Dyno Database | BMW E9X M3
A dynamometer is such a critical tool in not just measuring power/torque, but it helps us evaluate the condition of a vehicle, diagnostics, data logging, and the changes of modifications. On a regular basis, we dyno test a lot of different vehicles. We'd love to use this thread to share all of the dyno data we acquire, specifically for the BMW E9X M3 and S65 platform! Hopefully we can use this as an avenue to exchange ideas on the most optimal dyno methods, as well as, sharing feedback on the various stages everyone's builds are at.We are looking forward to sharing our findings and seeing many of your results! So post away!
Vehicle: 2009 BMW E90 M3
Transmission: DCT
Modifications: Stock
Fuel: 93oct
Dyno: DynoJet 248x
Best Run
Worst vs Best Run
Worst vs Best Run - Data Logs
Analysis
I really wanted to start this thread to depict, not just what we typically see of a healthy stock E90 M3, but more so to depict the range between the worst and best run. When doing any type of dyno testing, it is so crucial to do numerous runs to allow the ECU to hit optimal targets, get the car warmed up, and to have more data to choose from. Unfortunately, we have seen way too many companies manipulate advertised dyno data by choosing the worst baseline run to compare with the best post-modification run. Our goal is to be transparent with everyone in what we post.
Notice how in the blue run, AFRs are richer, ignition is lower, and intake air temps are slightly less stable. The AFR and ignition targets are two pieces of evidence to explain the drastic difference in power. No other changes to the vehicle made other than assuring the vehicle reaches optimal targets with good airflow on the dyno.
Here is a screenshot of one of the many Ignition Target vs Manifold Pressure (Load) vs RPM Maps in the ECU.
Between 6500 to RPM Limit, at 90-100 load, the ECU targets between 28.6-31.4º Ignition.
Notice how the blue run hit as low as 25º and was a few degrees below the red run until redline, where it just hit 31.
Notice how the red run hit consistently between 29-31.4º Ignition, just as the ECU called to target.
Here is a screenshot of one of the Lambda (AFR) vs RPM Maps in the ECU. Lambda x 14.7 = AFR for Gasoline.
Between 6000 to RPM Limit, the ECU targets 12.9:1 down to 12.5:1.
Notice how the blue runs a bit richer, hitting 12.9:1 down to 12.2:1.
Notice how the red runs optimally, meeting 13.0:1 down to 12.5:1.
I hope this shares some insight on how crucial it is to get sufficient cool air flow to the vehicle during a dyno run, evacuating poor quality air, and most importantly, data logging more parameters beyond horsepower and torque.
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