The Noise Conundrum!

The Noise Conundrum!

Author
Discussion

firewallguy

Original Poster:

192 posts

150 months

Wednesday 22nd October 2014
quotequote all
Milky400 said:
A mate of mine has a monaro vxr with a electrically switchable silencer. Amazing piece of kit. I must say my tuscan is extremely quiet at 60-70 cruising not sure if it's been fettled with previously but suits me for long journeys and been commented on how quite it cruises.

As much as I love the noise at full pelt I must say its nice to be settled on a run
If I had the self control/patience to keep between 60 and 70 on a long run it isn't actually too bad, but going just that bit faster to keep up with everyone else puts it right in the 'boom' zone.

I've been reading some older posts that say linked decats can take the edge off the noise so I may consider that in the future.

purpleliability

627 posts

184 months

Wednesday 22nd October 2014
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ukkid35 said:
That's good of Joolz to do a side by side comparison for you!

I may go see Charlie at SRR and ask for a side by side as well, but not until I've done my valve clearances.
When we chatted (he was doing my 12k service), it transpired that he'd never tested one before, hence this run.

If you have the ACT big bore version and track cans, talk to Tim, he took mine back and modified them to have the pipes removable. Top chap!

Mags

1,131 posts

278 months

Thursday 23rd October 2014
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a1rak said:
I've got the latest 6 silencer quiet ACT system and it comes in at just under 100db with no CAT's so is perfect for track days. It is expensive but still has a really nice sound and makes long journeys a pleasure. Sticking any restriction up the exhaust will cause a power loss or worse as it can badly effect the fuelling and damage your engine.

The problem with the bypass pipes will be room. If you are going to keep large bore pipes for sound and power you need a massive amount of space to fit in enough silencers and then on top of that you need the bypass pipework ....I just don't think it will ever fit. You will have to use small bore pipe which would negate the need for a bypass system.

I would go the ACT route, I'm glad I did and so are my neighbours

I've gone the full ACT quiet route with decat (not linked) the silenced centre section and the large box across the back. I think it makes a really nice purposeful sound without being all max-power but the pops and bangs are much quieter than I've heard on Youtube etc.
Being too loud is not always a good thing IMHO, people can hear you from far too far away. No idea on DB reading on mine though, not been on a track day.

LooneyTunes

6,779 posts

157 months

Friday 24th October 2014
quotequote all
a1rak said:
I've got the latest 6 silencer quiet ACT system and it comes in at just under 100db with no CAT's so is perfect for track days. It is expensive but still has a really nice sound and makes long journeys a pleasure. Sticking any restriction up the exhaust will cause a power loss or worse as it can badly effect the fuelling and damage your engine.

The problem with the bypass pipes will be room. If you are going to keep large bore pipes for sound and power you need a massive amount of space to fit in enough silencers and then on top of that you need the bypass pipework ....I just don't think it will ever fit. You will have to use small bore pipe which would negate the need for a bypass system.

I would go the ACT route, I'm glad I did and so are my neighbours
Out of curiosity, how much quieter is the ACT at low revs? I'm on the look out for something that is (or can be) quieter when arriving/leaving home or on a gentle cruise with the kids in the car but still has the presence when you want it. A switchable system would be ideal...

Gazzab

21,061 posts

281 months

Friday 24th October 2014
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Ridds with his jag and Aston connections must be the man to design us a switchable system :-)

Llanelli-Rob

533 posts

223 months

Friday 24th October 2014
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The switchable solonoid flap gizmo's are extremely popular with the boating fraternity who run big Chev V8's....reason being they set to below water exhaust while in the marina then flick a switch to redirect to above water while away from the noise restricted areas.
Looked at one of these systems on a friends loony american 7ltr plus boat a few years ago and was extremely impressed with the quality, being a marine application it was manufactured in stainless...
Would imagine it would be easy to adapt an out of thebox kit to suit.
Rob.

Boatbuoy

1,941 posts

161 months

Friday 24th October 2014
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I looked into doing a switchable system not so long ago. I produced a concept design and sourced a supplier for the required parts but got side tracked by the total rebuild of my car.

If there was serious interest I could look at re-visiting this.

Olly

gruffalo

7,509 posts

225 months

Friday 24th October 2014
quotequote all
LooneyTunes said:
a1rak said:
I've got the latest 6 silencer quiet ACT system and it comes in at just under 100db with no CAT's so is perfect for track days. It is expensive but still has a really nice sound and makes long journeys a pleasure. Sticking any restriction up the exhaust will cause a power loss or worse as it can badly effect the fuelling and damage your engine.

The problem with the bypass pipes will be room. If you are going to keep large bore pipes for sound and power you need a massive amount of space to fit in enough silencers and then on top of that you need the bypass pipework ....I just don't think it will ever fit. You will have to use small bore pipe which would negate the need for a bypass system.

I would go the ACT route, I'm glad I did and so are my neighbours
Out of curiosity, how much quieter is the ACT at low revs? I'm on the look out for something that is (or can be) quieter when arriving/leaving home or on a gentle cruise with the kids in the car but still has the presence when you want it. A switchable system would be ideal...
Much is the answer, you can hold a comfort conversation with a passenger and even use the phone with a blue tooth device at motorway speeds, put you foot down and you get a lovely deep guttural growl from the back.

I moved to the quiet system after failing noise testing too many times with the large bore sports system, I prefer it on the whole as well though it does not set off as many car alarms.


Gazzab

21,061 posts

281 months

Friday 24th October 2014
quotequote all
Boatbuoy said:
I looked into doing a switchable system not so long ago. I produced a concept design and sourced a supplier for the required parts but got side tracked by the total rebuild of my car.

If there was serious interest I could look at re-visiting this.

Olly
I'd be interested. I love the sound of mine plus it has larger rear pipes that are cut at an angle and aren't poking out as far as the std exhaust. So to have the look of current system but with extra silencing that can be bypassed would be great.

OutlawFlat4

697 posts

146 months

Friday 24th October 2014
quotequote all
Boatbuoy said:
I looked into doing a switchable system not so long ago. I produced a concept design and sourced a supplier for the required parts but got side tracked by the total rebuild of my car.

If there was serious interest I could look at re-visiting this.

Olly

I would be interested in making it louder and quieter wink.... I have the ACT Sports exhaust, if that makes any difference?

Boatbuoy

1,941 posts

161 months

Friday 24th October 2014
quotequote all
My plan involved a system based upon the 'standard' back box that had a bypass to give a 'sports' system sound. It would therefore look completely normal when fitted to the car. I think I got to the point of realising that space is pretty tight.

As I said, I'd be happy to have another look into it.

Olly

OutlawFlat4

697 posts

146 months

Friday 24th October 2014
quotequote all
Boatbuoy said:
My plan involved a system based upon the 'standard' back box that had a bypass to give a 'sports' system sound. It would therefore look completely normal when fitted to the car. I think I got to the point of realising that space is pretty tight.



As I said, I'd be happy to have another look into it.

Olly
Would be interested to hear what you come up with but the majority are looking to go the other way and make it quieter.... Let us know how you get or if you need any of us to help out in any way?

LooneyTunes

6,779 posts

157 months

Friday 24th October 2014
quotequote all
gruffalo said:
LooneyTunes said:
a1rak said:
I've got the latest 6 silencer quiet ACT system and it comes in at just under 100db with no CAT's so is perfect for track days. It is expensive but still has a really nice sound and makes long journeys a pleasure. Sticking any restriction up the exhaust will cause a power loss or worse as it can badly effect the fuelling and damage your engine.

The problem with the bypass pipes will be room. If you are going to keep large bore pipes for sound and power you need a massive amount of space to fit in enough silencers and then on top of that you need the bypass pipework ....I just don't think it will ever fit. You will have to use small bore pipe which would negate the need for a bypass system.

I would go the ACT route, I'm glad I did and so are my neighbours
Out of curiosity, how much quieter is the ACT at low revs? I'm on the look out for something that is (or can be) quieter when arriving/leaving home or on a gentle cruise with the kids in the car but still has the presence when you want it. A switchable system would be ideal...
Much is the answer, you can hold a comfort conversation with a passenger and even use the phone with a blue tooth device at motorway speeds, put you foot down and you get a lovely deep guttural growl from the back.

I moved to the quiet system after failing noise testing too many times with the large bore sports system, I prefer it on the whole as well though it does not set off as many car alarms.
Hmmm... tempting. I did get a bit orief from colleagues when I did a conf call from the car! It would be nice to have it Jekyll & Hyde though (standard to quiet).

I don't really need to go quiet for track work as I have a different weapon for those days...

ukkid35

6,137 posts

172 months

Friday 24th October 2014
quotequote all
I envy those of you who live in mansions without neighbours to appease.

Gazzab

21,061 posts

281 months

Friday 24th October 2014
quotequote all
ukkid35 said:
I envy those of you who live in mansions without neighbours to appease.
My neighbour has more than 25 cars, most of which are astons. They are all very old and very noisey (and each worth a small fortune). But the noise can be annoying. Especially when the transporters arrive to take a load of them off for servicing and repairs. Reminds me to keep the revs down!

ukkid35

6,137 posts

172 months

Friday 24th October 2014
quotequote all
Gazzab said:
My neighbour has more than 25 cars, most of which are astons. They are all very old and very noisey (and each worth a small fortune). But the noise can be annoying. Especially when the transporters arrive to take a load of them off for servicing and repairs. Reminds me to keep the revs down!
You are obviously making that up! (JK)

Gazzab

21,061 posts

281 months

Saturday 25th October 2014
quotequote all
ukkid35 said:
Gazzab said:
My neighbour has more than 25 cars, most of which are astons. They are all very old and very noisey (and each worth a small fortune). But the noise can be annoying. Especially when the transporters arrive to take a load of them off for servicing and repairs. Reminds me to keep the revs down!
You are obviously making that up! (JK)
Nope not all. It's true. They are all rare v early astons (those that are astons that is).

Vee8ight

734 posts

138 months

Saturday 25th October 2014
quotequote all
I have a working switchable system on my Cerb, 93.8 dB (measured this week at Cadwell) with no cats, and around 140 DB straight through.

All self built, and all within the confines of the backbox area. I'm currently on version 2, still tweaking and making it better.

Daz

scerbera

102 posts

113 months

Saturday 25th October 2014
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Vee8ight said:
I have a working switchable system on my Cerb, 93.8 dB (measured this week at Cadwell) with no cats, and around 140 DB straight through.

All self built, and all within the confines of the backbox area. I'm currently on version 2, still tweaking and making it better.

Daz
any pics?

I have a fair idea what i'm going to do, they are horrendously loud on a decent journey, maybe 30 miles or more you just get out thinking thank flip that is over! in terms of noise of course. nice drive but the noise is a killer. looking for a track day in november but limit is 100 so will need to sort a system sharpish.

mk1fan

10,507 posts

224 months

Saturday 25th October 2014
quotequote all
I have two butterfly valves sitting in box. They came with Tamy but I had no interest in fitting them. Manual activation.

If anyone is interested they can pm me. They are at home at the moment and I'm not there until Tuesday.