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View Poll Results: Do you have drone WITH the valve mod? | |||
YES, I have a DCT and have drone WITH the valve mod. | 29 | 36.71% | |
YES, I have a 6MT and have drone WITH the valve mod. | 4 | 5.06% | |
NO, I have a DCT and DO NOT have drone WITH the valve mod. | 16 | 20.25% | |
NO, I have a 6MT and DO NOT have drone WITH the valve mod. | 30 | 37.97% | |
Voters: 79. You may not vote on this poll |
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12-15-2014, 05:03 PM | #133 |
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Well, guys and gals...I went out to shoot some video for you with 3 Garmin Virbs. I came back with only 2 of the cameras. Fortunately I used one cam to locate where the 3rd cam fell off at. Unfortunately someone took it from the side of the road before I could get to it. The mount did not hold it on my rear bumper more than 100 yards from my driveway before it gave up. Pretty sad.
Last edited by Accel Junky; 12-15-2014 at 05:55 PM.. |
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12-15-2014, 05:05 PM | #134 | |
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12-15-2014, 06:34 PM | #135 | |
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12-15-2014, 10:19 PM | #136 |
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Ok, ladies and gents...I have a new video cruising, accelerating casually, and cruising with music with the exhaust valve mod. I had a rear camera on the tail pipes but it fell off and when I got back to get it some jackass stole it.
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12-16-2014, 06:50 AM | #137 | |
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12-16-2014, 07:19 AM | #138 | |
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I saw your recent video, and maybe it's my crappy speakers, but I couldn't really hear it. Sounds very quite inside the cabin, which isn't the case in my car. I think I'm plugging mine back in as it is ridiculously loud at 3:30 in the morning and the drone with DCT is too much at times. I'll convince myself plugging them back in restores any power loss
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12-16-2014, 08:29 AM | #139 | |
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under 3000 RPM the sound is completely different in any mode vs having them unplugged. not to say this mod is for everyone, but it definitely doesn't sound the same as sport mode with them plugged in. someone needs to strap the car to a dyno with them plugged in and unplugged and do a couple runs to put this to bed. I would say I would be VERY surprised if there was a power difference, it just doesn't make any sense at all. its too far downstream in the exhaust to matter, and less restriction that far downstream doesn't make any sense to me logically THE ONLY thing that could make sense is if somehow the DME has a reaction to them being unplugged and pulls timing or power. But I do not notice this, and one would think there would be a CEL associated with this.
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12-16-2014, 08:58 AM | #140 | |
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For the performance I totally agree with you, I didn't feel any power loss, I just did many runs with my VBOX plugged and unplugged and plugged in was always faster with just few tenths. I really don't have any objective explanation for that. I don't say anything bad about this mod, I have driven my car unplugged for 2 weeks and I really loved it, it's just that I would like to understand why I had 2 or 3 tenths differences when I have tested with my VBOX. The reason I remains the plugged in is because I do a lot of trips on highways and it gave me headache after 500 kms |
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12-16-2014, 09:05 AM | #141 | |
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the valves are definitely NOT open before 2500-3000 RPM in any mode with the plugs connected. you can easily tell this when driving around town with them plugged in and then unplugged. the valves are always closed at start up, regardless of mode. there is some literature on this from BMW, I just don't happen to have it handy
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12-16-2014, 09:07 AM | #142 | |
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I noticed the video volume is a bit low. iMovie was turned up all the way and I checked my Garmin Virbs and there was no audio volume setting. Maybe these things just record the audio at lower levels. It's a good thing I included some reference points (like the music at 50%). I'll have to research and see how I can fix that for future videos. Most of my other videos were taken with my iPhone. Last edited by Accel Junky; 12-16-2014 at 09:13 AM.. |
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12-16-2014, 09:09 AM | #143 | |
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whats the start/stop feature? |
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12-16-2014, 09:10 AM | #144 | |
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Yes, there is a cold start video on the first page that shows my wife's M3 with valves closed at start and mine with valves open. To my knowledge the car starts up outside of you M buttons or throttle settings. I guess that is why in the past you always had to reflash for "sport always on". |
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12-16-2014, 09:12 AM | #145 |
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Above your engine start button is a small button that you use to enable or disable start/stop. It kills the engine at stoplights and such and then recranks it when you proceed to take off. Same as a hybrid car.
If you press the button and it lights up, that disables it and the car will remember that every time you start up. I don't use that feature. The wear on the engine and starter (I'm assuming) is not worth the marginal gas savings. |
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12-16-2014, 09:17 AM | #146 | |
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... At lower gears, the exhaust valves are always open, while when higher gears are selected under constant driving conditions, they are closed; however, if the load conditions change accordingly, they open up in a flash. There are also ranges in which we have chosen to close the valves, for instance at low engine speeds in high gears |
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12-16-2014, 09:43 AM | #147 | |
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I have noticed a huge difference cold start, and in low rpm. My car sounds way better and now I have no use for a new exhaust as I would only get it for sound. I may get black tips at some point. If you feel a change in performance or try to "feel a difference" you probably will feel a difference as you will expect it. I highly doubt there is any noticeable difference with the valves being open.
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12-16-2014, 02:33 PM | #148 | |
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12-16-2014, 02:36 PM | #149 |
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I don't think you need to code it out. Just press it once to disable it (disabled when lit) and the car will remember that setting every time you get in. I'm sure if you disconnect the battery or something like that it might switch back off.
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12-16-2014, 08:20 PM | #150 |
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Mine had to be coded, it was ON every time I start the car
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12-16-2014, 08:30 PM | #151 | |
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12-16-2014, 08:42 PM | #152 | |
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Based on 3,000 miles of driving prior to pulling the plugs, I am certain that the valves are constantly tweaking based on some insane amount of research that is designed to eliminate every possible moment of drone, regardless of mode. The car is undoubtedly louder at low RPMs most of the time with the plugs pulled.
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12-19-2014, 06:28 AM | #153 |
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I plugged mine back in but quickly unplugged them again. The car sounds so much better opened up! I really don't want to spend thousands on an exhaust so this mod is the next best thing. I'm still concerned about possible power reductions but I've started doing some unscientific testing, and I haven't noticed it.
It is obvious as others have stated, that the valves are not open (at least all the way) in Sport and Sport + at low RPMs. The sound is much different with the valves unplugged.
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12-19-2014, 07:03 AM | #154 | |
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As far as downsides...I have driven my wife's M3 back to back with mine with the mod. Honestly I can't tell a difference in spooling and these things spool slow enough where I think I could feel a change. So I doubt the effect on back pressure during spooling is of any consequence. As far gas mileage...that I don't know. I would need to do some testing over many tanks of gas for my commute to figure that one out. It is probably so minimal it would be hard to detect. I will get you guys a video soon of mod vs no mod as far as what it sounds like at low rpm, low load from outside the car driving off into the sunset. Just need to get my wife to shoot it with me and her car as well. |
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