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12-16-2004, 11:01 AM | #1 |
Scooby Specialist
Member#: 27108
Join Date: Oct 2002
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MWSOC
Location: Detroit-ish, MI
Vehicle:2004 STi 2004 A4 |
UTEC gurus! Question about MAP sensor + UTEC's FCD
Information:
When you plug a UTEC into your car, it is *always* screwing with the MAP sensor signal, even when the UTEC is in "stock" mode. The UTEC's FCD switch has two settings. From what I understand, this is how those settings work: Enabled - Moves factory fuel cut from ~17psi to ~20psi by tweaking the MAP signal. Disabled - Completely disables the factory fuel cut by clamping the MAP signal to ~13-14psi (you should be using the OLF fuel cut instead!). If you are using a UTEC, this is why the Manifold Pressure readings you see in DeltaDash are incorrect. My goal: I would like the UTEC to pass the MAP sensor signal through, unmodified (don't ask why.. just run with it ). Questions and possible solutions: Running the MAP signal "around" the UTEC isn't the best solution, as the UTEC uses the MAP sensor signal for load in its fuel and timing maps. Can I just "Y" MAP signal into both the stock ECU and the UTEC, and just not use the UTEC's MAP output? Does anyone have any input?
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12-16-2004, 11:09 AM | #2 |
Scooby Guru
Member#: 6124
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Location: Glendale Hts, IL, USA
Vehicle:2000 NFR AP1 S2000 '07 Honda FIT sport (5MT) |
You know what though... I've never noticed a difference in my load references (charge/air grams) with the UTEC in line or not. For me, frankly, having the MAP pass through would be nice since I can then properly do a DeltaDash log, and not just rely on the UTEC logs for accurate MAP readings.
Hell, with the proper isolator and spliter you can physically hardwire the harness to pass the unmodified signal back to the ECU. Jorge (RiftsWRX) www.ProjectWRX.com |
12-16-2004, 11:16 AM | #3 | |||
Scooby Specialist
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Join Date: Oct 2002
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MWSOC
Location: Detroit-ish, MI
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12-16-2004, 11:21 AM | #4 |
Citizen Mick
Member#: 27646
Join Date: Oct 2002
Chapter/Region:
NWIC
Location: Portland, Oregon
Vehicle:2003 Sleeved 2.5 Oil Dry Sump Goodness |
The ECU uses the MAP sensor reading for 2 things, one is boost control and the other is to trigger overboost fuel cut. With a reflashed ecu these two things may not be an issue. If no reflash, do you really want to supply the correct MAP signal to the ECU?
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12-16-2004, 11:27 AM | #5 | |
Scooby Guru
Member#: 6124
Join Date: Apr 2001
Chapter/Region:
MWSOC
Location: Glendale Hts, IL, USA
Vehicle:2000 NFR AP1 S2000 '07 Honda FIT sport (5MT) |
Quote:
Jorge (RiftsWRX) www.ProjectWRX.com |
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12-16-2004, 11:37 AM | #6 | |
Scooby Specialist
Member#: 27108
Join Date: Oct 2002
Chapter/Region:
MWSOC
Location: Detroit-ish, MI
Vehicle:2004 STi 2004 A4 |
Quote:
For some reason, I don't think it will be as simple as T'ing off the harness.. does anyone know how to make/find a simple isolated splitter? |
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12-16-2004, 02:58 PM | #7 |
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If you cut the MAP sensor harness wire (B135 Pin 8) on the UTEC and solder the wire going to the connector to the matching PCB connector pin this should give the ECU the unaltered MAP signal.
Just double check my thinking and pin number before trying. regards Pete (TurboXS) |
12-16-2004, 03:49 PM | #8 | |
Scooby Specialist
Member#: 27108
Join Date: Oct 2002
Chapter/Region:
MWSOC
Location: Detroit-ish, MI
Vehicle:2004 STi 2004 A4 |
Quote:
I also have a way to logically do the same thing you're suggesting, but without cutting any UTEC wires (I *really* don't want to do that!). EDIT: Followup: Just tapping the signal worked without a hitch. Both the ECU and the UTEC get a good MAP signal. Last edited by x99percent; 01-11-2005 at 11:40 AM. |
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