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09-27-2005, 04:14 AM | #1 |
Scooby Newbie
Member#: 36075
Join Date: Apr 2003
Location: Calgary, Alberta, Canada
Vehicle:2004 STi 2.65L GT35R Hydra |
Is there a reason the Front O2 sensor is before the turbo?
I know that most O2 sensors don't depend on where they are located.
But is there soemthing unique about the factory front "Wide-range" O2 sensor that requires it before the turbo? My reason for asking is becuase my new setup was made just for a Hydra and the front O2 sensor bung has been welded shut. I'm now having issues with the Hydra and want to put the stock ECU in, but the only conveniet place I have for yjr O2 sensor now is in the Downpipe behind the turbo. Should there be a problem putting it here? thanks
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09-27-2005, 08:53 AM | #2 |
Scooby Specialist
Member#: 21267
Join Date: Jul 2002
Location: Eats, roots and then leaves
Vehicle:STI, EWG 8cm Green UTEC/ECUtek/WI & SD tune |
Jay,
FWIW I have a spare bung if you want me to weld it on in the stock location. FOC I could also redrill the hole and tap a new thread. PM me if you want to go the above. |
09-27-2005, 11:56 AM | #3 |
Scooby Newbie
Member#: 36075
Join Date: Apr 2003
Location: Calgary, Alberta, Canada
Vehicle:2004 STi 2.65L GT35R Hydra |
Thanks, actqually the bung is still there and I could probablu get the plug out as it was just lightly welded, my My whole headers in wrapped in about an inch thick of exhaust wrap. I don't really wan to pull the header and revove the 8hours labout it took to do the wrap just to test the Stock ECU for a few minutes.
I'll just put it behind the turbo and see how it works. Jay |
09-27-2005, 02:32 PM | #4 |
Scooby Specialist
Member#: 33410
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: wishing i was somewhere else
Vehicle:08 wrx dgm |
i don't have an answer to your question but i do know the JDM twin scroll setup has the o2 sensor a few inches from the turbo in the downpipe.
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09-27-2005, 05:12 PM | #5 |
Scooby Newbie
Member#: 36075
Join Date: Apr 2003
Location: Calgary, Alberta, Canada
Vehicle:2004 STi 2.65L GT35R Hydra |
Thanks. Thats useful to know.
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09-27-2005, 08:29 PM | #6 |
Scooby Specialist
Member#: 36852
Join Date: May 2003
Location: North West
Vehicle:2004 STI |
Just a guess, but O2 sensors work best only when they are at a properly temp range. Closer to the exhaust manifold == hotter so the ECU doesn't have to turn on the heater element in the sensor to get an accurate reading?
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09-27-2005, 09:17 PM | #7 |
Scooby Guru
Member#: 7327
Join Date: Jun 2001
Chapter/Region:
NWIC
Location: Seattle, WA
Vehicle:2008 Mazdaspeed3 2006 Wrangler Sport |
You want the O2 as close to the cylinders as possible to ensure quick response time.
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09-28-2005, 05:51 PM | #8 |
Scooby Newbie
Member#: 36075
Join Date: Apr 2003
Location: Calgary, Alberta, Canada
Vehicle:2004 STi 2.65L GT35R Hydra |
OK,
To answer my own question, it appears that it works in the downpipe. It does seem like the AFR takes a bit longer to respond than usual, but it's not a huge problem. This now seems to confirm that all the drivaility issues I was having were with the hydra. Defective unit is the likely cause, but I won't know for sure until I send it back to Element and Phil checks it in a car. With regards to the sensor being as close to the combustion chambers as possible, it makes sense but many 02 sensors are not. Most aftermarket ECUs that run in closed loop (Hydra, AEM) for WOT tuning don't have the O2 Sensor after the turbo. Whether that matters, I don't know. I've also been advised by many (PDX) that if it is too close the the turbo the reading are innacurate. I think becuase of heat, but not sure. thanks Jay |
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