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Old 11-25-2006, 06:15 PM   #1
wrx_n00b
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Question Hydra emissions testing

Apologies for being a newbie. I bought a WRX from a guy this summer and he'd had a hydra put in. Now I need to get it emissions tested but to my knowledge the hydra is incompatible with OBDII required in my state.

Is hydra incompatible with the OBDII standard?
- If not, how can I set it up so it gives the proper readouts at the emissions testing station?

- If so, how can I revert to the stock ECU to pass emissions? I have the stock ECU with a piggy-backed u-tech, as well as the stock O2 sensor, but the harness for the O2 sensor appears to have been modded into a flat 5-pin clip for the hydra's wide-band sensor, replacing the square 4-pin clip needed for the stock narrow-band sensor. Do I need to make a 4-pin to 5-pin connector, or am I missing something?

Thanks for the help!
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Old 11-26-2006, 02:06 AM   #2
x99percent
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Quote:
Originally Posted by wrx_n00b View Post
- If so, how can I revert to the stock ECU to pass emissions? I have the stock ECU with a piggy-backed u-tech, as well as the stock O2 sensor, but the harness for the O2 sensor appears to have been modded into a flat 5-pin clip for the hydra's wide-band sensor, replacing the square 4-pin clip needed for the stock narrow-band sensor. Do I need to make a 4-pin to 5-pin connector, or am I missing something?
As long as the UTEC has a map for your mods/injectors, you shouldn't have a problem.

The connector for the factory O2 sensor should still be in place near the passenger shock tower...
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Old 11-26-2006, 11:11 AM   #3
offset
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Quote:
Originally Posted by x99percent View Post
The connector for the factory O2 sensor should still be in place near the passenger shock tower...
To elaborate just a little more if you need it, the 5pin connector is wired straight to the Hydra unit and there is still a stock connector for the factory O2 sensor under there. So you don't reuse the connector you are seeing, you just need to get the wideband sensor out of the way for now.

offset
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Old 11-27-2006, 10:57 AM   #4
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I made a post somewhere in this forum on what is needed to pass emissions. You can either keep your UTEC and run it just to pass emissions or you can drop in your OEM injectors and run the stock ECU for emissions time. It's important to keep the throttle in closed loop fuel control which is usually 50% TPS or less. Run the car through I believe it's 4 drive cycles to get all the readiness codes set. This will require you to get on the highway and cruise at 50+ mph for over 30 seconds at a time, pull over, turn the car off to reset the ECU and repeat 3 more times. This should have all the readiness codes set but 1 (Evap) which will allow you to pass your OBD2 scan.

Keep in mind to be legal you still need to install your catalytic converters.

Thanks,
Phil
www.elementtuning.com
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Old 11-29-2006, 07:00 PM   #5
wrx_n00b
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Smile Thanks

Thanks so much to everyone who's responded. I believe I now have a better understanding of what I need to do. I'll be trying to put my 02 sensor on this weekend to pass emissions next week. Hopefully by late next week I can be back to my wide-band 02 sensor and 4" dp!
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Old 11-29-2006, 07:07 PM   #6
wrx_n00b
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By the way, Phil, the previous owner told me my car was actually tuned by Element Tuning. Very nice job! She runs beautifully with the Hydra in there.
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Old 11-29-2006, 10:41 PM   #7
Element Tuning
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I'm glad you're happy.
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Old 12-03-2006, 06:52 PM   #8
wrx_n00b
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Default o2 sensor

Quote:
Originally Posted by Element Tuning View Post
I made a post somewhere in this forum on what is needed to pass emissions. You can either keep your UTEC and run it just to pass emissions or you can drop in your OEM injectors and run the stock ECU for emissions time. It's important to keep the throttle in closed loop fuel control which is usually 50% TPS or less. Run the car through I believe it's 4 drive cycles to get all the readiness codes set. This will require you to get on the highway and cruise at 50+ mph for over 30 seconds at a time, pull over, turn the car off to reset the ECU and repeat 3 more times. This should have all the readiness codes set but 1 (Evap) which will allow you to pass your OBD2 scan.

Keep in mind to be legal you still need to install your catalytic converters.

Thanks,
Phil
www.elementtuning.com
Phil,

A friend and I got under the car today to try to put in the O2 sensor, but now we're confused.

My understanding:
1) The sensor near the front passenger shock tower is a stock sensor and was not touched during installation of the Hydra.
2) The stock rear (narrow-band) O2 sensor was removed, but its harness was left in place (in the middle of the firewall about 10" from the top of the engine compartment), unused.
3) A new wire and clip was run from the Hydra down through the gear shift lever to the first straight exhaust piece behind the rear cat to connect a new wide-band O2 sensor.

I thought all I had to do was remove the rear wideband O2 sensor and reconnect the stock O2 sensor, but the sensor I have (which I believe to be stock) is about 12" long and is at least 7" short of the harness I thought it plugged in to, mentioned in #2 above.

Can you tell me what was actually changed when the Hydra was installed? The fact that the cable is so much too short makes me wonder if I'm trying to plug it in in the wrong place, but I haven't been able to find a good description of where I /should/ be plugging it in.

Thanks,

Mike
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Old 12-04-2006, 06:29 PM   #9
Element Tuning
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You have two oxygen sensors on the WRX. One is located in the exhaust header about 6" from the passenger cylinders. The other sensor is located in the third OEM catalytic converter. If you car is equiped with a non-OEM exhaust system it is common practice to relocate the rear oxygen sensor requiring the OEM wiring clips to be removed to allow enough length to actually install the sensor in the exhaust.

Most with the Hydra remove the rear oxygen sensor from the exhaust and unplug the sensor leaving the harness zip tied to the chassis. They will then utilize that oxygen sensor bung in the exhaust to mount the Hydra WB.
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Old 12-05-2006, 10:25 AM   #10
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Quote:
Originally Posted by Element Tuning View Post
Most with the Hydra remove the rear oxygen sensor from the exhaust and unplug the sensor leaving the harness zip tied to the chassis. They will then utilize that oxygen sensor bung in the exhaust to mount the Hydra WB.
They should also remove the front O2 sensor and replace it with a plug (or use an old dead sensor as a plug), as the Hydra doesn't power the front sensor... and an unpowered O2 sensor in exhaust = a dead sensor.
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Old 12-05-2006, 10:48 AM   #11
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^^^ Lack of power to the front O2 sensor is news to me. Phil, can you confirm this? If so, why wasn't this mentioned in the Hydra install documents? That'd really suck due to this possible omission. I've got 10,000 miles on mine with the Hydra in place.
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Old 12-05-2006, 12:51 PM   #12
Element Tuning
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I'm sorry but I thought I had made a notation on that in the documentation. I may have just posted and not actually edited the documents. You should remove the front 02 sensor with the Hydra EMS. I had not removed mine for some time but it still works and I just passed my emissions test. I'm guessing this is possible due to how hot the sensor gets being so close to the exhaust valves.
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Old 12-05-2006, 01:03 PM   #13
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So were is the BEST place to have your Hydra WB sensor installed???

I wonder if I still have that plug for the headers, hope so . . .
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Old 12-12-2006, 01:25 PM   #14
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I can't believe somebody sold a WRX with a Hydra still in it.
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