Crickets possibly fuel pressure target?

[Tromatic]

Link posted in this thread talked about similar problems with other vehicles.

Cold start squeaky squeak

My work on the MS3 platform with the chirp/crickets under the hood.

If you take some time to datalog the twins and use some basic troubleshooting (check off the fact that it's a brand new car with less than 1k miles so the likelihood for a mechanical problem/bad HPFP is basically NIL), start looking into the software and note how the system operates.

Anywhere from 650 rpm to ~1300 rpm I can hear the chirp, and when it's chirping the ECU is in a mode that's targeting 4 MPa of fuel pressure (fixed setting). If you touch the throttle just enough to leave that mode and enter the normal pressure target "mode" (the ECU appears to operate in two modes, one when you're on the throttle, one when you're not), even with the revs in that same range, no chirp. And you'll also note a difference in fuel pressure target and actual fuel pressure.

Doesn't take a rocket scientist to put together.

Unfortunately I have not yet found the perfect solution to keep the ECU from going into this mode. I'm an ECUTek dealer so I need to have a chat with those "chaps" across the pond about this. There is a table in the ECU that is 2x2 and targets 4.0MPa, but it seems to do nothing for our idle issue, it's never used (tried changing it up and down).

Another thing that would be interesting to see is if our PRV is straight mechanical or some kind of electronically controlled unit -- I seem to think electronically as we have a huge range of fuel pressure operation (all the way to 20mpa, ~2900psi. Almost 2x higher than the MS3 platform). Just the way everything behaves leads me to believe it is electronic... but I haven't had the time to look yet.

[Koa]

That is @VitViper

He kinda fell off the face of the planet on this subject. Wonder how much headway he's made, and if any of his perspectives can be used to solve the noise, if it indeed is a noise that can be solved while retaining the function of the fuel pump