Running Rich - Seeking Advice

[AudiB5owner]

Car: 2001 1.8T AWM w/ K03
Tune: APR Stage 1 91 Octane

Symptoms

• STFT: -26.5
• LTFT: -8
• AFR is around 11-12when starting car before ECU adjusts fuel trims
• Boost spikes at 20 PSI in second gear and above, tapers down to 14 PSI by redline
• Poor fuel economy
• Backfires when revving
• Feels like losing power in higher RPMs when boost tapers off

Tests

• Coolant temperature normal
• Passed boost leak via Turbo Inlet @ 5 PSI
• O2 sensor is new
• FPR is new
• Compression normal
• No codes

Does anyone have advice as to where I should check next? I'm stumped lol. Thank you for your time!

[RENOxDECEPTION]

it's an 01 so monitor block 031 and see if you're actually running rich or if the ECU is able to compensate for it.

You throw a code? with a LTFT of -8 I doubt it, codes are thrown over 10% corrections, unless I'm mistaken.