10-31-2020, 03:25 AM | #1 |
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Cold start not loud this morning
For its first time my m5 was parket outside my garage over night.
This morning when i startet, it was not loud on Cold start, almost like somone had driven it. Coodstart worked, but it was just not loud Any idea whats going on ? |
11-01-2020, 04:29 AM | #2 |
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No problem this morning, made it's morning roar, and nabours looked pissed, so everything is in harmony again 😁
I think I was a physocoacoustic ting that made the car seem less loud yesterday, normally it's parked in my garage and that exacerbate the sound a lot, and parked in the free on a hill, just make it sound less loud |
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11-03-2020, 02:07 PM | #3 |
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Is there a reason to delete the cold start routine? I know folks did the same for the E60 M5s but not sure why.
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11-06-2020, 08:44 AM | #4 | |
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Cold start is not a feature to "warm up the engine" like some people think. It's there for the catalytic converters. So those who do catless downpipes technically don't need this feature. Some of these people don't like the loud start or bothering their neighbors early in the morning, especially with the louder catless exhaust, so they code it out. We don't realize how loud cold start really is when sitting in the car. Trust me, your neighbors can hear it. Then there's jerkies like me who like to start the car with authority. Lol. I like the cold start.
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11-06-2020, 08:56 AM | #5 |
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I love cold start.
So I opened my valves all the time.
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11-10-2020, 07:45 AM | #6 |
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Is there any detrimental effect to the cats or emission system by doing this? How do you keep it open all the time - coding or did you mechanically change something?
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11-10-2020, 08:59 PM | #7 | |
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It does not affect cats or emission, there is a valve between exhaust tips that open due to pressure. Just get a zip tie(thick one), grab a hinge between the tip and you will see looking at the tips a valve that opens and closes. I just sat behind the tips and grabbed it and zip tied it. Love the bubbles when you press the gas even slightly.
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11-11-2020, 12:11 PM | #8 | |
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11-11-2020, 01:54 PM | #9 |
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Coded mine out as I hated the loud cold start, much happier now.
Only there to heat the catalytic converters faster to quicker get within emissions spec. Why would you need to force the exhaust valves open? I just put it in sport or sport+ and that opens the valves. I like the option to be in "quiet mode" when in efficient.
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11-11-2020, 07:14 PM | #10 | |
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11-12-2020, 04:40 AM | #11 | |
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Maybe a Euro/US difference? mine is a Euro -14 Competition Pack with the latest available software.
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11-12-2020, 05:43 AM | #12 | |
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If I want the car to be quiet as I do on one particular street then I press and it goes into quiet mode..just like on Kitt |
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01-24-2022, 01:34 PM | #13 |
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I’ve read elsewhere that the cold start delete interferes with the O2 and Evap sensor monitoring… does anyone know if that’s actually true?
Emissions testing would likely fail in states that require these monitors to be ‘ready.’ |
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