03-13-2019, 10:41 AM | #1 |
Brigadier General
2162
Rep 4,104
Posts |
CG Precision Variable Sound Controller (VSC-2) Questions
Question. Does it hurts having the flaps most time in closed position? Just moved in a gated community and cutting my commute time, so don’t really need that much sound specially in the morning. Means I would like to drive with closed flaps.
__________________
|
03-13-2019, 11:32 AM | #4 |
Major General
4969
Rep 6,854
Posts |
Definitely no harm. Dont even need a valve controller for this, just keep it in efficient setting where the valves are closed except heavy throttle and high rpm applications.
|
Appreciate
0
|
03-13-2019, 12:19 PM | #5 |
Brigadier General
2162
Rep 4,104
Posts |
Okay, thanks!
__________________
|
Appreciate
0
|
03-13-2019, 06:17 PM | #6 |
Major
521
Rep 1,105
Posts |
In other cars you would see a difference in blackening of the tailpipes depending on the position of the flaps but not with the design in this car according to BMW. I drive with my flaps open constantly and I need to clean the two outer tailpipes more. If you keep them constantly closed you will notice the same for the two inner tailpipes.
In theory: with the flaps closed you might loose very little power at high RPM because of the increased backpressure. With the flaps open you might loose a little bit of power at low RPM because of the decreased backpressure. This has to do with the valve overlap. We are probably talking about 1 kW of power and 1 Nm of torque in difference. In practice: in all honestly you will not notice and I doubt that this is measurable thanks to the turbos and the catalytic converters. The flaps are there primarily for the exhaust note and at low RPM they remain closed to prevent drone as well. I keep them open and I never shift to below 2000 RPM because of the exhaust drone in the range of 1300 RPM to 2000 RPM. Instead of keeping them closed constantly you could stick to the OEM mode and have the DME activate them. Like gatorfast mentioned in Efficient mode they remain closed. Last edited by G4BR13L; 03-13-2019 at 06:49 PM.. |
Appreciate
0
|
03-14-2019, 09:40 PM | #7 |
BimmerPost Supporting Vendor
23784
Rep 190,128
Posts |
Let me know if you decide to get this part
__________________
Check out our current sale by clicking on this link!
https://x-ph.com/sale/ Phone number 702-494-9435 |
Appreciate
0
|
03-14-2019, 10:27 PM | #8 |
Banned
1193
Rep 3,670
Posts |
|
Appreciate
0
|
03-15-2019, 10:41 AM | #10 |
BimmerPost Supporting Vendor
23784
Rep 190,128
Posts |
__________________
Check out our current sale by clicking on this link!
https://x-ph.com/sale/ Phone number 702-494-9435 |
Appreciate
0
|
03-18-2019, 10:05 AM | #11 | |
Major
521
Rep 1,105
Posts |
Quote:
"In practice: in all honestly you will not notice and I doubt that this is measurable thanks to the turbos and the catalytic converters. The flaps are there primarily for the exhaust note and at low RPM they remain closed to prevent drone as well." |
|
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|