 simms are supposed to do the Jedi mind trick, telling computer that eveything is just fine and dandy and don't mind all my mods, they're really not there. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Can anyone else confirm or deny my take on this?
Re: Do O2 simms really work, plus a couple more Q's cool, so redjet, you have the same kind of testing that I have and you passed? cool deal. Guess I am going for an ORP! <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />
TECH Fanatic
Joined: Jan 2002
Posts: 1,471
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From: Houston, TX
Re: Do O2 simms really work, plus a couple more Q's Be careful. Here in Houston they have the same thing but they also do a visual inspection to see that they are on there. Of course you can over come this by just putting some gutted cats on there.
Mike
Mike
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Re: Do O2 simms really work, plus a couple more Q's As long as they don't do a visual inspection and you are using O2 sims you will be fine on the OBDII test with no cats. TWS pretty much explained the logic.
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Launching!
Joined: Nov 2002
Posts: 207
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From: S'port
Re: Do O2 simms really work, plus a couple more Q's Man I love Louisiana, smog test are nonexistant. Usually they have you hit your brakes, turn signals and honk your horn, if that much. The place I take mine, the guy has you bring your info inside and he fills out the paperwork and gives you the sticker to put on your damn self. For all he knows you may not even have a car out there.
Re: Do O2 simms really work, plus a couple more Q's </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NO F-BDY BS:
For all he knows you may not even have a car out there </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">LOL. When we used to have the roller tests here, the guy asked me if my '92 C4 was an 8-cylinder <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> I almost told him that I took out the LT5 and dropped in a Blue Flame <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
<small>[ April 11, 2003, 03:28 PM: Message edited by: Fulton 1 ]</small>
For all he knows you may not even have a car out there </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">LOL. When we used to have the roller tests here, the guy asked me if my '92 C4 was an 8-cylinder <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> I almost told him that I took out the LT5 and dropped in a Blue Flame <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
<small>[ April 11, 2003, 03:28 PM: Message edited by: Fulton 1 ]</small>
