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914 Turbo Question

  • MarkGraham
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7 months 20 hours ago - 7 months 12 hours ago #18312 by MarkGraham
914 Turbo Question was created by MarkGraham

When oil temps are hot (above 95 °C) and I use full throttle (115%) and full rpm (5750 rpm, that's the hard limit of my constant speed prop). Under these condiions MAP rises to just above 40 and then drops to 35, then it jumps up to 40 and back down again. This oscillating behavior continues indefinitely and is accompanied by proportional power surges.
Testing on the ground shows that the wastegate opens and closes in sync with the MAP needle.
Anyone knows what's causing this?

Please help

I didn't find the right solution from the Internet

Last edit: 7 months 12 hours ago by admin.

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7 months 3 hours ago #18318 by RobSeaton
Replied by RobSeaton on topic 914 Turbo Question
I would connect to the TCU and do a test flight in the "LOG" mode. then you can examine the TCU data by exporting to Excel.
Maybe the airbox temp is going too high? The TCU is programed to reduce MAP if the airbox temp goes over 80c.

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