intake manifold absolute pressure

Ryan123 said:

4023
this map is intake manifold absolute pressure map?

Click to expand...

Looking at the data in your screenshot, no, this is most likely not an intake manifold absolute pressure (MAP) map.

Here's why:

• The values start at 600 in the lower load/RPM area and scale up to 25000+ at high load/RPM. These values are far too large to represent manifold pressure directly (MAP is typically 0–2550 mbar or 0–255 kPa in most ECUs).
• The pattern — low values at idle/low load, increasing progressively with both RPM (columns) and load (rows) — is more characteristic of a fuel injection quantity or torque/load request map.

This looks more like one of the following:

• Desired injection quantity map (mg/stroke or mm³/stroke) — very common in diesel ECUs
• Driver demand / torque request map
• Airflow or charge target map (if gasoline)

To help you identify it precisely, could you share:

• ECU type (Bosch EDC17, MED17, Siemens, Delphi, etc.)?
• Vehicle make/model/engine/year?
• Which tuning software are you using (WinOLS, ECM Titanium, etc.)?
• The map address or label name if available?

With that info I can tell you exactly which map this is.

Ryan123 said:

x y not converted

Click to expand...

If your X/Y are all “raw coordinates/not converted” (not converted), that also happens to explain why the values don’t look like MAP: many ECUs’ scaling requires conversion using calibration parameters (for example, converting the row/column coordinates from raw to kPa/mbar, or applying a linear/nonlinear conversion afterward).

But based only on what you said about “4023” and “X/Y not converted,” I still can’t confirm with 100% certainty whether it is an IAT (intake air temperature) or MAP (intake manifold pressure) map.

Provide the following information and I’ll be able to determine it directly:

• What are the “row/column headings” of this table? (For example: X 轴=RPM、Y 轴=mg/stroke or wording such as mbar/kPa)
• Take any 3 points from the table: for example, what is the value at low RPM and low load, what is it at medium load, and what is it at high load?
• What software are you using to read it (WinOLS/ECM, etc.)? Is there a “unit/conversion” field or a calibration formula provided in the guide?
• If the table is MAP, the units you would usually expect are kPa/mbar; what is the range of the values in this table (minimum–maximum)?

You can also send another screenshot: capture the complete X/Y coordinates and the range of the table values (don’t capture only a single cell). Then I can give you a definitive answer based on common ECU calibration formats.

Gemini said:

Looking at the data in your screenshot, no, this is most likely not an intake manifold absolute pressure (MAP) map.

Here's why:

• The values start at 600 in the lower load/RPM area and scale up to 25000+ at high load/RPM. These values are far too large to represent manifold pressure directly (MAP is typically 0–2550 mbar or 0–255 kPa in most ECUs).
• The pattern — low values at idle/low load, increasing progressively with both RPM (columns) and load (rows) — is more characteristic of a fuel injection quantity or torque/load request map.

This looks more like one of the following:

• Desired injection quantity map (mg/stroke or mm³/stroke) — very common in diesel ECUs
• Driver demand / torque request map
• Airflow or charge target map (if gasoline)

To help you identify it precisely, could you share:

• ECU type (Bosch EDC17, MED17, Siemens, Delphi, etc.)?
• Vehicle make/model/engine/year?
• Which tuning software are you using (WinOLS, ECM Titanium, etc.)?
• The map address or label name if available?

With that info I can tell you exactly which map this is.

Click to expand...

x y 没经过转换
med17.9.9 tuning by winols

Ryan123 said:

x y have not been converted
med17.9.9 MAP (intake manifold pressure, actual or target) tuned by winols

Click to expand...

MED17.9.9 + WinOLS usually has these characteristics (especially in the case you mentioned where X/Y has not been converted at all):

1) X/Y The physical quantity usually would not directly be on the scale of an entire table such as “raw 600~25000”

• If the MAP uses a kPa/mbar scale, it is generally around ~20~250 kPa (or the converted mbar range), not direct values such as 20,000~30,000.
• Of course, “raw count values” also exist, but they usually correspond to a fixed conversion formula, and the table will be closer to the ECU's internal calibration relationship.

2) The values you mentioned earlier gradually increase from low load/low RPM to high load/high RPM
This shape is more like a demand/metering type (torque request, injection quantity target, air quantity target, EGR/load-related) or an equivalent quantity internal to the electronic control system, rather than the units of the “pressure itself.”

Conclusion (before axis/scale information is available):
Based solely on “4023” and the information you have provided, I am more inclined to think it is not a direct MAP (intake manifold absolute pressure) table。

But to confirm 100%, I need you to provide two key pieces of data:

• in WinOLS, the table's row/column headings (what is the X-axis and what is the Y-axis), even if they are raw and unconverted (for example: X-axis = Load or RPM, Y-axis = mg/stroke or raw kPa, etc.)
• Take a screenshot of the table's X/Yaxis arrays and minimum/maximum values in the table (or simply list the first 3 and last 3 coordinate values)

Just paste the table's WinOLSAxis name + array + value range in , and I can tell you exactly whether it is MAP, MAF/air target, torque request, injection quantity/torque-related, etc.