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Another update: 2nd dyno run showed no overheating, the additional oil cooler with another thermostate seemed to decrease the temperature significantly.


But: Peak hp was only 270 PS, one of the O2 sensors showed no data and the engine seems to run lean which may also cause overheating. Although there was no CEL the sensors will be changed and there will be another dyno run (and I will remount the water thermostate in the engine bay before).


If I really had only 270 PS the last time at Hockenheim that would be a wonderful excuse for my worse laptime :wink: I would have suspected something about 290 without cats and A/C compressor.


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