08-10-2023, 06:12 PM | #1 |
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Tying off exhaust valve flaps....also, do they ever open 100%?
So I just got rid of my AMG GT53 because it's slow and I hated it and needed to get back in a M. I have a M8 GC Comp. coming in a couple weeks.
I had an exhaust valve controller on my AMG (it had the performance exhaust option) that I actually had to wire to each plug on both sides of the exhaust. You can't just tie those off as it throws a CEL on AMG's. When I had my F90, I was able to just tie them off once they were open. Now, on the AMG, apparently the flaps were never 100% open unless at full throttle. The performance exhaust option only opens them like 50% I've heard. Hence, the controller module I had was able to open them 100% of the time. Is it the same on the M's? Does the exhaust flap not ever open all the way except at full throttle? If so, I might be inclined to get a controller instead of tying them off.
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2022 M8 Comp GC, 2021 AMG GT53, 2022 X5M Competition, 2021 X7 40i, 2019 M5, 2018 M550I, 2017 Audi Q7, 2014 M6 GC, 2013 Mercedes CLS550, 2011 750LI, 2008 M6 Cabrio, 2008 Porsche Cayenne S, 2004 Mercedes SL55 AMG, 2003 Mercedes SL500, 2000 Mercedes CL500, 1993 Lexus SC400, 1989 525i, 1985 318i
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08-10-2023, 09:57 PM | #2 | |
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08-10-2023, 11:49 PM | #3 |
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Thanks, bud!
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2022 M8 Comp GC, 2021 AMG GT53, 2022 X5M Competition, 2021 X7 40i, 2019 M5, 2018 M550I, 2017 Audi Q7, 2014 M6 GC, 2013 Mercedes CLS550, 2011 750LI, 2008 M6 Cabrio, 2008 Porsche Cayenne S, 2004 Mercedes SL55 AMG, 2003 Mercedes SL500, 2000 Mercedes CL500, 1993 Lexus SC400, 1989 525i, 1985 318i
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08-12-2023, 07:11 PM | #4 |
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08-14-2023, 03:24 PM | #6 |
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I was told that the flaps ONLY open 100% in sport mode during a cold start but after the idle settles, they close a bit. If this's the case, is it best to remove the fuses during a cold start (before the idle settles) to keep them open 100%? Can anyone clarify?
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08-14-2023, 04:16 PM | #7 |
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Yeah, I have heard similar things......curious as to what the truth is.
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2022 M8 Comp GC, 2021 AMG GT53, 2022 X5M Competition, 2021 X7 40i, 2019 M5, 2018 M550I, 2017 Audi Q7, 2014 M6 GC, 2013 Mercedes CLS550, 2011 750LI, 2008 M6 Cabrio, 2008 Porsche Cayenne S, 2004 Mercedes SL55 AMG, 2003 Mercedes SL500, 2000 Mercedes CL500, 1993 Lexus SC400, 1989 525i, 1985 318i
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08-14-2023, 10:37 PM | #8 |
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On my m850i at least, they’re closed on cold start and then fully open once idle settles. That’s when you pull the fuse. You can watch the valve after you start the car and see it visually open/close.
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08-15-2023, 12:05 AM | #9 | |
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I used to experience the other way. OK, I do not have a 8 physically in my hands at this moment, but will be. May be market location regulations matter? I am in southern US. |
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08-15-2023, 07:06 AM | #10 |
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08-15-2023, 08:45 AM | #11 |
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08-15-2023, 08:47 AM | #12 |
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They’re muffling the cold start so you don’t scare little kids and small dogs.
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08-15-2023, 12:33 PM | #13 | |
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Thanks for informing. So many subtle differences each car has. Very interesting, like reading different books. |
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02-22-2024, 01:43 PM | #14 |
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So you guys are pulling these fuses while the loud cold start is happening for the 1st 30 seconds of starting the car in sport plus? I never pulled a fuse while car was running
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02-22-2024, 02:30 PM | #15 |
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I used the bimmerlink app to open the flaps then pulled the fuse. No issues or errors from doing it while the car was running.
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02-22-2024, 04:40 PM | #16 |
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Wait until the idle calms down and put it in sport plus. You’ll hear the flaps open (check visually) then pull the fuse. It’s only 7.5a so not much current running through it.
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02-22-2024, 06:11 PM | #17 |
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02-22-2024, 06:31 PM | #18 |
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Is there a difference in ing the fuse permanently vs just starting in sport individual before turning the vehicle on? I do like the louder exhaust so typically hitting the sport button and then hitting the button does it for me - is it louder otherwise with the fuses pulled?
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02-23-2024, 05:03 AM | #19 | |
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02-23-2024, 07:15 AM | #20 | |
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02-23-2024, 09:43 AM | #21 |
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Got it! So effectively its the same thing as starting in sport mode but allows same exhaust note regardless of setting - thx
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02-23-2024, 02:10 PM | #22 |
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I got out car and noticed flaps were open, so pulled the fuses based on this online diagram. Looking forward to next cold start. I only saw flaps on the outer pipes
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