Science Abuse Posted March 7, 2012 Report Share Posted March 7, 2012 So, it's exhaust time on the Subaru. Nothing special needed, just replacing the 10 year old, 150k system with something that doesn't leak. I'm not buying any pre-made shit, too much money for too little value. I'll be making one. It will be easier to produce with longer down tubes that come together in a Y behind the trans. Right now, they come together in front of the trans, and that is where the O2 is. Will moving the O2 to a slightly cooler spot, possibly with more internal volume, confuse the computer? 2002 Outback 2.5 SOHC N/A. Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted March 7, 2012 Report Share Posted March 7, 2012 Call Dyno Brian. My thought would be the farther away the leaner it would make it, but that is just a guess Quote Link to comment Share on other sites More sharing options...
Cordell Posted March 7, 2012 Report Share Posted March 7, 2012 In theory an O2 sensor's switching will be affected, as in a computer's programming judges the delay of the signal based on how far downstream it is. Now will this actually cause any issues? Likely not, but its dependent on how the computer is set up, and I highly doubt its that precise. So long as it's a heated O2 sensor (most are) I wouldn't worry about it, if its post catalyst in theory it should be the same distance from the catalyst for similar reasons, but again I highly doubt some adjustment will make much difference. Quote Link to comment Share on other sites More sharing options...
craig71188 Posted March 7, 2012 Report Share Posted March 7, 2012 If the system is sealed (as it should be) no problem w/rich/lean. The only issue should be time to reach operating temp. Being OBD II with a heated sensor, this should not be a problem other than the heater may be "on" longer. No real problem there other than a possibly a somewhat shorter heater life from more use than originally designed. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted March 7, 2012 Author Report Share Posted March 7, 2012 That's reassuring... though I should mention that the move will be from 18" to 24". No cats will be between the cylinders and O2. Quote Link to comment Share on other sites More sharing options...
Skinner Posted March 7, 2012 Report Share Posted March 7, 2012 why not find a wrx or sti take off for cheap? Quote Link to comment Share on other sites More sharing options...
Nate1647545505 Posted March 7, 2012 Report Share Posted March 7, 2012 Shouldn't be a problem, keep the sensor between 11 and 2 oclock, 10 and 3 in worst case. Don't use a solder connection on the signal wires if you're extending the harness. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted March 7, 2012 Author Report Share Posted March 7, 2012 why not find a wrx or sti take off for cheap? A) won't fit, I have no turbo and my car is longer. B) you underestimate how cheaply I can do an exhaust. Shouldn't be a problem, keep the sensor between 11 and 2 oclock, 10 and 3 in worst case. Don't use a solder connection on the signal wires if you're extending the harness. I plan on getting a readily available extension harness. I hate wiring, no way I'm trying to splice anything. Quote Link to comment Share on other sites More sharing options...
Cordell Posted March 7, 2012 Report Share Posted March 7, 2012 Cutting and splicing some extra wire into the O2 sensor really keeps with your theme of saving money. Even if you paid me $5 to extend the O2 it'd be cheaper then buying a harness. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted March 7, 2012 Author Report Share Posted March 7, 2012 I hate wiring... I didn't say "I don't like it", I said I hate it. Honestly, I'm looking at serviceability. I want changing things to go smoothly. Quote Link to comment Share on other sites More sharing options...
Crossle Posted March 7, 2012 Report Share Posted March 7, 2012 Pics when your done. I want to see this, it has sparked my interest. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted March 7, 2012 Author Report Share Posted March 7, 2012 Pics when your done. I want to see this, it has sparked my interest. Well... look under an H6. I think I'm going to end up mimicking that pretty closely, the gaps I'm following were made for their plates.... no cats though. http://legacygt.com/forums/attachment.php?attachmentid=96095&d=1296872687 Quote Link to comment Share on other sites More sharing options...
copperhead Posted March 11, 2012 Report Share Posted March 11, 2012 If its a post cat o2, why replace it with a simulator? http://www.amazon.com/s?ie=UTF8&keywords=o2%20simulator&rh=i%3Aaps%2Ck%3Ao2%20simulator&page=1 Its possible to make one yourself with a resistor, just have to research it. This way, no wiring to screw with, no drilling and tapping, just plug it into the harness and zip tie it somewhere safe. The after cat o2 doesn't adjust the F/A, just makes sure the cat is functional so who cares. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted March 11, 2012 Author Report Share Posted March 11, 2012 If its a post cat o2, why replace it with a simulator? http://www.amazon.com/s?ie=UTF8&keywords=o2%20simulator&rh=i%3Aaps%2Ck%3Ao2%20simulator&page=1 Its possible to make one yourself with a resistor, just have to research it. This way, no wiring to screw with, no drilling and tapping, just plug it into the harness and zip tie it somewhere safe. The after cat o2 doesn't adjust the F/A, just makes sure the cat is functional so who cares. Didn't really have a plan to replace the post-cat o2. Good to know there's an option that won't throw a CEL, though! Quote Link to comment Share on other sites More sharing options...
copperhead Posted March 11, 2012 Report Share Posted March 11, 2012 Didn't really have a plan to replace the post-cat o2. Good to know there's an option that won't throw a CEL, though! oh, I thought that was the one you were talking about Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted March 11, 2012 Author Report Share Posted March 11, 2012 Nahhh just because I drive a subaru doesn't mean I give a damn about OBDII. Quote Link to comment Share on other sites More sharing options...
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