Author Topic: O2 Simulator, which actually works?  (Read 713 times)

Offline Doner

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O2 Simulator, which actually works?
« on: September 11, 2014, 05:58:44 AM »
For those of you who are Catless Down Piped...

Which of these solutions to the Aft O2 sensor actually works (for 04 FXT)? 

Thanks!

Non-Fouler - $5 bucks

http://www.evolutionm.net/forums/evo-how-requests-questions-tips/215795-5-o2-cheater-non-fouler-how.html

Straight O2 - $15 bucks

http://www.bigdaddiesgarage.com/straight-cel-fix.html

Angled O2 - $30 bucks
http://www.bigdaddiesgarage.com/angled-cel-fix-real.html

Mini-Cat - $50 bucks

http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html

-Doner
« Last Edit: September 11, 2014, 06:09:49 AM by Doner »

Offline bspec

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Re: O2 Simulator, which actually works?
« Reply #1 on: September 11, 2014, 09:59:56 AM »
Forgive me if it is different for the different years, but don't you just disable the DTC for the rear O2 in the tune when running a catless downpipe?
the bottom line is this, people just need to realize that when they buy cheap CO's [KW on down], they are buying cheap, poorly engineered shocks for the sake of having height adjust-ability. - whitetiger on legacygt.com

Offline Doner

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Re: O2 Simulator, which actually works?
« Reply #2 on: September 11, 2014, 07:06:46 PM »
I know romraider has a setting to disable the trouble code, but I thought that the ROM/computer still uses the aft O2 sensor to adjust fuel. So the annoying trouble code doesn't show up, which was mainly developed to pass emissions in states that only looked for a check engine light for inspection, but a/f ratio at idle in open loop still is terrible.

Additionally, there is an extensive post http://www.romraider.com/forum/viewtopic.php?f=40&t=8131 about how to find the code that uses the O2, how to zero it out, and adjust the limits from -50/50 to -5/5 in the ROM so that the ECU no longer uses it, but I do not have IDA ($1000) to open the code in the ROM.

I do believe this is year dependent and I thought that it was 05 ECUs and later that used the aft O2 sensor to adjust fuel. Mine is an 04, but I can not find anything confirming this and for a $5-15 fix, I didn't mind just using one of these.

Please steer me in the right direction.

Thanks!

Offline bspec

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Re: O2 Simulator, which actually works?
« Reply #3 on: September 11, 2014, 08:39:55 PM »
Interesting. I read through that whole thread. Never seen it before. I didn't see anything in there about using a defouler. I'd recommend posting up your rom number and requesting the definition. It seems to work for the others. I'll be doing this when I have some free time to work on the car.
the bottom line is this, people just need to realize that when they buy cheap CO's [KW on down], they are buying cheap, poorly engineered shocks for the sake of having height adjust-ability. - whitetiger on legacygt.com