Hi Gents,
Hi guys been curious about this. My 28i on start with a growl but after something like 40 sec it quiets down.
Originaly I thought it was the flap in the rear muffler is closed but when I peak it remains fully open.
So where or what is it that quiets the exhaust if the flap remains fully open ?
Thanks Gents
Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.
Question about exhaust sound level
- Smartbear
- Lifer
- Posts: 13685
- Joined: Wed Feb 05, 2014 6:54 pm
- Location: a barn in Somerset
Question about exhaust sound level
They’re noisy on startup due to the vacuum pump blasting air through the cat to lower emissions, when that stops the noise subsides.sumotan wrote: ↑Sun Mar 28, 2021 12:13 pm Hi Gents,
Hi guys been curious about this. My 28i on start with a growl but after something like 40 sec it quiets down.
Originaly I thought it was the flap in the rear muffler is closed but when I peak it remains fully open.
So where or what is it that quiets the exhaust if the flap remains fully open ?
Thanks Gents
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
-
- Member
- Posts: 241
- Joined: Fri Oct 30, 2020 3:31 pm
Question about exhaust sound level
Aaah many thanks again Smartbear.
I've now got Catless downpipe & it sounds really good when its noisy lol there after I loose that growl.
I've now got Catless downpipe & it sounds really good when its noisy lol there after I loose that growl.
- Smartbear
- Lifer
- Posts: 13685
- Joined: Wed Feb 05, 2014 6:54 pm
- Location: a barn in Somerset
Question about exhaust sound level
You can disconnect the exhaust valve for a little more sound
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
-
- Member
- Posts: 241
- Joined: Fri Oct 30, 2020 3:31 pm
Question about exhaust sound level
Thanks again Rob
-
- Member
- Posts: 91
- Joined: Sat May 25, 2019 9:57 am
Question about exhaust sound level
Here's one in a similar vein - why does my N52 sound quieter when the e-brake is on if I blip the throttle? I don't sit revving the thing but just noticed and thought it was odd. If I'm right there's no valve in the exhaust (no golf-tee mod on the 30i).
2009 sDrive30i, deep sea blue, ivory