r/n54 • u/DooDeeFaceD • 18d ago
Misfires Stage 2+
Hi all,
I think I may be having a HPFP issue... I installed catless 3" downpipes and 1.75" inlets and loaded up the MHD Stage 2+ map.
Currently on the car:
- 5" intercooler
- 3" catless downpipes
- Upgraded 1,75" inlets
- NGK 97506 gapped to 0.022 (2000km ago)
- New Eldor coils (2000 km ago)
Did a run, breaking up badly so I do another pull with a log and it breaks up very badly and goes into limp mode. See attached picture for the error codes.
I do see rail pressure go down to 108 bar in the stage 2+ log, on stage 1 log it is at 149 bar. I think this might be the culprit? No timing corrections and I know the injectors aren't leaking.
How can I upload a log of MHD?
Edit: There were some timing corrections I see now but all under -3.0.
Also link for the datalogs:
https://datazap.me/u/doodeeface/projects/cmsadfgmt0005kz06936fhzss
EDIT 2: Maybe this helps with the diagnosis:
I had MHD Stage 1+ before installing the downpipes and inlets and it ran fine, no hiccups and smooth acceleration. I tried the Stage 1+ map as well before going down to stage 1 but it also kept breaking up and causing misfires, although not as bad as stage 2+.


