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Cup pipe?

Yep, I think you're right Jamie -I can only remember being given the dreaded red sticker at 107db [:)](before I removed the Cup Pipe!) on an RMA day, but they suggested I familiarise myself with the position of the four track side mikes on the warm up laps and short change or ease off by them.[;)]

Fine all morning, then after lunch I thought, "B*ll*cks -let's go for it" [:D]-black flag out within one lap......[:(] They only let me back out because I behaved in the morning!! Jobsworths......this airfield is in the middle of nowhere!!!!![:mad:]

Rgds
Mel
 
I know what you mean - I just can't see why they need to have a 101db limit, but they're pretty hot on enforcing it at Bedford. I'm fairly resigned to being 'red stickered' (I even managed to get pinged in my boggo 3.2 Carrera once ????), and will just have to be careful . At least I've been there enough times now to know where the mics are around the track ! Anyway the previous owner of my car claimed he had no problem at Bedford, but with a de-cat, Cup pipe and totally open airbox & K&N filter I somehow doubt it !

Jamie
 
I beg to differ Simon, With any reduction in sound proofing around the engine bay area the general mechanical noise will increase and add to the noise figure(this is one of the reasons 911's fail noise tests having the engine so near to the noise meter). I take it you have a Cup Car parts manual? And you are aware that race teams like removing weight from where it can't be seen !
Personally I think the noise should be measured further back for 911's in difference to their unique engine layout. But what are the chances of that happening[:mad:]
 
Laurence

I do have the parts catalogue for all 964's and have checked that it does cover the RS Clubsport. However, to be fair, I have identified one item that isn't in there that the Clubsport does have, namely the roll cage. It also doesn't list the cup pipe! However, it does list the same exhaust for for all European (and UK) 964's (non turbo) except Switzerland.

As for the soundproofing and the difference it makes between models, I am not sure I can agree with you. In fact, I suspect that from outside a roadgoing RS might be noisier than a Clubstort! There is no difference in the car from the rear bulkhead back. However, there is materials that provide some soundproofing across the rear bulkhead of the road car while the Clubsport has nothing. The clubsport has a noisier cabin. Therefore the noise has to go somewhere. If its all absorbed by the the materials that the Clubsport doesn' have, then the Clubsport and the roadgoing RS should sound the same. If any is reflected back into the engine bay, then the road car might be louder.

However, my logic might be totally wrong and I might be missing something.
 
Hmmm i think your thinking is round the wrong way. The standard RS has sound deadening material within the engine bay and has carpet, the secret word here is "deadening" i.e. it kills sound or in other words reduces db. Any reduction in db around the engine bay will show up as a lower db reading on the meter, in theory at least. If you have ever been in a clubsport or a cup car you will begin to understand what I mean about it increasing the mechanical noise! The total removal of all sound deadening and absorbing materials inside the cup and clubsport cars is what goes a long way to making your ears ring a long time after you have been in one of these cars. Whilst it's not too far off a comparison to compare the cup car with a clubsport RS ,Mels car is not on the later RS body (i think, mel?) There are differences between cup, later cup's built on RS platform and clubsport they are small but there. I would not be suprised to find some of the heat shield material normally found in the rear bumper to be missing on a cup car. The more "walls" (heat sheilds, sound deadening etc) in front of the sound, the less sound when listening from the other side of the "wall"!
 
One other point. the roll cage in the clubsport is considered integral to the clubsports body and it therefore has no part number! Want a new cage for your clubsport you order a new clubsport shell with according part number/chassis no! Not that they are availiable anymore anyway [:(]
 
Laurence

I think we are talking cross purposes. i totally agree with you about the noise inside the car but we are talking about the noise level from behind! All the soundproofing is in front of the engine and therefore the noise behind should be the same
 
a small experiment for you. Switch your stereo on turn up the volume and then stand in front of the speakers and then stand behind them. Now repeat placing large piece of card in front of speaker! What happens! I bet it's quiter regarless of where your standing! Pehaps for accuracy you could place the speakers back to back placing card over one speaker the effect would be the same.
ok it's not exactly the same but hopefully you get the idea.
 
Yes, the speaker is an excellent analogy except I would argue that you should place the card BEHIND the speaker. After all, most of the noise from an engine comes out the exhaust. On three sides, icluding the noisiest side, the cars are the same.

Having said all that, I do wonder if the interior acts as a soundbox at all. If it does, then I think that it would be noisier from the side and in front than a standard RS but not from behind. Anyway, as I cannot get to have my current system tested and all I know is its rather loud, this is all very hypathetical although interectually stimulating.
 
"I do wonder if the interior acts as a soundbox at all."

I can vouch for that.... eh? Pardon?

Mel
 
It is very true that most of the noise is generated from the exhaust. When at weisach we were very lucky to be let into Porsche's sound testing facility. A complete anachroic (not sure of the spelling) chamber designed to test the 996 engine for mechanical noise. The exhaust is completely isolated from the engine. it's wierd and quite amazing to hear an engine start up and run with complete absence of exhaust noise. The sound on the 996 engine was reminisent of a sewing machine!
 
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