01-22-2019, 02:58 PM | #67 | |
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I was looking into the fuse solution and it looks like this is another method used on other BMW chassis (primarily F series - if you google search) and seems to be safe. Have you tried this yet? |
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01-23-2019, 07:59 PM | #68 |
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Had a chance to pull fuse 203 today with positive results. Steps: start and warm up, drive for 10-15min in sport mode, stop and turn off, pull fuse 203 or disconnect the valve connector to get a permanent open valve.
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01-23-2019, 08:52 PM | #69 |
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Wouldn't the valve be closed when you turn off the car?
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01-23-2019, 09:03 PM | #70 |
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01-24-2019, 01:39 AM | #71 | |
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In the meantime I started the car drove for 5 mins confirmed the driver side was open and not closed and with the car on pulled the plug. It threw a code on my JB4 saying exhaust flapper disabled so I assume the fuse method would be the same. I put a single layer of electrical tape over it and push it back on snug enough not to fall out till I pull the fuse once i find it. Starts up with both sides open so far so good. Haven’t Driven with it yet. Thanks everyone very helpful info! |
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01-24-2019, 06:56 AM | #72 | |
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01-24-2019, 07:22 AM | #73 | |
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Not necessarily, the 'default' position of the flap is open. The documents say that if the PWM signal is lost from the ECU, the flap will default open (to avoid damage to the engine under load). So it would have to be commanded shut again, which probably only happens when the engine cools down or the car restarts in Comfort. |
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01-24-2019, 08:36 AM | #74 | |
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Pulling a fuse is electrically the same as the fuse 'popping' which is exactly what they are designed to do and the car system is designed to deal with that. Just be aware there will be other high-current loads on that fuse panel, so take care and use the fuse-puller. |
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01-24-2019, 11:55 AM | #75 |
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So I think the default position is open until power is applied to the circuit. I peaked inside my exhaust pipe with a light and could visually see the flap open. I then unplugged the connector and plugged in part# 18302411427 and started the car, the valve stayed open (obviously). The plug cover has a resistor inside of it and I assume it "tricks" the computer to thinking the flap is operational.
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01-24-2019, 12:22 PM | #76 |
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Can`t wait to hear to see if it`s as simple as pulling fuse 203 and that there are no adverse effects.
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01-24-2019, 12:25 PM | #77 | |
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Did you get chance to get a close up photo of the resistor? I'd be interested to see the value and the pins (then I can get one for £0.10 from RS components!). |
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01-24-2019, 12:51 PM | #78 | |||
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01-24-2019, 02:28 PM | #79 | |
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01-24-2019, 02:41 PM | #80 |
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01-25-2019, 02:14 AM | #81 |
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Pulled fuses F203 (Open Flap) and F218 (Disable ASD) this morning. No adverse effects.
Love the sound now. No head-pounding ASD drone in Sport mode, just pure sexy engine noise. It's really how the car should have been configured from stock, you get lovely raw noise at low speed acceleration and a nearly silent cabin at cruise speed. The fuse panel is under the right rear trunk side panel. The panel lifts out and up easily with the handle, then underneath there is a pad of sound dampening material. There are two circular clips on the rear edge of this, use a flat bladed screwdriver to pop the middle pin out of each clip, then the clips remove easily without any damage. The material is also attached at the top but I couldn't see any way of easily removing this, so just fold the material diagonally up out the way towards the front of the cabin. Note that the F218 (ASD) mod only works with the Harmon Kardon top hifi. |
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02-05-2019, 01:46 PM | #83 | |
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02-07-2019, 11:30 PM | #84 |
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Anyone else here pull the fuse recently? Does it still stand that the car needs to be driven around in sport mode for 10-15 minutes and then pull the fuse? Or can I just go out to the garage and pull it one morning and it will have defaulted to open?
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02-08-2019, 03:27 AM | #85 |
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Look in your tailpipe to see if it is open or closed.
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02-08-2019, 03:45 AM | #86 | |
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In any case it is easy to check, just pull the fuse and start the car, it's pretty easy to see/feel if exhaust gas is coming out of the left pipe. |
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02-08-2019, 03:46 AM | #87 |
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02-08-2019, 04:00 AM | #88 |
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I think this connector is reverse numbered, meaning the resistor is actually between pins 1 and 3. This would make sense as pin 4 is n/c.
That means it's between switched 12v and the PWM signal wire from the DME. That PWM is wired straight back to the engine compartment, so the only other place you could jumper it would be at the DME connector, which is not going to be easy. Seems under the car is best if you want to do this. |
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