Quote:
Originally Posted by VitViper
Currently the tune can't... the tables to control this behavior are not available to us yet. I managed to "band aid" it a bit, but the band aid works pretty poorly at the moment.
But just based on the datalogging and research I've done on our car so far (700 miles on the car... there's nothing wrong with the pump, lol) the noise is a result of the way the ECU is running the DI system. So you guys can stop changing pumps and screwing with lubricants and additives... (really, if the piston in the HPFP was rubbing you wouldn't be getting a chirp... it would grind and then possibly seize and you'd skip timing when the chain broke... ask me how I know... POS VW GTI).
As for the OEM's... I don't fail to see why they would think it's a problem as they actually appear to have programmed this behavior in... maybe they didn't intend on the noise, but 4MPa is ~580psi and I can't imagine the PRV would be silent trying to vent pressure through it with a 4MPa target.
Hell the MSF guys went 5 years and people put up with the issue until I pointed out the source and the solution... lol.
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And this is why having engines full of electronics bug me at times, my solution would be a pump along the lines of the ones used in older diesels. I actually thought of the the noise being something to do with pressure relief back a while ago. And no, I'm not some stubborn older guy. I spent most of my 4 years of education dealing with all mechanical engines, they are so simple.