Don
- Joined
- 20 Oct 2002
- Posts
- 17,044
- Location
- In a house
Anyone ever done the "exhaust valve delete" to use the american vernacular on their BM?
My 750i is very refined, and refuses to make much noise on low revs. Turns out its fitted with a vacuum operated exhaust blanking valve to close one of the back boxes on low load. I have removed the vacuum hoses from the solenoid, and stuck a small plastic bleed valve in between. When closed, it keeps the valve open in the second back box, and I am hoping to get a nicer throaty roar lower down as a result
Very easy to do, and hopefully when I drive it in the morning, it will make a difference to the noise! I don't want it to be too shouty, but hoped this might just liven it up a bit!
Will report back tomorrow
My 750i is very refined, and refuses to make much noise on low revs. Turns out its fitted with a vacuum operated exhaust blanking valve to close one of the back boxes on low load. I have removed the vacuum hoses from the solenoid, and stuck a small plastic bleed valve in between. When closed, it keeps the valve open in the second back box, and I am hoping to get a nicer throaty roar lower down as a result
Very easy to do, and hopefully when I drive it in the morning, it will make a difference to the noise! I don't want it to be too shouty, but hoped this might just liven it up a bit!
Will report back tomorrow