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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 37.18%
YES, I have a 6MT and have drone WITH the valve mod. 3 3.85%
NO, I have a DCT and DO NOT have drone WITH the valve mod. 16 20.51%
NO, I have a 6MT and DO NOT have drone WITH the valve mod. 30 38.46%
Voters: 78. You may not vote on this poll

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      12-07-2014, 10:16 PM   #89
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Quote:
Originally Posted by gthal View Post
Funny guy...

The quality of the sound is comparable to the C7 Stingray IMO (I wouldn't be so bold to say it is as good as the C63). Deep, rumbly, with a bit of a high pitch scream. Not quite as nice but close. It surprised me how much more bass the car has with the exhaust mod compared to OEM.

Lawnmower references are just silliness (I do, however, agree that with the valves closed it does not have a good tone or sound... this eliminates that completely).
Funny you mention the Stingray. I've been trying to explain the morning cold start sound to friends and that's been what I've describing it as. Sounds very unlike a 3 liter six.
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      12-07-2014, 10:36 PM   #90
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Quote:
Originally Posted by Accel Junky View Post
Funny you mention the Stingray. I've been trying to explain the morning cold start sound to friends and that's been what I've describing it as. Sounds very unlike a 3 liter six.
Your car sounded good pulling away. I need to hear my car from the outside. I have no idea how it sounds. It sounds good inside though.
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      12-07-2014, 11:28 PM   #91
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Mod done. Thunder tomorrow.
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      12-08-2014, 04:54 AM   #92
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Hi guys, I have driven the car more than a week with this mod.
The sound is really good at low RPM, cold start and down shift.
But, I went to a country side road where I go everytime when I wanna have fun, and I felt the car a bit different. I felt some turbo lag and the turbo's whistling was louder.
Then, I plugged my VBOX and I did some 0-100km/h runs: 4,6 sec ~ 4,7 sec without LC. 4,4 with LC.
Then I stopped somewhere and plugged back the connectors. I did another set of runs, same road of course and the result is clear: 4,4 without LC and 4,1 with LC.

Does anyone know if its normal?
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      12-08-2014, 10:58 AM   #93
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Quote:
Originally Posted by nasdaq100 View Post
Hi guys, I have driven the car more than a week with this mod.
The sound is really good at low RPM, cold start and down shift.
But, I went to a country side road where I go everytime when I wanna have fun, and I felt the car a bit different. I felt some turbo lag and the turbo's whistling was louder.
Then, I plugged my VBOX and I did some 0-100km/h runs: 4,6 sec ~ 4,7 sec without LC. 4,4 with LC.
Then I stopped somewhere and plugged back the connectors. I did another set of runs, same road of course and the result is clear: 4,4 without LC and 4,1 with LC.

Does anyone know if its normal?
It would take a good bit more testing in controlled conditions to establish whether or not it's normal, but it stands to reason. Turbo cars do spool faster with a little back pressure/flow resistance in the exhaust. If BMW engineered the valves to provide that for spool up then we may all have to plug these back in or accept sound over performance.
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      12-08-2014, 11:14 AM   #94
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This mod id awesome. Did it about 5 days ago and have enjoyed every bit of it. Goinmg through the Lincoln tunnel, it sounded ridiculous and backfired like crazy when letting off the throttle. Ill be getting downpipes this week, very excited to see how the exhuast mod sounds without cats
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      12-08-2014, 11:18 AM   #95
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Quote:
Originally Posted by chiplee View Post
It would take a good bit more testing in controlled conditions to establish whether or not it's normal, but it stands to reason. Turbo cars do spool faster with a little back pressure/flow resistance in the exhaust. If BMW engineered the valves to provide that for spool up then we may all have to plug these back in or accept sound over performance.
It makes sense.
For instance today I felt more power in high gear at low RPM than last week when I had the connectors unplugged.
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      12-08-2014, 11:54 AM   #96
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Quote:
Originally Posted by chiplee View Post
It would take a good bit more testing in controlled conditions to establish whether or not it's normal, but it stands to reason. Turbo cars do spool faster with a little back pressure/flow resistance in the exhaust. If BMW engineered the valves to provide that for spool up then we may all have to plug these back in or accept sound over performance.
Which also speaks to after market exhausts that are not valved... if this is, in fact, what is happening then it looks like non-valved exhausts like the one from ARK won't be as effective for the F8X.

Having said that, I haven't noticed any change in performance or lag with my car since I disconnected the valves. I'll have to pay attention to this to see if I can feel any sort of difference.
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      12-08-2014, 12:22 PM   #97
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It would be nice if someone could data log boost over time and then do some roll ons from 2k, 3k, 4k rpm. It was my understanding that when you went 100% throttle the exhaust valves open up instantly anyways?
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      12-08-2014, 02:40 PM   #98
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Love the MOD can't wait to hear it with my down pipes !!!!
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      12-08-2014, 11:55 PM   #99
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Spent the day with the mod. Can't wait to code out the active sound. Wanna keep it real!
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      12-09-2014, 01:04 AM   #100
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You made pulling those plugs out way to easy I can't get mine to come out maybe I'm just a moron ha!
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      12-09-2014, 07:49 AM   #101
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Any error in dashboard ?
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      12-09-2014, 11:34 AM   #102
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Quote:
Originally Posted by YianniM3 View Post
You made pulling those plugs out way to easy I can't get mine to come out maybe I'm just a moron ha!
Welcome to the club...LOL same story can't get to unplug those damn connectors:
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      12-09-2014, 11:55 AM   #103
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Quote:
Originally Posted by motex View Post
Welcome to the club...LOL same story can't get to unplug those damn connectors:
Have y'all tried pushing down the tab at the top of the connector closest to the wiring and then pulling a bit from the wiring (I know that is usually not advised but I found it to help a little as long as you are careful).
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      12-09-2014, 05:43 PM   #104
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I have a car shop close to my house, will take it there and ask them to do it for me lifting the car, my hands are too dumb for this type of job....
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      12-09-2014, 06:26 PM   #105
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Quote:
Originally Posted by motex
I have a car shop close to my house, will take it there and ask them to do it for me lifting the car, my hands are too dumb for this type of job....
Idk where your located but it probably doesn't help that it's 20 degrees out while I'm trying to do it even in my garage.
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      12-09-2014, 06:35 PM   #106
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Quote:
Originally Posted by motex View Post
I have a car shop close to my house, will take it there and ask them to do it for me lifting the car, my hands are too dumb for this type of job....
Seriously
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      12-10-2014, 03:55 PM   #107
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Quote:
Originally Posted by BlackJetE90
Quote:
Originally Posted by motex View Post
I have a car shop close to my house, will take it there and ask them to do it for me lifting the car, my hands are too dumb for this type of job....
Seriously
: yep
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      12-11-2014, 02:14 AM   #108
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Finally got them off just had to position myself better... sounds so much louder on cold start can't wait to drive it tomorrow
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      12-11-2014, 05:35 AM   #109
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I unplugged again... this mod is a head turner!!
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      12-11-2014, 06:58 AM   #110
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Did the Mod a week ago- sounds better to my ears. much louder on cold start but much better in my opinion. Cant really see a problem in the drone- only 60-70 anyway and not bad.

Cant see any difference in performance at high revs, at low revs does it matter? The question is- why did BMW make it so easy to do when they could have easily sorted this?
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