So one problem that I have not figured out yet in my GTR data collection setup – All of the pressure sensors on the cold side are Honeywell PX3 sensors (which are the cheaper brass ones). I had those sitting here in a box so I decided to use them. They are all working as expected.

For the EGBP sensors I decided to try out the Honeywell PX2 sensors, which are a stainless steel contained sensor 150psia, 0.5-4.5V, 5V powered 1/8NPT sensor. (PX2AN2XX150PAAAX).

When I first powered them up and connected them to the Motec, I noticed they were reading about 12.1psia sitting with the car off (while the should have been reading about 14.2psia). I thought perhaps I had done the calibration wrong, but I double checked that and it looked correct. (0.5V = 0psia, 4.5V =150psia).

Honeywell does make a .25v-4.75V version as well, so I double checked the sensors, and tried it out just in case the was a label mistake. That went too far the other way.

The graph below shows all 4 EGBP sensors over 23 dyno runs. You can see that on the pre-turbine side one of them drifts up and down over 15psia. (I took this drift into account when making the graphs by the way).

I suspect this drift is temperature related, as the sensors even with those cool T1 baffles are going to get warm.

I am probably going to just switch these out for the T1 ones, as Tony Palo seems to have good success with those.

I am still puzzled by the static offset of all 4 when cold, and by almost the same amount. They were all 4 ordered new from Digikey.