Once I had put some miles on my engine and was comfortable that is was broken in, I figured it was time to head to the dyno. My reasons for this were twofold. Of course I was curious to find out how well the engine was producing torque and power. But I also wanted to make sure that there were no big "holes" in the power band, that the air/fuel mixture was safe, and that there was not any detonation going on at high rpm's that I could not detect inside the car. For the engine's maiden dyno run I went to Dick Chiang's excellent DynoSpot Racing facility in Mountain View, California. Dick owns a Dynojet inertia dyno and he has extensive experience testing E30 M3's (including his own 2.5L). The results for my engine were obtained on a beautiful day, about 75°F with low humidity. We did runs in both third and fourth gear, starting at 1500 RPM and going all the way until the rev limiter cut in at 7800 RPM. Two of the dyno charts are shown below: | |
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