914 Low Power on Takeoff Attempt

Caig....go and get the new 4.0 software for all the channels in the TCU.  Download the log files.  There is a record of your peak values in each channel.  You have not said if you have any warning lamps amber or red?  A change like you show would have given you some data. 

Cheers

on the 914 there is a temp sensor in the airbox, it records in the TCU.  if you exceeded the temp limit it will show on the log files.

Cheers

Craig E Maiman wrote:

Hi Des,

Unfortunately, the guy who finished the engine installation (a deep regret) didn't put the manifold pressure measurement in the right place, it's on the airbox and also didn't use a differential fuel pressure gauge. I do need to fix those things.

One thing that has happened recently was the shroud around the turbo air filter became loose and a small percentage of the filter is visible, so some air into the filter is coming from inside the cowling, not the NACA duct. I didn't think this was a huge issue, so I've held off fixing it until I had the bottom cowling off.  Maybe that's the cause?

Thanks!,

Craig

Oh wow!

I wonder did he use that plugged port on the airbox for the MAP sender? If so, I bet he didn't give you the plug. Here’s a link to the airbox temp sensor Peter C & I are using, works well on the G3X, I’m sure you’ll find an equivalent locally.

I’m amazed Rotax does not include an airbox temp indication sensor in the normal scope of supply, having a TCU function that automatically reduces power without warning or indication of activation is frankly unacceptable, think Boeing MCAS on the 737MAX.

https://raceworks.com.au/sensors/sensors-motorsport-air-temp-sensor/1-8-npt-motorsport-air-temp-sensor/ 

The loose filter housing could well be an issue, it could also possibly explain the intermittent nature of the problem if it moves around a bit. Well worth exploring a fix for it anyway even if it is not the cause of your power loss.

Good luck & cheers,

Des.

I'll get the latest TCU SW (I think that's called BUDS, right?) and download the data.  Should be interesting.

Des, The whole engine install turned into a shitshow..  Didn't do it properly and didn't give me any leftover parts..

I'll get it straightened out..

Thanks,

Craig