Thread: Knock detected
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      01-09-2022, 05:57 PM   #7
johnung
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Drives: 2015 BMW 335i x-Drive Auto
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Quote:
Originally Posted by snipagang View Post
Quote:
Originally Posted by sqwinny View Post
That won't change anything. Everything looks normal. The only thing I can see from the parameters you show MIGHT (this may be a stretch) is octane. Your 91 might be winter or crappy. Reason I say that is it's winter gas and its very inconsistent for octane + ethanol content.

No crazy fuel issues, no HPFP issues, no LPFP issues, a VERY MINOR small timing correction but that's normal in logs. Very rare to get a perfect log every time.

Throw in an octane booster that will treat 1/2 a tank, drink around a couple miles to mix, relog.
Whats the diff between a 91 and 93 oct tune? I use 93 shell v pwr, but is it safer to just use 91? Will car be slower? NJ.
There isn't a huge difference between 91 and 93 octane tunes. If the 93 octane gas is weak then there will be excess timing adjustments that will reduce performance. But a 91 octane tune using weak 93 octane with run smoother and feel more powerful.
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