mrmatto
Autocross Champion
- Location
- Jacksonville, FL
- Car(s)
- 2024 GTI DSG
I've been having some intermittent inconsistent power issues in the midrange and I'm trying to pin down what's going on. FMIC has helped, but not solved. Maybe I'm just overly sensitive to temperature-related power changes. I'm going to post logs when the car feels strong and when it feels not-so-strong and see if there's something learnable here. Car is at 59k mi but I've only put on 4k of those.
'Maybe it needs coils! Maybe it needs a carbon cleaning! Maybe it's normal! Maybe the manifold’s gonna blow! Tune in to find out!’
————————————
1/2/22 PM -- Felt good
Stock tune, 3rd gear pull, felt strong, ambient temps in 70s, 93 octane with 1 gal of E85
https://datazap.me/u/mrmattolsen/test1-1222?log=0&data=1-2-3-6
1/2/22 PM -- This felt yucky
Short third gear pull (had to let off due to traffic), felt very weak, very little torque, timing seems low.
https://datazap.me/u/mrmattolsen/log-1641221311?log=0&data=2-4-5-7-8&zoom=4290-4316
Is there a problem here? Why would timing be at -7* and -6*?
As a contrast, here are a few short 3rd gear pulls a few minutes later with no timing issues even though the IATs are the same as the above section.
https://datazap.me/u/mrmattolsen/log-1641221311?log=0&data=2-4-5-7-8&zoom=4801-4971
1/3/22 AM -- Cold day so taking IAT out of the blame set
These felt pretty strong (ignore the LTFT - sensor wasn't activated for logging)
https://datazap.me/u/mrmattolsen/log-1641224579?log=0&data=2-3-4-7-8&zoom=366-390
https://datazap.me/u/mrmattolsen/log-1641224579?log=0&data=2-3-4-7-8&zoom=519-545
https://datazap.me/u/mrmattolsen/log-1641224579?log=0&data=1-2-3-4-7-8&zoom=976-1003
LMK if you think there's anything else I should log. Going to try a few different logging apps along the way too.
1/3/22 -- New "good" log with strong performance and suggested parameters
https://datazap.me/u/mrmattolsen/log-1641232378?log=0&data=1-2-3-4-5-6-7-8-9
1/4/22 -- Another "good log." This pull felt OK. Not especially strong, not weak, just OK. Timing looks normal.
https://datazap.me/u/mrmattolsen/log-1641317668?log=0&data=1-2-3-4-6-7-8-9-10&zoom=100-141
1/5/22 -- Felt pretty weak
https://datazap.me/u/mrmattolsen/log-1641405112?log=0&data=1-2-3-4-5-6-7-8-9&zoom=382-399
I don't see any timing issues...
1/5/22 -- Felt strong
https://datazap.me/u/mrmattolsen/log-1641405112?log=0&data=1-2-3-4-5-6-7-8-9&zoom=494-514
Looks similar to above, but actually had a degree less timing yet felt stronger.
1/5/22 -- Felt OK-ish
https://datazap.me/u/mrmattolsen/log-1641405112?log=0&data=1-2-3-4-5-6-7-8-9&zoom=662-681
Looks the same
Added fuel flow since that was automatically captured: https://datazap.me/u/mrmattolsen/log-1641420614?log=0&data=2-3
'Maybe it needs coils! Maybe it needs a carbon cleaning! Maybe it's normal! Maybe the manifold’s gonna blow! Tune in to find out!’
————————————
1/2/22 PM -- Felt good
Stock tune, 3rd gear pull, felt strong, ambient temps in 70s, 93 octane with 1 gal of E85
https://datazap.me/u/mrmattolsen/test1-1222?log=0&data=1-2-3-6
1/2/22 PM -- This felt yucky
Short third gear pull (had to let off due to traffic), felt very weak, very little torque, timing seems low.
https://datazap.me/u/mrmattolsen/log-1641221311?log=0&data=2-4-5-7-8&zoom=4290-4316
Is there a problem here? Why would timing be at -7* and -6*?
As a contrast, here are a few short 3rd gear pulls a few minutes later with no timing issues even though the IATs are the same as the above section.
https://datazap.me/u/mrmattolsen/log-1641221311?log=0&data=2-4-5-7-8&zoom=4801-4971
1/3/22 AM -- Cold day so taking IAT out of the blame set
These felt pretty strong (ignore the LTFT - sensor wasn't activated for logging)
https://datazap.me/u/mrmattolsen/log-1641224579?log=0&data=2-3-4-7-8&zoom=366-390
https://datazap.me/u/mrmattolsen/log-1641224579?log=0&data=2-3-4-7-8&zoom=519-545
https://datazap.me/u/mrmattolsen/log-1641224579?log=0&data=1-2-3-4-7-8&zoom=976-1003
LMK if you think there's anything else I should log. Going to try a few different logging apps along the way too.
1/3/22 -- New "good" log with strong performance and suggested parameters
https://datazap.me/u/mrmattolsen/log-1641232378?log=0&data=1-2-3-4-5-6-7-8-9
1/4/22 -- Another "good log." This pull felt OK. Not especially strong, not weak, just OK. Timing looks normal.
https://datazap.me/u/mrmattolsen/log-1641317668?log=0&data=1-2-3-4-6-7-8-9-10&zoom=100-141
1/5/22 -- Felt pretty weak
https://datazap.me/u/mrmattolsen/log-1641405112?log=0&data=1-2-3-4-5-6-7-8-9&zoom=382-399
I don't see any timing issues...
1/5/22 -- Felt strong
https://datazap.me/u/mrmattolsen/log-1641405112?log=0&data=1-2-3-4-5-6-7-8-9&zoom=494-514
Looks similar to above, but actually had a degree less timing yet felt stronger.
1/5/22 -- Felt OK-ish
https://datazap.me/u/mrmattolsen/log-1641405112?log=0&data=1-2-3-4-5-6-7-8-9&zoom=662-681
Looks the same
Added fuel flow since that was automatically captured: https://datazap.me/u/mrmattolsen/log-1641420614?log=0&data=2-3
Last edited: