07-13-2023, 05:35 AM | #1 |
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BM3 Stage 1 knocks
Could someone advise whether I have a problem with the amount of knocks I get (60+ knocks within 20mins city drive)? I am on BM3 Stage 1 91Oct (using 95RON + 98RON fuel)
I read in other posts that knocks when cruising/normal driving is normal but with this amount of knocks, it's just concerning... https://www.bootmod3.net/log?id=64ae...0b43aa72e6499a https://www.bootmod3.net/log?id=64ae...90c6c2cc6adb1f |
08-18-2023, 07:07 AM | #3 | |
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Drives: 2015 BMW 335i x-Drive Auto
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05-24-2024, 03:47 PM | #5 |
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Knocking
Did anyone figure out the cause of the excessive knocking shown on the datalog? I have been feeling slippage/hesitation when accelerating with about 80% throttle pass 2k rpm. I suspect that it's bad gas (Costco 91), but could the injectors also be clogged due to the bad gas? How did you guys resolve the knockings.
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05-25-2024, 06:48 AM | #6 | |
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Quick ways to determine if you have a tank of bad fuel is to add 1-2 gallons of E85 to the tank. Each gallon in a full tank bumps the ethanol content up about 5% so E10 (gasoline) to E15 or E20. Another way is to flash a lower octane tune so 93 to 91, or 91 to 91ACN. If the engine suddenly drives much smoother and stronger it is typically a tank of weak gas |
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05-25-2024, 11:32 PM | #7 | |
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https://www.bootmod3.net/log?id=6652...c70e1310e85837 Here's a datalog I did today just on a casual drive, no WOT but still some hard acceleration, and I see some knocks too but it went down to below 0.5 which is different from the datalog I had with the "bad gas" I had before that was giving 0.5 and 1 knocks. |
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05-26-2024, 07:55 AM | #8 | |
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One day I saw a gasoline delivery truck pumping gas into the underground tanks at the station that I use. I struck up a conversation and learned where he picked up his gasoline at a refinery depot about 10 miles away and that he delivered to most of the gas stations in my local area. So if the refinery depot was the source of a bad/weak gas for one station, it could also be at others. I still suggest flashing a lower octane tune or putting 2 gallons of E85 in a tankful to see if that changes anything with the fuel before moving onto other causes. |
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05-26-2024, 02:22 PM | #9 | |
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06-02-2024, 06:26 PM | #10 |
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I've been having the same issue with my n20. No codes have popped up and I've tried a 93-octane tune, 91-octane, 91 ACN tune, and they've all had knock detection going off at random times. It was even going off on the stock tune, so I'd be interested if anyone has any ideas.
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