Rotax 914 Max MAP
in 912 / 914 Technical Questions
8 years ago
Team,
The manual says that at take-off performance MAP is 39.9 in HG. It also says "Due to the control behavior an overshooting of the manifold pressure is possible. But within 2 seconds this pressure has to stabilize within the allowance."
Are are my questions:
1. I am sometimes seeing values like 40.5 in HG for a minute or so, is that normal or a concern?
2. I suppose the TCU is monitoring the MAP pressure too, and would open the waste gate if too high, therefore it should not matter how high it could be or where the throttle position is: if TCU software detects 40 in Hg then it opens the waste gate. I suppose my TCU and my waste gate work because when I bring the throttle back, or at cruise, I can maintain 35 in HG therefore the waste gate must be slightly opened then. So is the TCU using different sensor than the MAP sensor (Kavlico P4055-30A) going to the G3X (actually the GEA 24) and could this be simply differences in calibration or accuracies between the two sensors? Or, if the same sensor is used, then could the G3X decode the value differently than the TCU?
Thanks.
Best regards,
Jeff
The manual says that at take-off performance MAP is 39.9 in HG. It also says "Due to the control behavior an overshooting of the manifold pressure is possible. But within 2 seconds this pressure has to stabilize within the allowance."
Are are my questions:
1. I am sometimes seeing values like 40.5 in HG for a minute or so, is that normal or a concern?
2. I suppose the TCU is monitoring the MAP pressure too, and would open the waste gate if too high, therefore it should not matter how high it could be or where the throttle position is: if TCU software detects 40 in Hg then it opens the waste gate. I suppose my TCU and my waste gate work because when I bring the throttle back, or at cruise, I can maintain 35 in HG therefore the waste gate must be slightly opened then. So is the TCU using different sensor than the MAP sensor (Kavlico P4055-30A) going to the G3X (actually the GEA 24) and could this be simply differences in calibration or accuracies between the two sensors? Or, if the same sensor is used, then could the G3X decode the value differently than the TCU?
Thanks.
Best regards,
Jeff
