Hi,
I'm tuning a 2017 Opel Corsa E running a 1.4T LUV/LUJ engine and E78 ECM.
The car is 100% stock except a flex fuel sensor and a wideband.
I can't get rid of the knock retard I'm seeing everytime at WOT (and less but also at part throttle for no reason), no matter how much timing I pull or how much fuel I add though power enrichment.
Please note that I'm running 100% E85 (at the moment, ethanol concentration varies from 60% to 64%) so my guess was that I wouldn't have as much knock problems as other people running gas but I was wrong it seems...
What's the next actions I can take to solve my knock issue?
Could it be related to a mechanical problem of some sort? The car seems to run great otherwise, no faults or other obvious problems.
I thought about switching to colder spark plugs (BKR7EIX) but I'm not sure if it can be of any help. Plus, I'm running E85 and from what I read it could cause issue with cold starts and all.
I attached the tune I'm currently running and some logs at the end of the post. If you prefer, I took screenshots of the areas with the worst knock:
2023-01-31 11_18_05-Window.png
2023-01-31 11_18_30-Window.png
2023-01-31 11_18_50-Window.png
2023-01-31 11_19_11-Window.png
2023-01-31 11_20_28-Window.png
2023-01-31 11_20_51-Window.png
You will notice that sometimes I'm seeing 5-6? of KR and sometimes it's close to 0 e so it's not consistent
Also, you'll see that I tried to retard my timing a lot in the areas I was seeing knock but not with great success
It's running MAF open loop since I'm still in the process of tuning it. MAF is dialed in and SD is next, but I would prefer to get rid of this KR issue before.
Thanks for the help!