Waffles
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Posts posted by Waffles
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On 19/12/2017 at 18:24, Erni902 said:
Just my 2 pennies worth. I have a decatted Nismo system so not quite the same as your setup. The drone for me is not too bad I don't really tend to notice it. The issue I have is that when I have my daughter in the car she talks quite softly and I end up getting out the other end having agreed to cinema trips and toys and days out etc. and its costing me a fortune.
To that end I've been looking at soundproofing and what I am planning is to use something like dynamat across the entire boot floor and the transmission tunnel (although I will probably end up doing the entire floorplan whilst the carpet is out). This will stop the vibrations/rattles etc being transmitted around the shell. The next step is to add a layer of foam to absorb soundwaves. Then on top of this I am looking at some sort or rubber type sound blocker.
Not entirely sure if this will cut out the specific frequencies I'm after but hopefully should make a difference. I have experienced this in another car and did the above 3 phase sound deadening and it did make such a difference so Im hoping I will notice the difference in the Zed aswell.
Hope this helps mate.
Interesting to hear you've had some success in sound deadening. From what I've read elsewhere, deadening works to stop rattles but isn't so effective on lower dB noises like exhausts.
I've already coated my boot in Dynamat and a little of the Dodo MLV with very little benefit. I'm guessing it will need to have the whole floor and boot with the thicker deadening stuff to really have an impact
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On 19/12/2017 at 14:11, Bigjimg said:
Have a watch here, my car at 70mph mostly with Cobra system including high flow Cobra cats.
No real drone at all mainly road noise.
https://www.youtube.com/watch?time_continue=185&v=3TTS9B-eG9M
That sounds really nice. I tried to take a similar video of mine for contrast, but it really didn't pick up the low noise at all. Hopefully there will be a meetup at some point that I can get to; guess there's no substitute for hearing it in person :-)
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On 17/12/2017 at 19:46, Irn Bru said:
Are exhaust bungs an option for your system ?
None that I've seen. I had a chat with the nice folks at Cobra but they didn't suggest anything like this, so I'm guessing it's not an option
On 17/12/2017 at 20:33, davey_83 said:Resonated or non resonated system?
It's the resonated version.
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It's been a couple of months since I took the plunge and upgraded my '08 350z to Berks HFC and Cobra exhaust + Y-Pipe. With it all added and the engine re-tuned it's a joy to drive.
But that drone....
I do a lot of motorway driving, and 2000-2500 revs there is some serious cabin noise. Trawling through the forums lots of people say that the drone fades as the carbon builds up, but no such luck (at least so far).
I know exhaust notes and noise is a very subjective thing, so I've tried to get some sort of measurement. Here's Android's guess at the noise levels in 6th doing 60mph:
Not the most accurate measuring device in the world, but hopefully gives you a better idea. As for the frequency, it's the 125Hz range that's the culprit:
So a question to all the exhaust gurus out there: What are my options?
From what I've read so far:
1. Swap back to the stock cats
2. Swap out the Cobra to another exhaust
3. Sound proof the **** out of the boot
4. Ignore it and eventually it will get quieter/I will lose enough hearing to ignore it :-)
Hard to answer without being subjective I know, but what would people recommend?
Or if someone is in Hampshire/Berkshire area and fancies a winter meet-up?
After 2 months with Berks + Cobra
in Exhaust
Posted
It may well come to that. Well you can have first dibs ;-)