03-28-2020, 03:24 PM | #1 |
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Ok so I figured I'd start a new thread here vice continuing the discussion in the thread I started about lowering springs.
So I just did the mod on my M850i to leave the exhaust valves in the open position and man on cold start does it sound so much better. Didn't get a chance to take it for a drive yet but I'm already happy that I did it. Best part was also that it took me about all of 15 minutes to do so. |
03-28-2020, 06:00 PM | #2 | |
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03-28-2020, 06:29 PM | #3 | ||
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Once that's loosened you have access to the solenoid and harness that controls the valves in the exhaust. Just unplug the harness from the solenoid which is held in by a tiny little clip. Tape up the harness connector to protect it from the elements and tuck them away nicely on the side. Reinstall the bolts you removed holding the plastic guard. Repeat this for the other side. Get in car start her up and give her a few revs and listen to how good it sounds. |
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03-30-2020, 11:09 PM | #4 | |
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03-30-2020, 11:39 PM | #5 | ||
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Sorry for the crappy writing on the pic. Lol. This is the drivers side of the car but the passenger side is exactly the same just opposite. Let me know if this helps or you need better pics. Only tool needed is a 8mm socket wrench. Honestly there really is no way to mess this up unless you don't grab the harness by the small clip and end up ripping it out. The small clip comes off real easy though so shouldn't take much to get it off. |
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04-01-2020, 08:59 PM | #7 | |
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I did this same thing for my old M3 from the first day I got the car and it never triggered a CEL for the 4 years I owned it. |
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04-01-2020, 09:07 PM | #8 | |
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04-01-2020, 09:32 PM | #9 | ||
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Just make sure you don't do it if the tailpipes are hot as it's possible you may brush up against them, depending on how big your hands are, when unplugging the harness. *disclaimer* I'm not responsible to car or bodily damage. Lol. |
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04-01-2020, 09:57 PM | #10 | |||
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1. Step inside car 2. Start it 3. Then the mechanical piece... I know, I know--I'm a first-class dick... so my wife says anyway. The only tool involved here is me. Last edited by limeypride; 04-01-2020 at 10:03 PM.. |
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04-02-2020, 01:23 AM | #12 |
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Honestly I don't know if there is a difference while driving. I didn't drive the car home from the dealership before I opened the valves and since this is my wife's car I've barely driven it at all period. Lol.
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04-02-2020, 01:26 AM | #13 | ||||
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04-02-2020, 01:48 AM | #14 | |
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On the coding aspect: hmmm, it's possible. As a software engineer, I'm leaning towards unlikely, though, since you'd either 1) need to remap some other key or 2) change its inherent default value to 'always open'. The latter is wayyy more likely than the former... again, just opinion--I didn't write any of this stuff. If it can be solved through coding (and that term is a *massive* overstatement of what coding actually is and what it's capable of affecting), it's more likely through something unconstrained like E-Sys than Bimmercode but, even then, it's a matter of discovery vs. complexity--a true needle in a planet-sized haystack of key-value pairs. Short story: I wouldn't hold you breath but it's not dead from the outset either (it's probably starting to smell a bit, though ). |
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04-02-2020, 09:20 AM | #15 |
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he's being a tool. that exhaust button is very specific to m8 only. The m850i doesn't have it or anything like it. it's not possible, it's hardware like the m buttons on the steering wheel.
it can only be done in the m8. |
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04-02-2020, 09:32 AM | #16 | |
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And that's a self-proclaimed tool if you please—per my post. |
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04-02-2020, 01:03 PM | #17 |
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I just tried this and all I can say is Wow! The car sounds deeper and louder when starting. Give it a couple of revs
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04-02-2020, 04:28 PM | #18 |
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04-04-2020, 08:36 PM | #19 |
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LOL #1 of the thread as just catching up.
LOL #2 of the thread as I got it instantaneously as no such option on our lowly M850i's hence the entire subject of the thread. |
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04-04-2020, 08:57 PM | #20 |
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04-04-2020, 10:03 PM | #21 | |
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My favorite unsuspected aspect of it is for 12 minutes after you shut to car off (similar timing for the console USB jack and 12-volt plug) it glows an "8". Ironically I was just out in the car doing some testing of my Valentine 1 Gen2 against the Gesture Controls LIDAR camera to respond by to a guy whom is seeing different results with his and a 540i with Gesture Controls. Hence, I knew it would be lit up and took the pick through the windshield. Guess I love a bit of chintzy too. Last edited by bloozemanAZ; 04-05-2020 at 05:45 PM.. |
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04-04-2020, 10:31 PM | #22 | |
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