Quote:
Originally Posted by tracerit
Ah yeah I'm currently on the stage 2 el e85 tune and have been using it for the last 40 miles. My issue is that I'm still getting the 4k noise with it. With reports that any uel stage 2 tune will get rid of it, I want to try it out but with the stock El header still on. So my question is more will running an uel header tune be dangerous while equipped with an el header.?
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I gotcha. I actually had the same complaint and found it is likely sound from adjusted vvt tables. This engine lets off a lot of resonated sound at that rpm range once you retune it. The factory vvt map is a fair bit quieter. This is a common comment and there are many threads on it I was able to find but I don't have them available 'cause I am at work and not on my home PC. You should definitely log fbck and flkc and see if there are signs of knock just to be safe.
For me it's an ~500rpm band from 3500 to 4000 ish. Hope the information is helpful though, I embraced mine and don't have a solid fix.