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Old 03-22-2011, 09:29 AM   #1
corey_dyck
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Member#: 98427
Join Date: Oct 2005
Chapter/Region: W. Canada
Location: Winnipeg, MB
Vehicle:
2006 STI
Blue

Default Tapping ECU for datalogger - what wires?

I'm trying to wire in my RaceTechnology DL1 datalogger into my 2006 STI for track and occasional autocross use. I use this logger extensively in my S2000 for autocross, but I'm having a hard time figuring out which wires to tap into for basic information. Can anyone recommend anything? Even search terms will help if the info is out there, I can't find anything here aside from engine logging with various tuning software/hardware packages.

Things I really want to log:
1. Engine RPM
2. Throttle position

Nice to have, if it's even possible:
3. Steering wheel angle. There is a stock sensor, but I'm guessing it's a pulsed/digital output and not some simple change of voltage. I found some interesting things plotting actual steering angle vs. needed steering angle (calculated via GPS turn radius and wheelbase) on the S2000.

I'll also have the following standalone sensors wired into gauges as well as the logger:
4. Innovate LC-1 wideband O2 sensor in the downpipe
5. Boost pressure
6. Oil pressure

Any recommendations for finding signals for 1-3?
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Old 03-22-2011, 01:14 PM   #2
boost junkie
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Location: Silver Spring, MD
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2012 WRX
GD Race Car in progress

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Quote:
Originally Posted by corey_dyck View Post
I'm trying to wire in my RaceTechnology DL1 datalogger into my 2006 STI for track and occasional autocross use. I use this logger extensively in my S2000 for autocross, but I'm having a hard time figuring out which wires to tap into for basic information. Can anyone recommend anything? Even search terms will help if the info is out there, I can't find anything here aside from engine logging with various tuning software/hardware packages.

Things I really want to log:
1. Engine RPM
2. Throttle position

Nice to have, if it's even possible:
3. Steering wheel angle. There is a stock sensor, but I'm guessing it's a pulsed/digital output and not some simple change of voltage. I found some interesting things plotting actual steering angle vs. needed steering angle (calculated via GPS turn radius and wheelbase) on the S2000.

I'll also have the following standalone sensors wired into gauges as well as the logger:
4. Innovate LC-1 wideband O2 sensor in the downpipe
5. Boost pressure
6. Oil pressure

Any recommendations for finding signals for 1-3?
Do you have the factory wiring diagrams?
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Old 03-22-2011, 03:21 PM   #3
Big C
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Join Date: Jan 2001
Chapter/Region: MAIC
Location: NOVA
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2000 RSTI Rally Car
2012 STI SWP Hatch

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Be very careful when tapping wires for gauges and dataloggers. I just wrapped up the installation of a RacePak IQ3 logger dash in my rally car and there are many sensors that cannot be tapped without affecting the calibration/signal returned. I believe that the throttle pedal angle is one of them - but do some research before you believe me.

If you don't have the full wiring diagrams downloaded from the Subaru site now would be a good time - without that you are completely in the dark.

-C
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Old 03-23-2011, 09:32 PM   #4
corey_dyck
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Location: Winnipeg, MB
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2006 STI
Blue

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I do have the factory manuals. But they're pretty vague on what wires are what. Example:
http://i55.tinypic.com/wwgftt.jpg
Which wire to tap into for throttle position? There are 6. Obviously the ground won't help but that still leaves 5.

2nd example:
http://i54.tinypic.com/2mxegaq.jpg
Which wire to tap into for an engine RPM signal?

I'm aware of the possibility of causing issues. The DL1 uses a high-impedance connection (I'm no electrical guy, just repeating what I've heard) that reduces the chances of the original signal being affected too drastically. I'll test these connections out in a safe environment away from children and track-goers before going on the street or track. I understand that accidentally putting 5 or 12V into the throttle position sensor could have some... umm... interesting results.

My S2000 was remarkably easy to figure out from the manuals and a little insight from some other racers on s2ki.com.
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Old 03-24-2011, 09:46 AM   #5
Big C
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2000 RSTI Rally Car
2012 STI SWP Hatch

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When I hooked up my dash I used the wire that went to the cluster for the tach from the ECU since I was eliminating the old cluster. You could try tapping that one. Look at page WI-61 of the 06 Impreza FSM and it should be B134-23 coming out of the ECU to the tach on the STI.

For the pedal - go to the engine diagnostics section for the STI engine and go to page "EN(STI)diag-21" - there is a chart that tells you what each wire is and it's voltage range- I believe the wire you need is B136-17 from the ECU.

I would suggest testing the voltage before and after you tap it to make sure you aren't screwing anything up. And you will be on your own to calibrate anything that you log since sensor/ecu calibrations aren't in the FSM.
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Old 03-24-2011, 11:08 AM   #6
corey_dyck
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Location: Winnipeg, MB
Vehicle:
2006 STI
Blue

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Nice, thanks! I didn't think to check the diagnostics section! No problem calibrating, most sensors need that anyway. Did you try to tap the steering angle sensor at all? I'll backprobe it at the connectors once I get into the job a bit more.

Any recommendations for where to put the logger in a car with a full interior? So far my best idea is under the passenger seat.
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