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Old 10-15-2013, 11:42 AM   #1
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Drives: 2015 GTI
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55% WG duty cycle yielding 25+ psi boost spikes..?

Hey guys.. I've got an FSI GTI, not an R.. But my issue still may be something you could help me out with (hopefully lol)

Just got a K04 kit installed (CTS Turbo) and some vag com logs revealed something odd.. With the tune, my boost would shoot up and shoot back down, causing severe power surges until the revs climbed close to redline. My wastegate duty cycle was like a massive zig zag. To combat this until I find potential hardware issues, my tuner made me a custom file limiting the n75 to 60% load.. Well now I'm spiking up to 2800mbar, and only holding about 14 psi by the time I reach redline. Thing is, my requested vs actual is on par for te whole pull.

Can anybody shed any light on what my issue might be...? Seems like it's a unique one. Thanks in advance!



2015 GTI 3dr 6MT | GIAC Stage 2 | H&R Sport Springs | ST 25mm RSB | Spulen SSK | BFI LTD Edition shift knob | TTRS BBK.. in my garage | BFG Rival 225/40/18
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Old 10-15-2013, 07:45 PM   #2
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Check the lines going from your turbo to n75 to wastegate actuator for cracks/cuts.
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Old 11-14-2013, 08:31 PM   #3
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Did you get it figured out? My guess is one of the ports on the N75 valve is broken off. You mention request vs actual looks ok, does the file request 2800 mbar or does it just match up after the spike?
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Old 11-15-2013, 03:45 PM   #4
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Check to ensure WG preload is set correctly.
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