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Good thinking! making the rotating mass lesser on a turbo engine might help with spool-up as it revs up quicker.
Light-weight pistons and rods help as well in that train of thought.
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Light rods and pistons would surely make it rev even quicker for sure.That might be an option later on.For now I will use the stock rods with Raceware bolts.
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Brave of Armin to run on the track with 1,3 bar!
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He had ran up to 1.8 bar in a long distance race once without knowing it.The boost gauge still showed around 1.3 bar.Later he found a small hole in the wastegate senseline.All other gauges showed normal operating temps - i.e. CHT,oil temp and afr...and still drove home after the race from the A-1 ring back to Ulm 400km IIRC...
with stock cast bus pistons!