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BMW M5 F90 (2018+) General Forums Engine, Exhaust, Drivetrain, Tuning Modifications    Exhaust valves

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      07-29-2019, 11:12 PM   #1
avi8tir
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Exhaust valves

Just got my car today. Haven't had a chance to really mess around with it yet so I thought I'd ask this question. What is the best setting for the exhaust to keep the valves open? exhaust button and engine on sport?
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      07-30-2019, 06:29 PM   #2
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anyone?
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      07-30-2019, 07:28 PM   #3
bradleyjs
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I’m not a 100% sure, but I just keep the default setting (button on - green LED) and I have M1 button engine set to Sport and it seems to work fine.

Per the manual: During the engine warm-up phase, the V8 high-performance engine has a somewhat rougher running behavior because of the emission controls. When the engine is cold, the exhaust gas system has a slightly metallic undertone due to the nature of the system.
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      07-31-2019, 01:19 AM   #4
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Exhaust button to on (green) and sport or sport plus will keep the valves open.
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      07-31-2019, 03:45 AM   #5
bradleyjs
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Yeah! What he said!
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      07-31-2019, 10:18 AM   #6
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thanks!
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      07-31-2019, 10:23 AM   #7
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I believe you can also un-plug the molex plug next to each exhaust while the valves are open thus leaving the valves "stuck" in the open position. Then you just tie the plugs back with a zip-tie.
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      07-31-2019, 11:29 AM   #8
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Quote:
Originally Posted by shellbmb View Post
I believe you can also un-plug the molex plug next to each exhaust while the valves are open thus leaving the valves "stuck" in the open position. Then you just tie the plugs back with a zip-tie.
this doesn't work like the old system.
this method will throw a code i believe
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      07-31-2019, 11:19 PM   #9
AMGK1LLa
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I believe sport plus is the way to go
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      08-05-2019, 11:35 AM   #10
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Quote:
Originally Posted by gtenedio View Post
this doesn't work like the old system.
this method will throw a code i believe
Not true. Mine are unplugged with them open (have been for over a month now), and no codes have been thrown.
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      10-27-2021, 10:16 PM   #11
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Quote:
Originally Posted by ambletx View Post
Not true. Mine are unplugged with them open (have been for over a month now), and no codes have been thrown.
Same here, no codes whatsoever. I just did this little "mod" a few weeks ago and I really like it, and have no desire to plug them back in. There is a slight drone when cruising at about 2k rpm but not enough to bother me. I like being able to run the car in efficient mode and still have a nice exhaust note. I always thought that the valves were OPEN when the green light was on but as we all know that's not exactly how they work. I WISH that's how the button worked, either always on or always off then I would just leave them plugged in but this is the next best thing to me. Now I just have to find a good way to cap off these connectors so that they don't get wet...
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