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Personally I feel really sorry for all these people that moved into new housing estates only to find race circuits like Brands Hatch suddenly being built next door. Obviously if they moved into a new

a french specialist offers silencers for OEM backbox, in order to be able to drive the most restrictive tracks ... can't talk about efficiency nor reliability, I just give the info !  

I know this may sound like a stupid question,  but why are track noise levels so fussy ! i mean the noise of level allowed at some is just way to low. ?  Why ? is it health and safety, to stop no

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

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I know this may sound like a stupid question,  but why are track noise levels so fussy ! i mean the noise of level allowed at some is just way to low. ? 

Why ? is it health and safety, to stop noise pollution ?   I just can not understand why it is so strict, its a racing track for gods sake ?

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A

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NIMBY's. 

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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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Standard exhaust is fine in the UK - I make this blanket assertion on the basis that I had no problems at Bedford, which is notorious for its NIMBY imposed noise limit.

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3 hours ago, Gashead1105 said:

Standard exhaust is fine in the UK - I make this blanket assertion on the basis that I had no problems at Bedford, which is notorious for its NIMBY imposed noise limit.

My 1000 mile old standard exhaust failed a noise test at brands hatch. Static was 98db after lunch it had risen to 101db. So sadly the standard exhaust won't pass noise test if you are using the full power/ rev range available. Well mine doesn't!!!

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Thanks for the info guys. I usually drive in Jarama circuit and there is a peculiar rule. There is noise restriction but only in a sector of the track (which is the nearest to the close neighbourhood). And is very frustating  to speed down when you are doing a fast lap!! :angry:

 

By the way: eventhough that disadvantadge you should come to Jarama. Is a great circuit !!!

 

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13 hours ago, Seriouslylotus said:

My 1000 mile old standard exhaust failed a noise test at brands hatch. Static was 98db after lunch it had risen to 101db. So sadly the standard exhaust won't pass noise test if you are using the full power/ rev range available. Well mine doesn't!!!

Ok, well I haven't done Brands for a while and am not going to do so in the near future. However I thought the 360 cup ran the lotus sports exhaust, not the pig snout that is on the standard V6? For the record my last static tests at Snetterton were 93 and 96 db respectively so I would be fine on then above. Done just over 4k miles. You are going to have a problem Dave as there aren't any after market alternatives that are quieter than OE so far as I am aware.

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1 hour ago, Gashead1105 said:

Ok, well I haven't done Brands for a while and am not going to do so in the near future. However I thought the 360 cup ran the lotus sports exhaust, not the pig snout that is on the standard V6? For the record my last static tests at Snetterton were 93 and 96 db respectively so I would be fine on then above. Done just over 4k miles. You are going to have a problem Dave as there aren't any after market alternatives that are quieter than OE so far as I am aware.

Car came with both! Used pig snout first and lotus sport second.

I am in the process of sorting a track friendly exhaust for my car as all the currently available offering miss the mark for me

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The Komotec with the valve closed is very quiet for what it is. Perfect for noise restricted tracks, but you may have to ease off past certain points of the track possibly. Even valve open its not too bad actually, certainly seems the best aftermarket exhaust for track so far. 

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My 2bular track system is 107 db on its own, 98/99 with stainless add ons.. I know Jim was going to make a silenced Manifold to backbox section too for someone, not sure if he has had time to do it yet.

there is the universal helping hand of....... whats the redline mate..... 6000....... several db less.

2 hours ago, Gashead1105 said:

Ok, well I haven't done Brands for a while and am not going to do so in the near future. However I thought the 360 cup ran the lotus sports exhaust, not the pig snout that is on the standard V6? For the record my last static tests at Snetterton were 93 and 96 db respectively so I would be fine on then above. Done just over 4k miles. You are going to have a problem Dave as there aren't any after market alternatives that are quieter than OE so far as I am aware.

What revs was that at please?

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43 minutes ago, RedViper said:

My 2bular track system is 107 db on its own, 98/99 with stainless add ons.. I know Jim was going to make a silenced Manifold to backbox section too for someone, not sure if he has had time to do it yet.

there is the universal helping hand of....... whats the redline mate..... 6000....... several db less.

What revs was that at please?

When you are on a lot day they know the redlines/limits of the cars concerned. My tests where all done at 5250rpm.

Using a lower rpm is only going to work for so long as once out on circuit if your car is too loud they will find you!!!

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2 hours ago, Seriouslylotus said:

When you are on a lot day they know the redlines/limits of the cars concerned. My tests where all done at 5250rpm.

Using a lower rpm is only going to work for so long as once out on circuit if your car is too loud they will find you!!!

It was said tongue in cheek. The 2bular track seems to plateau off with db after about 4500 revs anyway. Something to do with how it's built.... Witchcraft. 

1 hour ago, Gashead1105 said:

96 db was at 5,200 with the valve open

93 db was at a little less, still with the valve open.

Wow.

that certainly quieter than mine ever was stock. 

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Mine was 98 at 5500 with valve open before lunch (Pig snout switchable exhaust)

and 101 at 5250 with valve open after lunch.(Pig snout switchable exhaust)

I then fitted the Lotus sport exhaust as supplied with the car and that was 98 at 5250 (new exhaust, never used before)

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22 minutes ago, Seriouslylotus said:

Mine was 98 at 5500 with valve open before lunch (Pig snout switchable exhaust)

and 101 at 5250 with valve open after lunch.(Pig snout switchable exhaust)

I then fitted the Lotus sport exhaust as supplied with the car and that was 98 at 5250 (new exhaust, never used before)

Maybe it's more a quirk of car that it's gets quieter at higher revs ha ha. So if in doubt Rev it higher ?

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