03-06-2018, 11:57 AM | #23 |
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I asked this in the other thread but I wanted to get the question in here as well: My big question is does this have any negative effects on the car or how it warms up? BMW engineered the exhaust to have only one flap open for a reason, but that reason to me is unknown.
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03-06-2018, 12:11 PM | #24 |
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03-06-2018, 06:49 PM | #25 | |
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05-24-2018, 09:18 AM | #26 |
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More Exhaust Control
I know this sounds contrary to having an M40i, but is there anyway to code the exhaust to keep the flaps closed on startup?
For example, on startup: If in Sport, Sport +, etc, keep open. If in Comfort or Eco mode when started, close exhaust flaps. Any thoughts? |
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05-24-2018, 06:26 PM | #27 |
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Only one exhaust is open during normal startup.
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05-24-2018, 06:37 PM | #28 | |
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I believe the JB4 module, however, lets you turn on and off with your blinker or some such trickery. |
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06-05-2018, 02:54 AM | #29 | |
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Hey DBU
I just did this on my 2018 x4 m40i. I think the flap is now permanently closed. I took it out drove it for a while and when I got back the left side exhaust is cold still, the right exhaust is really hot. I was able to reach down and press on the valve to manually open it. It was cold too... Yours is working just fine? The flap will open right when you start the engine? There wasn't any vacuum from either hose when i start the car.. bypassing the solenoid is supposed to have the vacuum on the valve all the time and thus the flap would be always open, right?.. cant figure out whats going on, supposed to be a very easy mod Quote:
Last edited by lililii; 06-05-2018 at 04:53 AM.. Reason: adding detail |
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06-05-2018, 10:25 PM | #30 | |
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If you disconnect the vacuum tubes, start the car and neither tube is sucking air, well, that would point to a failed vacuum system OR there is something else at work here that we don't (yet) understand. I have always assumed that vacuum was supplied whenever the motor was running, but it is conceivable that the BMW engineers have concocted a combination of vacuum AND electrical signal. Wouldn't be the first time BMW has over engineered something simple... PS: My wife claims she sometimes can hear a hissing sound in the car. My old ears don't hear it, but I have heard it close to the exhaust flap (when it wasn't working). Wife confirmed the sound to be "very similar..." Go figure..
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07-11-2018, 05:25 PM | #31 |
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This is not helpful to those looking for more sound in comfort or eco mode...but for startup noise, I discovered that if I just sit in the car, hit sport, then start it up, it is definitely louder. You guys are way above my head on this solenoid and vacuum talk. I have no clue. I have recently noticed though, that when switching from comfort to sport in some instances the exhaust valve does not adjust (meaning I cannot make it pop and burble like I normally can by speeding up in first, then backing off etc. May have to get the dealer to check that too.
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07-11-2018, 06:14 PM | #32 | |
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When it is warmed up, it makes all kinds of noise going down any road. Oh wait....you haven't boosted your's yet so your's is just being silly. Give that thing a little boost and see what you have been missing.... Seriously though, mine sounds like cannons going off when I am in Map 5 and on 96+ octane. It's close to the sound of my AMG which is a 605 hp V8. |
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07-12-2018, 01:26 AM | #33 | |
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Can't wait. Almost went JB4, decided to hold off to see what Dinan offers and hoping they will have a full upgrade at some point, not just a stage 1. But I've been following you guys and the numbers...you guys are running legit low 12 second quarters and 4.1 or so 0-60? I'd love to hit flat 4 seconds on 0-60 or even 3.9 to match the M3. |
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07-12-2018, 01:28 AM | #34 | |
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07-12-2018, 08:48 AM | #35 | ||||
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07-12-2018, 10:21 AM | #36 | |||||
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18 X3 M40i/ Dark Graphite/ Cognac/ MP ECU Stage 2.5
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07-12-2018, 01:52 PM | #37 |
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07-12-2018, 01:53 PM | #38 |
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07-12-2018, 03:58 PM | #40 |
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07-12-2018, 04:13 PM | #41 |
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07-12-2018, 04:20 PM | #42 | |
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One thing I am uncertain about is the 1ft rollout on a Dragy. Is it calculated in there or not? If not, we are probably 0.2-0.3 seconds quicker than what is showing. |
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07-12-2018, 05:28 PM | #43 |
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07-13-2018, 02:11 PM | #44 |
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Today is the first day I have seen another M40 around town and it was in my neighbors driveway. He is a diehard Benz guy so I think it was a visitor. You won't believe this but it had a UT sticker on it. Did you come over after all?
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