Exhaust Actuator
11 September 2007, 03:17 PM
#1
Exhaust Actuator
What the hell is he talking about you may ask.
I was at a car salvage yard on the weekend, and spotted a MG ZR. My mate said it was one of the faster ones a 180 model.
It had the rear bumper missing, and I noticed an actuator on one of the tailpipes, it had a twin set up. I've never seen this before, and should have taken a picture.
Any one seen/heard of this before? Whats it for, noise restrictions? Couldn't find much about it on the net.
Took a picture:
I was at a car salvage yard on the weekend, and spotted a MG ZR. My mate said it was one of the faster ones a 180 model.
It had the rear bumper missing, and I noticed an actuator on one of the tailpipes, it had a twin set up. I've never seen this before, and should have taken a picture.
Any one seen/heard of this before? Whats it for, noise restrictions? Couldn't find much about it on the net.
Took a picture:
Last edited by joey_turbo; 19 September 2007 at 04:06 PM. Reason: picture added
11 September 2007, 03:32 PM
#3
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Some modern cars have a valve in the exhaust to allow for a better flow rate at high revs, its some loop hole in sound/emissions limits becuase they are only tested to a certain point.
11 September 2007, 03:35 PM
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This is probably like the MGTF I had. It has a valve to close off one of the pipes when driving at low revs (under 3K) and its only purpose was to reduce noise.
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11 September 2007, 05:44 PM
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BMWs do.
Noted a brand new 535d with one on the right-most tailpipe. As it was new you could clearly see it, as it had yet to carbon up.
Probably a by-pass for the baffles in the rear box. Shut at low revs/speed for to pass noise emissions, opens up at revs to give the driver more "aural" satisfaction. And maybe give 2bhp more power - if your lucky
Or if you belive the marketing boys - 20bhp extra 
My 325 touring has one...apart from it appears to have broken and is stuck open....always wondered why it sounded a bit more rorty than other 6pot beamers.
Ferarri was one of the main cars to baost about them being fitted
Noted a brand new 535d with one on the right-most tailpipe. As it was new you could clearly see it, as it had yet to carbon up.
Probably a by-pass for the baffles in the rear box. Shut at low revs/speed for to pass noise emissions, opens up at revs to give the driver more "aural" satisfaction. And maybe give 2bhp more power - if your lucky
Or if you belive the marketing boys - 20bhp extra My 325 touring has one...apart from it appears to have broken and is stuck open....always wondered why it sounded a bit more rorty than other 6pot beamers.
Ferarri was one of the main cars to baost about them being fitted
Last edited by Shark Man; 11 September 2007 at 05:47 PM.
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