SENT Protocol MAP sensors.

I need some advice with a Single Edge Nibble Transmission manifold pressure sensor. We're running 3 identical cars in a race series where the series mandates these MAP sensors, the race series scrutineering body supply us the Life Racing ECU's which came with a firmware package to accommodate these specific VW MAP sensors. We're having an issue on one car where the boost control is bugging out, and after a horrible race weekend, we're desperate to get it figured out. It seems as if the boost control isn't activating (which it is) and the car only makes spring pressure on certain parts of the track.

We at first thought it to be a wiring issue to the boost control solenoid, thats when we depinned the ecu and ran a wire directly from the ECU to the solenoid, we changed out solenoids, MAP sensors, ecu calibrations between cars, ECU's, wiring harnesses, wastegates and turbo's, but to no avail.

It seems like the sensor output signal is freezing or something, where it doesn't update what MAP is in reality.

We have no leads at this point and any suggestions would be highly appreciated.

Have you reviewed any datalogging to ascertain or isolate what is happening? In your post it sounds like you only speculate on what is occurring than referencing any data.

We have extensively reviewed our loggs, with the limited functionality of the ECU it doesn't have features like Motec do to log pin voltage, so we can not see if it is turning off the boost control solenoid, it creates a MAP target but doesn't reach it, if it's creating the target, all the conditions which need to become true for it to enable the solenoid are true. We also installed a stiffer spring to the gate to get the base pressure higher to reducte the deficit for when it doesnt match the target and our MAP reading for base pressure was unchanged, whereas when MAP reacted to the target pressure, it would be about 200mBar higher because of the stiffer spring.

So it does in fact seem like a MAP reading error.

The pin voltage for a sent sensor wouldn't help, as the pin voltage jumps between 300mv and 4300mv to generate a serial signal. These signals occur on a 3us clock time.

Your relying on the input that it is attached to to read the data and checksum correctly to turn the data into a usable signal.

If I am understanding your reply, your boost sensor is not reading correctly, and didn't show a change in value with an increase in spring pressure, but the MAP sensor did? So the boost sensor (that the boost control strategy is likely based on) is not reading as expected? Does it respond at all like a pressure sensor would? is the sensor wired to the correct input type?