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1.4T E78 - Another story about knock
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:
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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 :confused:
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!