![]() This parameter is useful in determining the overall health of the vehicle.įor the 02-05 WRX this value will range from 0-16 and for other EJ model Subarus it will range from 0-1. The DAM, or Dynamic Advance Multiplier, adjusts the vehicle’s overall timing based on its current and historic knock readings. This will negatively impact how the car runs and could prevent you from reaching target boost. Actual vacuum at idle will vary from car to car (it is typically around -10 for these Subarus) but if you’re only seeing -2 at idle, it’s safe to say you likely have a vacuum leak somewhere. The monitor can also help determine whether a vacuum leak exists. More details on these maps and these issues can be found here. Higher altitudes and any mechanical issues should be considered when concluding whether you are under/overboosting. Many vehicles have off the shelf high wastegate and low wastegate maps that address vehicles under/overboosting. You can then compare the boost values in your data log to the target in the map notes to determine whether you are under/overboosting. We typically recommend a third gear pull to gather this data. It is normal for boost to taper down as you approach redline. Note that this target range will only be achieved during wide open throttle through mid-range RPM with load on the engine. STIs have different boost targets within the same map depending on the drive mode selected. You should consult the map notes to determine the target boost value for your specific map. Negative numbers indicate the car is in vacuum. Positive numbers indicate the intake manifold’s boost pressure. When it comes to these critical sensors, always use OEM parts from a Subaru dealer or a re-seller of genuine Subaru OEM parts.īoost is the manifold absolute pressure minus the current barometric pressure measured in PSI (or bar if you prefer to configure the units in metric). Definitely replace the front o2 if engine or turbo damage has ever occurred. If yours are still original, and you have mileage beyond 100k, replacing these sensors would be recommended. MAF and o2 sensors are typically on their way out after ~100k miles. As always, having parts installed not designed to work with the map you are running could also cause high positive fuel trims. A failing fuel pump, dirty fuel injectors, or bad MAF or o2 sensors would all be good starting points to address the problem. There are several potential culprits in this situation. Positive corrections beyond 10% mean the ECU is adding lots of fuel. Other potential issues could be a bad MAF sensor, failing o2 sensor, or you may have a map flashed that is not designed for your intake or injectors. This would most likely be due to a leak in the intake tract. Negative corrections beyond 10% mean the ECU is pulling lots of fuel. The closer to zero the better, but generally, the acceptable range would be +/- 10%. Negative numbers indicate that fuel is being removed. Positive numbers indicate that fuel is being added. This monitor shows a percentage correction for fueling. Let’s take a look at each of these monitors individually in more detail. There are some differences in newer model year (2015+) WRXs, but for EJ equipped Subarus, these monitors include: A/F Learning 1, Boost, DAM, Fine Knock Learning, and Feedback Knock. There are some key monitors within the default list that can help gauge whether there are any issues present. If you’re unsure of how to gather the data from your vehicle, check out COBB U Episode 17 covering how to data log.Īfter you’ve recorded your data log, it will be time to examine the results. Below are some of the key monitors that can help determine you engine’s overall health. Luckily, an in depth knowledge isn’t required for a basic wellness check. That’s quite a few! Having an in-depth knowledge of how your engine works, and the affects added modifications have, allows troubleshooting of more complex issues. Here is a link to the Full Monitor List which defines each monitor. ![]() This list of parameters will help troubleshoot the most common issues of the specific vehicle with which the Accessport is used. The following is a general guide covering some key parameters on your COBB supported Subaru.Įvery Accessport is automatically setup with a default log list. At first glance, the amount of monitors and the sheer volume of data can be a bit overwhelming. Completing a data log and reviewing the results can help troubleshoot or identify any issues that may be present. This is especially important anytime tuning changes or hard part modifications are made to your vehicle. It’s never a bad idea to examine what’s going on behind the scenes to determine how well your car is running. By Kyle on Subaru – Data Logging Overview
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