Wideband integration into EGR

I

Ifrit

Registered User
Good Morning Everyone,

It is that time again for me to seek more information from you guys that I cannot seem to find. After 2 days of hunting around on the forums I find plenty of mentions about hooking up the analog output form a wideband into the cars computer EGR pin if it was deleted so that datalogging is possible through QH but was unable to locate any solid information on how to complete this.

What I need to know is what wire off of a 94/95 do I need to splice in order to get my wideband to output to the QH for datalogging. I will figure out the BE/QH side on my own I am just after the physical connection side for the car.

Thank you in advance.
 
Do 94/95 even have EGR? I thought they dropped it after 92 & went to a 3 way catalyst, or is that only for shipped to Canada cars?
 
I am really surprised know one has offered up this information yet. Does anyone know what the wire is "called" that I'm looking for? I understand it is related to the EGR and I can tap into it at the computer but I do not know what I am hunting for.
 
DOUG H said:
Pin #27 at ECU is EGR input. You can refer to you EVTM to confirm color(s)
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Hey! Thank you for the response. I am then assuming the wire I am after is "Pressure Feedback EGR Sensor input". I will check and confirm if it works out for me.
 
PFE input wire at pin 27 is brown/light green. Circuit 352. The EVR,(egr vacuum regulator), is pin 33, brown/pink wire.
 
I will be wiring into pin 27 and seeing how it goes. Going to be little time before I do it as I am waiting to upgrade my wideband to the Bosch LSU 4.9 wideband sensor.
 
Ifrit said:
I will be wiring into pin 27 and seeing how it goes. Going to be little time before I do it as I am waiting to upgrade my wideband to the Bosch LSU 4.9 wideband sensor.
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I've never heard of anyone using the EGR pin to log wide band when using QH and BE. Why would you do that when it's already set up to log a wideband ? That said, I have heard of using a MAP sensor to log boost thru the EGR wiring on cars that were equipped with EGR. Mine didn't have EGR, so I couldn't do it.
 
When I was dyno tuning Turbo Coupes (older version of EEC-IV) we found that wide band didn't work as well as the narrow band O2 sensor at Turbo outlet. Wide band switching speed from stoic to rich & stoic to lean was too slow. At the time we thought it was because of the higher ex temps at the turbo compared to EGR press feedback 0-5 volt.
 
David Neibert said:
I've never heard of anyone using the EGR pin to log wide band when using QH and BE. Why would you do that when it's already set up to log a wideband ? That said, I have heard of using a MAP sensor to log boost thru the EGR wiring on cars that were equipped with EGR. Mine didn't have EGR, so I couldn't do it.
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I have found that when trying to datalog with my wideband using a serial to usb into BE, the refresh rate of the wide band is slower. For what ever reason if i connect the innovate motorsports sensor to their logworks software it refreshes on par with my gauge.

Attempting to wire it into the EGR is how I am going to try and speed up the refresh rate of the AFR in my datalog to get a more accurate recording. I know the LC-1 can output instantly through analog but I am using a MTX-L so the best I can achieve is 1/12sec which is faster than that I am seeing right now.
 
Ifrit said:
I have found that when trying to datalog with my wideband using a serial to usb into BE, the refresh rate of the wide band is slower. For what ever reason if i connect the innovate motorsports sensor to their logworks software it refreshes on par with my gauge.

Attempting to wire it into the EGR is how I am going to try and speed up the refresh rate of the AFR in my datalog to get a more accurate recording. I know the LC-1 can output instantly through analog but I am using a MTX-L so the best I can achieve is 1/12sec which is faster than that I am seeing right now.
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I'm using MTX-L and it works fine. I used to have an LC-1 that was hit or miss and was constantly shutting off and rebooting.
 
David Neibert said:
I'm using MTX-L and it works fine. I used to have an LC-1 that was hit or miss and was constantly shutting off and rebooting.
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Very interesting, you don't find it updates slower when comparing it to the gauge and the logworks software? I am also wondering if you are running on the older LSU4.2 or did you swap to the LSU4.9 wideband?
 
Ifrit said:
Very interesting, you don't find it updates slower when comparing it to the gauge and the logworks software? I am also wondering if you are running on the older LSU4.2 or did you swap to the LSU4.9 wideband?
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Yes it uses the LSU 4.9 sensor. Screen shot of Amazon order.
 

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David Neibert said:
Yes it uses the LSU 4.9 sensor. Screen shot of Amazon order.
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So depending on the age you could be on the LSU 4.2 or the newer LSU 4.9. Both of my MTX-L's were the older LSU 4.2 style so I am doing the swap to the LSU 4.9. its just a cable and the new style sensor. Very easy to swap. Apparently the LSU 4.9 is more accurate and lasts longer.

For those who are curious/unsure of which one you have you can measure the connection plug on the sensor or check the logworks programer. If it is not listed and your MTX-L is on FW 1.03 or older you are for sure using an LSU 4.2. see image attached.

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Like I said earlier, I have the LSU 4.9 . Here is my spare sensor.
 

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David Neibert said:
Like I said earlier, I have the LSU 4.9 . Here is my spare sensor.
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Hey sorry for the odd language, made it sound like I did not read that you were on the LSU 4.9, I more so added all that information for anyone that might stumble by.

Have you had any issues with your current setup? Early sensor fail or inaccurate readings?
 
Ifrit said:
Hey sorry for the odd language, made it sound like I did not read that you were on the LSU 4.9, I more so added all that information for anyone that might stumble by.

Have you had any issues with your current setup? Early sensor fail or inaccurate readings?
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No, ever since switching from long tubes back to medium length headers with an innovate heat sink, I haven’t had to replace a sensor. Seemed like I was replacing them every 6 months when I had long tubes.
 

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