All Things Mk5 > Performance Modifications

Fuel pressure deficiency...

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pudding:
Blimey, where does the time go!

Glad you got it sorted in the end  :happy2:

Apparently there are 4 separate maps just for the LPFP, so it's understandable mistakes can be made in that area.

ROH ECHT:
Thanks...I see where you asked about the LPFP control module. I actually had the Torqbyte PM3, and it was paired with the TTRS pump, but the problem persisted when I deleted all that and went back to just the OEM module and OEM pump. Two years ago, following the rebuild, is when I swapped the injectors and returned to the OE control module and pump, new HPFP and upgrade, and tried an aftermarket LPFP upgrade (which failed to operate) in the original basket. Nothing helped. So I had reached the point of nothing left to try. I was literally stumped...and it then took some digging through GIACs records for them to find and then retrieve the exact file name that their dealer selected to be loaded back in 2016. And then more time finding the one loaded way back in 2010 or 2011. This original file we sought was a to be the file I had prior to trying the DM tune in 2014. When we found and got that one loaded, all was good again.

pudding:
Blimey, what a journey that was.  We don't generally mess with the LPFP side in Europe unless running hybrid/big turbo conversions, hence why I was curious about why you needed a bigger pump and controller for a K04 conversion. The stock LPFP setup easily supports 370 crank power on K04 cars over here  :smiley:  The tunes here don't tend to go richer than 12:1 though, maybe 11.5-11 AFR approaching the redline.

ROH ECHT:
I looked at some old logs just now. Fuel ratio for then, throughout a full rev run, was generally 12.1 to 11.6 nearer to redline.

The addition of the upgraded pump and controller was per the tuner. The DM tune was an 'E-tune' if you will. He sent the loader and emailed a base file for me to load onto the ECU. I would do so and log data to send back via email. He would make any adjustments if he felt it necessary and return to me a revision if and when done, until it was finalized (about six months). He had it boosting to near 28 psi peak and holding a 25 psi minimum. My delivery fueling was found during the process to be suffering, and thus the upgrades were added. The rail pressure was set at 142.5 bar.

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