Exhaust noise - cabin vent

Re: (TwoDogs)

Wed, 13 Jun 2018 22:55:52 GMT

Thanks 5sgte, I have been there and yes it has good stuff.

Re: (5SGTE)

Wed, 13 Jun 2018 20:22:14 GMT

Have you checked out 'sound deadener showdown'? Some great stuff on there.

Re: (TwoDogs)

Wed, 13 Jun 2018 16:06:28 GMT

More on the engine drone. I was sitting at the lights the other day and a big thumper pulled up next to me.
Either a Harley or a Trumpy or something. With my windows closed I could hear and feel the bike idling and it
was all coming through the floor. So although I have put some vinyl sheets on the floor, it is not enough. Thinking about pouring fiberglass resin on the floors to increase the weight....might try one side first. Bonus would be that my subw would cause less doof, doof for my fellow roadusers. There will undoubtedly still some engine drone in the cockpit but any reduction makes the music nicer.

Re: (TwoDogs)

Wed, 02 May 2018 18:07:54 GMT

I think you're right Salem, despite my efforts the droning continues. Certainlky road noise is down but it pales in significance. I suspect even the poly rear window may transmit some of the droning.
Just as woofer noise goes out the body shell, I suspect low freq exhaust noise to bounce off the road into the cabin.

Re: (Guest)

Fri, 20 Apr 2018 19:50:17 GMT

Check the exhaust over for any leaks. Second option - electric exhaust valve motor. They are throttle body like valves, that can be installed towards the end of your exhaust system and hooked into the vehicle wiring (depending on ecu or aftermarket switch maybe required). At low throttle the valve sits partially open, reducing airflow and sound, at open throttle they open for full flow. ATS Racing facebook page had a post a while back.

Re: (salem)

Fri, 20 Apr 2018 16:59:01 GMT

So I didn't find any obvious noise entry points. Droning is also audible out the left hand passenger side (as reported by aggravated girlfriend) so I suspect my exhaust is just a noisy sod. Might get the mechanic to check for exhaust leaks/mounting issues. The exhaust does also have an annoying rattle at just the right speed/revs.

Re: (salem)

Sun, 28 Jan 2018 17:41:31 GMT

Sadly I've been too busy to have a crack at it yet. And/or when I do have spare time it's way too bloody hot to be mucking about with the car. I have a few weeks off work now though so I should be able to get in there in a few days or so.

Re: (Admin)

Sun, 28 Jan 2018 11:06:30 GMT

Did it work?

Re: (TwoDogs)

Fri, 19 Jan 2018 11:51:00 GMT

Done the funnel in the hose trick, works brilliantly for finding hissing leaks around an engine and no reason why
it won't work in this case. Quite precise.
I am in the middle of soundproofing my Sdub and behind the panel behind the driver's shoulder, is a hole for the seat belt mounting and a hole for the rear crap speaker (removed). That cavity brings a ton of fan and rear tyre noise into the cabin. The same cavity on the other side also, but no fan. If there is one place to fix, that is it. I have lined the cavity with stick on vinyl and filled the cavity (mind a couple of cables) with high density foam. All up 2hrs and $40 (at a guess.) I need to complete some other tasks before driving to confirm the result.

Re: (Reddtarga)

Sun, 31 Dec 2017 10:57:01 GMT

You could make the garden hose more sensitive if you tape a small plastic funnel to the end of it.
Great for tracking down other noises as well.
Or even better, ask your doctor to lend you a stethoscope.

Re: (salem)

Sun, 31 Dec 2017 10:24:08 GMT

You have a hidden camera set up near my car to record the hilarious nature of this test, don't you? But cheers for the tip

Re: (Admin)

Sun, 31 Dec 2017 10:03:20 GMT

Get a length of garden hose, stick one end in your ear, the poke the other end around inside the cabin behind the seat while the engine is running. If there is a leak, you will be able to hear where it is through the hose.

Re: (salem)

Sun, 31 Dec 2017 09:52:23 GMT

Is that something I can find myself, or does the engine need to come out ? (Please god no)

Re: (Admin)

Sun, 31 Dec 2017 09:23:30 GMT

There may be a hole in the firewall I.e. A missing rubber bung.

Re: Exhaust noise - cabin vent (salem)

Sat, 30 Dec 2017 20:21:33 GMT

Yeah I guess I'm just assuming. I'll pop a temporary makeshift muffle patch over it and see how I go.