Logging ECU data for 2.5 non-turbo? What about "IAM"? What value do you have?
I've been using Romraider logger to occasionally view ECU parameters on my 2007, 2.5 non-turbo with 4AT over the past few years. One of the parameters is IAM (Ignition Advance Multiplier). It can be read by scanners and programs that are able to access the Subaru-specific ECU data. (E.g., Romraider, FreeSSM, dealer's Subaru Select Monitor, and similar tools.)
I understand that IAM is related to ignition timing control in the ECU. It's a correction to the base, or default, ECU timing advance to compensate for knock across a broad range of engine speeds and loads. Depending on whether the ECU is an earlier (16 bit) or later (32 bit) version, the IAM can be as high as 16 or 1, respectively.
Some discussions I've looked at related to IAM seem to suggest that an IAM of less than the maximum 16 or 1 might indicate a possible problem, but these are typically in forums about ECU tuning, and where the tuner might be setting this as the target.
Based on Romraider logs I have from a few years ago and more recent checks, the IAM in my 07 is between 0.65 and 0.75 running regular 87 octane fuel that has up to 10% ethanol content.
I'm looking for comparison with other stock 2.5 non-turbos, preferably 2006-2009, using regular (87 octane) fuel, that are not experiencing problems, to determine whether or not my engine's IAM is within a typical range.
I have looked at logs posted in various threads; most don't include IAM. The ones I found with IAM included are for turbo engines.
If you have a 2006-2009 2.5 non-turbo, and can view the IAM, or have access to this data, then I'd appreciate if it could be reported here so we can determine what is, and what isn't, typical.
Or, if you can provide clarification of what the IAM is all about and, more specifically, what is normal or typical in a stock 2.5 non-turbo, then that would also be welcomed.
I've been using Romraider logger to occasionally view ECU parameters on my 2007, 2.5 non-turbo with 4AT over the past few years. One of the parameters is IAM (Ignition Advance Multiplier). It can be read by scanners and programs that are able to access the Subaru-specific ECU data. (E.g., Romraider, FreeSSM, dealer's Subaru Select Monitor, and similar tools.)
I understand that IAM is related to ignition timing control in the ECU. It's a correction to the base, or default, ECU timing advance to compensate for knock across a broad range of engine speeds and loads. Depending on whether the ECU is an earlier (16 bit) or later (32 bit) version, the IAM can be as high as 16 or 1, respectively.
Some discussions I've looked at related to IAM seem to suggest that an IAM of less than the maximum 16 or 1 might indicate a possible problem, but these are typically in forums about ECU tuning, and where the tuner might be setting this as the target.
Based on Romraider logs I have from a few years ago and more recent checks, the IAM in my 07 is between 0.65 and 0.75 running regular 87 octane fuel that has up to 10% ethanol content.
I'm looking for comparison with other stock 2.5 non-turbos, preferably 2006-2009, using regular (87 octane) fuel, that are not experiencing problems, to determine whether or not my engine's IAM is within a typical range.
I have looked at logs posted in various threads; most don't include IAM. The ones I found with IAM included are for turbo engines.
If you have a 2006-2009 2.5 non-turbo, and can view the IAM, or have access to this data, then I'd appreciate if it could be reported here so we can determine what is, and what isn't, typical.
Or, if you can provide clarification of what the IAM is all about and, more specifically, what is normal or typical in a stock 2.5 non-turbo, then that would also be welcomed.