Hey guys, according to some initial research this appears to be a common issue amongst the RS community when running high boost.
From the intel that I have gathered thus far, the pump/controller overheats and can no longer maintain the pressure needed.
CTS said This fuel cut seems to be a more-or-less common occurrence with MK2 TT-RS and usually is fixed by replacing the low pressure pump or some customers have installed a TorqByte fuel pump controller. However, torqbyte required some sort of custom coding to make it work with the TT-RS. I do not have much detail on that unfortunately.
The fuel cut always seems to happen under WOT between 5-6k rpm.
The dealers suggested route is to first change the fuel filter, then inspect the HPFP to visually inspect the spring and plunger.
I've seen a few guys upgrade to either a Loba or an Autotech HPFP.
There was a vague post about "wiring", and if the above does not fix the issue then replacing the LPFP as a last resort.
I just thought someone here might have experienced the same issue or similar and could best direct me on the fix.
You could try logging with Vag-Com. Full disclosure, I've never done this & don't know how, but the info will be out there.
Have you upgraded the HPFP? AFAIK that should be done with most Stage 2 tunes. The LPFP can flow enough fuel to go past 500HP from what I've heard. That doesn't mean that you don't have a faulty one (or wiring), but I've not heard anything to suggest they fail often. On the contrary, I think they are a very robust unit. If you are in the US, you can buy a new one for $360 if needed. https://store.ngpracing.com/oem-vdo-ttrs-fuel-pump.html
If you haven't upgraded the HPFP, I'd start there. Alternatively, you could ask the tuner to back off the tune a little so it doesn't request as much fuel.
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