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msweet
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Alright, I have bought the equipment. 100mm adjustable rubber connector into 100mm pvc pipe with a step down pipe at the end. Plan on putting either 90mm foam plugs in the middle of the pipe (drill through holes) or wrap the inside with foam insulation. Will test both methods.
Baseline test with a free iPhone app had the cold start at 103dB... (edit: with my phone on the ground about a foot away from the exhaust tip)
Baseline test with a free iPhone app had the cold start at 103dB... (edit: with my phone on the ground about a foot away from the exhaust tip)
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msweet
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The project was a success. For $50 and about half an hours time I created two mufflers that substantially reduce the volume on cold start up. Below is a picture of the first muffler I built.
I'm not convinced of the accuracy of my free iphone app, but Corsa Xtreme cold start was measured at 104dB, this morning with the mufflers it was 94dB. I think in theory 10dB increase is 2x volume, so I have effectively halved the noise level - my ear tells me it's about stock level now. I can tell you that it is now quieter than my mum's stock A45 on cold start.
When I get an extra pair of hands I will take a video with & without.
Flame me if you wish, but I'm happy now that I can keep the Xtreme and not have to worry about upsetting the neighbours in my new apartment block (until my housewarming at least)
I'm not convinced of the accuracy of my free iphone app, but Corsa Xtreme cold start was measured at 104dB, this morning with the mufflers it was 94dB. I think in theory 10dB increase is 2x volume, so I have effectively halved the noise level - my ear tells me it's about stock level now. I can tell you that it is now quieter than my mum's stock A45 on cold start.
When I get an extra pair of hands I will take a video with & without.
Flame me if you wish, but I'm happy now that I can keep the Xtreme and not have to worry about upsetting the neighbours in my new apartment block (until my housewarming at least)
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apsilon
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Isn't it a 10db difference is 10 times the intensity? So 100db is 10x the intensity (which for the average person means loudness) of 90db. I could be wrong, I've never been interested enough to look into it, I just know over 100db is getting pretty loud.
Good job either way
car
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Pretty clever good neighbour!
Mustang_Lou
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So you're driving away with that then taking it off away from the neighborhood??
I applaud your desire to be a good neighbor but that looks like ass.
I applaud your desire to be a good neighbor but that looks like ass.
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SoulTea
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Got my Xtreme system sitting in the basement waiting to go on in spring. If I find I'm in the same trouble I might have to rig up the same thing haha. Awesome fix man! Would love to see a video of cold starts with it on and off to show the difference.
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msweet
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Had a few requests for a before/after video, so I've created an album on Flickr. Anyone interested in hearing how loud the corsa is on cold start, take a look. Apologies for the shitty video, the stang connected via Bluetooth and buggered it up haha. Will get another one at some point
https://flickr.com/photos/145261781@N02/sets/72157673240998454
https://flickr.com/photos/145261781@N02/sets/72157673240998454
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msweet
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I've had a lot of requests for parts/guide etc on this, so I'll post up everything I bought below. It's pretty self explanatory how it all goes together, and there are pics in the album to show it completed.
https://flic.kr/s/aHskHDXT4m here's the link to photos of it all done
This is the step down that I bought https://www.bunnings.com.au/holman-90-x-75-x-65-x-50-x-40mm-storm-pvc-stepped-adaptor_p4760090
And this is the foam plug https://www.bunnings.com.au/icon-plastics-80mm-downpipe-plug_p4779566
This is the rubber adapter I bought (below), but the opening is too big for the tips. You might want to get creative and come up with another solution. Currently I have some foam insulation inside to protect the tip, but I have to butt something heavy up behind the pipe so it doesn't blow off when I start the car, if that makes sense
https://www.bunnings.com.au/deks-industries-100mm-pvc-to-80-90-pvc-rubber-jenco-joiner_p4730879
Before you go to the hardware store, measure the OD of the tip, so you can compare different fittings.
I did also put some foam insulation in there, but can't find on the website. You should find similar at any hardware store.
Hope that all makes sense
Cheers
Matt
https://flic.kr/s/aHskHDXT4m here's the link to photos of it all done
This is the step down that I bought https://www.bunnings.com.au/holman-90-x-75-x-65-x-50-x-40mm-storm-pvc-stepped-adaptor_p4760090
And this is the foam plug https://www.bunnings.com.au/icon-plastics-80mm-downpipe-plug_p4779566
This is the rubber adapter I bought (below), but the opening is too big for the tips. You might want to get creative and come up with another solution. Currently I have some foam insulation inside to protect the tip, but I have to butt something heavy up behind the pipe so it doesn't blow off when I start the car, if that makes sense
https://www.bunnings.com.au/deks-industries-100mm-pvc-to-80-90-pvc-rubber-jenco-joiner_p4730879
Before you go to the hardware store, measure the OD of the tip, so you can compare different fittings.
I did also put some foam insulation in there, but can't find on the website. You should find similar at any hardware store.
Hope that all makes sense
Cheers
Matt
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