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Title: Audi A5 CDN K04h power fluctuations Post by: l3v1athan on November 18, 2024, 05:31:41 AM Hi all,
Coming here after almost 2 years of frustrations with a power cut issue under full throttle. Have a A5 2.0T CDN 8K5907115 with a hybrid k04 turbo, but 3rd gear and up I'm getting throttle closing at around 5k rpm. Issue started on a previous tune when I moved cities from a high altitude (1400m) to the coast. Never had issues at altitude and was making around 280kw (reported on VCDS) Decided to take the tuning into my own hands, bought all the hardware etc, but the car is still replicating the same issues. I've logged pretty much all the usual suspects: rl, rlmax, rlmx, ldrlts, rlsol, ps, psol, frxt, mifa, misol etc. rlsol seems to be the main culprit that starts dipping and causes the rest of the variables to follow the same by cutting boost, dropping load etc. There is slight knock intervention, but only in 3rd gear and between ~3000-4000rpm but 4th,5th doesn't have any of that. Increased fuel pressure to 17bar and running it richer to compensate for our 95 RON fuel and nothing changed as it sometimes also stuttered as if it's a fuelling issue. KFMIRL and KFMIOP are the inverse of each other as well, so it's not that. Is there anything else I should be looking at that will affect rlsol? Pulling back the torque definitely will get rid of the issue and at like 80% throttle the issue doesn't exist either. Things to note that may have an influence: Stock filter Aluminium boost pipes R8 coilpack Running colder spark (BKR8EIX) DV vent to atmosphere Decat with lambda fooler Running Stage 2 TCU tune Title: Re: Audi A5 CDN K04h power fluctuations Post by: fknbrkn on November 18, 2024, 05:44:40 AM Post logs
First of all check misol for torque intervention, especially migs_w Title: Re: Audi A5 CDN K04h power fluctuations Post by: l3v1athan on November 18, 2024, 12:48:34 PM Logs from the weekend attached. Seems I forgot to log migs_w will log again and share results.
Only noticed now with the scales the same that both pssol and rlsol drop at the same time, previously looked like rlsol was dipping first but I was wrong. Title: Re: Audi A5 CDN K04h power fluctuations Post by: prj on November 18, 2024, 04:37:34 PM Start by posting logs instead of screenshots.
Title: Re: Audi A5 CDN K04h power fluctuations Post by: l3v1athan on November 19, 2024, 12:36:57 PM Start by posting logs instead of screenshots. Logs attached. Logged milsol for the first time and noticed now it seems to be the first thing to start dropping. Gonna have to deep dive the ETSPth in the FR for this one. |