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Old 08-28-2015, 09:30 PM   #1
racer_smokm1
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Default wide band to o2 wiring question

Ok so I am in the process of getting the car all setup and will be running tactrix 2.0 on it. I am trying to get everything ready before I buy and "marry" the software to the car. so here is my question.

I have a innovate LC-1 that I will be using and I want to but the wideband in place of the factory rear o2 sensor. I have been told that you can hook up the wideband into the factory harness to go to the ECU and run data logging through the ECU. I just need to know how to marry the two together. What wires from the wideband need to go to what wires on the factory harness. Any help would be greatly appreciated.

oh yeah its an 05 wrx harness on a 99 impreza
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Last edited by racer_smokm1; 08-28-2015 at 09:59 PM.
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Old 10-09-2016, 10:55 AM   #2
CarmelValleyWRX
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pretty sure you can just wire it up to a headphone jack to plug into the side of the tactrix 2.0 or wire it to pin 18 (correct me if im wrong) of the obdII port.
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Old 10-15-2016, 11:59 PM   #3
Samuelh88
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i would also like to know about this as presently i am running the wideband on its own usb and logging that through romraider logger, although its a pain and sometimes wont connect. it would be much easier to log this through the ecu.
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Old 11-16-2016, 09:48 PM   #4
CarmelValleyWRX
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i looked into it further when i got my AEM UEGO. turns out you have to get a serial to usb converter and wire it in to the AEM. then plug it into the laptop alongside the openport 2.0

it works great. but it would be nice if we could figure out how to use the ADC in the open port to use the 0-5v out on the wideband. now i have all kinds of wires and crap when i datalog.
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Old 11-17-2016, 04:17 PM   #5
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Quote:
Originally Posted by CarmelValleyWRX View Post
i looked into it further when i got my AEM UEGO. turns out you have to get a serial to usb converter and wire it in to the AEM. then plug it into the laptop alongside the openport 2.0

it works great. but it would be nice if we could figure out how to use the ADC in the open port to use the 0-5v out on the wideband. now i have all kinds of wires and crap when i datalog.
Correct. But have you seen this thread? http://forums.nasioc.com/forums/show....php?t=2805570

I'm using it to log through the ecu with the android app btssm. works perfect

Last edited by my9999; 11-17-2016 at 04:19 PM. Reason: spelling
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Old 11-07-2017, 02:47 AM   #6
Discordance
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So I know this is a dead thread but did the rear o2 option work better than just running the connector to the tactrix cable?
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Old 11-16-2017, 09:13 PM   #7
CarmelValleyWRX
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the way i got it working the best is to wire it into an unused analog pin and make a new logger def for it. i did a TGV delete so i had 2 spare 0-5v inputs. i used one for wideband 02 and one for an EGT sensor. i renamed the parameter for TGV position voltage left and right to "wideband" and "EGT" and changed the scaling and offset to read the correct values. even edited in a version of EGT in degrees F and C.

the serial thing was crap. its one more thing to plug into the computer and it would randomly drop out.
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Old 12-02-2017, 02:10 PM   #8
boi12
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Can someone explain this a bit further? I'm interested in wiring it to the rear 02 but how do I set that up in rom raider?
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Old 12-02-2017, 04:35 PM   #9
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basically most wideband gauges have a 5v output that changes voltage in stride with the gauge reading. you have to find a sensor on the car that uses 5v that you can get rid of so you can replace it with the wideband. the TGV sensors output a 5v signal and have a logger parameter already so its easy to read the voltage level. then its back to high school math with y=mx+b formula to scale the voltage into the right units then offset it the right amount in the logger definition.

this is part of my logger definition but im running a jdm ecu with Carberry so yours might be slightly different.

</ecuparam>
<ecuparam id="E180" name="TGV WIDEBAND Right" desc="">
<ecu id="3D04EA4605">
<address length="2">0x21750</address>
</ecu>
<conversions>
<conversion units="AFR" expr="x*0.000152588+10" format="0.00" />
</conversions>
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Old 12-02-2017, 04:39 PM   #10
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Thank you for replying. im going to try setting this up using the rear 02 tonight ill report back with results
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Old 05-09-2018, 10:00 AM   #11
FUNGC
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Has anyone tried using their Rear O2 as an input that can chime in on this? Apparently the Rear O2 input can only read 0-1.5V, unlike the rest of the 0-5V inputs like the TGV's/Fuel Level Sensor Inputs. Which I don't have due to having a JDM EJ207.

I have only found one post confirming this found below.

http://www.romraider.com/forum/viewt...=6430&start=15

My concern is with sampling size. If the ecu reads in 0.02V increments as stated in the thread above, I will have a lot less accuracy when I scale my WBO2 from 0-1.5V than 0-5V in the logger definitions.

Any help will be appreciated.
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Old 05-09-2018, 01:14 PM   #12
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I'm curious to see the answer on this.

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Old 05-09-2018, 02:57 PM   #13
point78
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Quote:
Originally Posted by FUNGC View Post
Has anyone tried using their Rear O2 as an input that can chime in on this? Apparently the Rear O2 input can only read 0-1.5V, unlike the rest of the 0-5V inputs like the TGV's/Fuel Level Sensor Inputs. Which I don't have due to having a JDM EJ207.

I have only found one post confirming this found below.

http://www.romraider.com/forum/viewt...=6430&start=15

My concern is with sampling size. If the ecu reads in 0.02V increments as stated in the thread above, I will have a lot less accuracy when I scale my WBO2 from 0-1.5V than 0-5V in the logger definitions.

Any help will be appreciated.
Quote:
Originally Posted by Homemade WRX View Post
I'm curious to see the answer on this.


Are you guys asking if the rear O2 can read 0-5v?

I've had my 0-5v wide band running through the rear O2 since the CCF rom was first released. (Rear O2 signal, B135, 08 wrx)

Works great.

Edit: just noticed this is in the "open source" section. I'm using the Cobb access port, so I dunno??

Last edited by point78; 05-09-2018 at 03:06 PM.
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Old 05-19-2018, 02:29 AM   #14
cosmo135
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I've got a formula worked out for my AEM Wideband that is being logged through the Rear O2 on my JDM Version 7 ecu. It is correct that the Rear O2 (atleast on 02-03 WRX's) can only read 0-1.25V. The readings come out extremely well, however whenever the car is on it cycles from the correct reading down to 9.29 and back and forth.. this only occurs when the motor is running. When the ignition is just on it sits at the correct value. I'm gonna try to reground the gauge at the ECU and see if that corrects it but I'm not too sure if it will.


<conversions>
<conversion units="AFR" expr="8.11*x/50+9.92" format="0.00" />
</conversions>
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Old 06-04-2018, 03:11 PM   #15
no694terry
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i have my 0-5v ethanol sensor tapped to my rear o2 and it works fine.

That AEM conversion doesnt look right. I just did one a while back and it was a 10:1 to 20:1 AFR meter and the conversion was more like "x/50*2+10"

some widebands, like the Innovates have a separate lambda output thats 0-1ish volts for replicating o2 sensors
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Old 06-07-2018, 10:07 AM   #16
pcampbell
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So are you wanting to use your wideband to replace the rear o2 basically? So the car doesn’t flip out not having a rear o2?
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Old 06-11-2018, 02:18 PM   #17
FUNGC
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Quote:
Originally Posted by cosmo135 View Post
I've got a formula worked out for my AEM Wideband that is being logged through the Rear O2 on my JDM Version 7 ecu. It is correct that the Rear O2 (atleast on 02-03 WRX's) can only read 0-1.25V. The readings come out extremely well, however whenever the car is on it cycles from the correct reading down to 9.29 and back and forth.. this only occurs when the motor is running. When the ignition is just on it sits at the correct value. I'm gonna try to reground the gauge at the ECU and see if that corrects it but I'm not too sure if it will.


<conversions>
<conversion units="AFR" expr="8.11*x/50+9.92" format="0.00" />
</conversions>
Cosmo135, can you confirm if your Version 7 JDM Rear O2 Input reads 0-5V or 0-1.25V? I have a Version 8 JDM ECU and I want to do the same thing.
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