[Kim]

My two cars are very different. The cab with a tip is very quiet and the engine, even when pushed to redline, sounds like a turbine spinning. Very refined and "new car" like. I have a Murano with a V-6 and it sounds like that does at 6200 rpm.



The coupe, same year with a 6-speed, is LOUD. It could be described as a roar when the throttle is stepped on hard. I still hear the turbine sound but it reminds me of a race car type loudness. It does not have the airbox mod, now has a stock chip, has a stock filter and nobody at Porsche has ever commented that the exhaust system looks like it is wearing out. I am pretty sure that the exhaust system is stock but really don't know how to tell. I have normally assumed that, all things being equal, a coupe would be quieter than a cab. Any thoughts?

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[S_Cal968]

I noticed this too when I bought my coupe; even my 4x4 truck is quieter. There's not a lot of insulation or separation from the rear wheel wells. However the cab has a trunk that contains some of the noise. I've grown use to it, so it's not a big issue.

Choice of tires is also a factor...

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[porsche]

The Coupe's glass hatch acts as a friggin amplifier for road noise!!!!



If only Porsche would have reinforced the cab to the point it could of been optioned with M030!!!!



Oh well.



Porsche

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[flash]

lol - they did - i am WAY past M030 and it works great - i think the reason they didn't offer M030 in the cab had nothing to do with the chassis and entirely to do with marketing and cost

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[Darth Vadar]

Yes, the 968 Coupe is louder than my 944S2 Cab; I was surprised as well!



I put a Lloyd's Rear Mat in the storage area, and then laid a set of (slightly) used Lloyd's Floor Mats over that...



It really helps to soak up the amplified sound from the rear compartment...



The hatch really does seem to act like an amplifier for road noise from the rear wheels.

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[flash]

well, it sort of is - ever look at a picture of an ampitheatre like the hollywood bowl? that backshell really moves the sound forward - good and bad

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[Harvey]

My 968 was TOO QUIET when I got it. Sounded wimpy, like a sewing machine or something(except for the horrible road noise). I installed a B&B muffler and now it sounds like a real sports car.



Harvey

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[RickP]

Wondering if anyone has tried dynamat or anything similar to quiet the road noise and what the results were.



Thanks Rick

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[cdtscout]

[quote name='RickP' post='31399' date='Feb 23 2007, 12:32 PM']Wondering if anyone has tried dynamat or anything similar to quiet the road noise and what the results were.



Thanks Rick[/quote]



Rick,

Yes I have used a variety of dyanmat noise/vibration materials (both liquid and mat type materials) with satisfaction. Many that are perfomance oriented would not install these products due to the added weight. I just love my daily driver 968 and I may be more sensitve to noise and rattles than most....so the tradeoff for me works fine. By the way, I have not noticed any perceptable performance difference...but it sure is nice to ride a bit quieter.

Craig

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[cosimo]

Harvey, I'm with you, mine was too quiet and I installed the B&B exhaust. Love the sound. Just wish I could keep the rear hatch open to hear it resonate. That with the airbox mod makes for a definite improvement in "sound " of the 968.

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[rhudeboye]

[quote name='Harvey' post='27431' date='Oct 29 2006, 09:54 PM']My 968 was TOO QUIET when I got it. Sounded wimpy, like a sewing machine or something(except for the horrible road noise). I installed a B&B muffler and now it sounds like a real sports car.



Harvey[/quote]





[quote name='cosimo' post='31412' date='Feb 23 2007, 01:16 PM']Harvey, I'm with you, mine was too quiet and I installed the B&B exhaust. Love the sound. Just wish I could keep the rear hatch open to hear it resonate. That with the airbox mod makes for a definite improvement in "sound " of the 968.[/quote]



I agree w/ the above. For my taste a sports car should be loud, especially at full throttle.

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[RickP]

[quote name='cdtscout' post='31401' date='Feb 23 2007, 01:33 PM']Rick,

Yes I have used a variety of dyanmat noise/vibration materials (both liquid and mat type materials) with satisfaction. Many that are perfomance oriented would not install these products due to the added weight. I just love my daily driver 968 and I may be more sensitve to noise and rattles than most....so the tradeoff for me works fine. By the way, I have not noticed any perceptable performance difference...but it sure is nice to ride a bit quieter.

Craig[/quote]





Craig,

I am not familiar with the liquid. Where did you use it? Am not worried about a little extra weight, just want to get rid of the road noise.



Rick

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[Cloud9...68]

I'm glad someone posted about this, because I have to agree, the sounds this car makes are my least favorite thing about it. It's not so much the volume, as the tone. It just sort of drones and rumbles, making it sound harsh without being sporty, and cheap. I agree a sports car should make spirited mechanical, intake, and exhaust sounds, but this car sounds like a 10 year old Hyundai.



Interesting comments about the rear hatch amplifying the road noise. I'll have to go for a ride in a cab someday for comparison. Sure wish there were a fix for this...

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[Renalicious]

I usually drive with the windows down when it's warm enough, because at least then I can listen to the exhaust. Even though it's stock I like how it sounds <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" /> Though I have to agree that driving on the highway it's a bit loud.



So now the question is, compared to other cars, is the 968 louder on the outside? And what does the RS Barn exhaust sound like <img src="/forum/images/smilies/968/wink.gif" class="smilie" alt="" />

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[Larry Currie]

The B&B Exhaust is sweet, and adding the air box mod. just makes it sound a little better.

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[cdtscout]

[quote name='RickP' post='31420' date='Feb 23 2007, 05:06 PM']Craig,

I am not familiar with the liquid. Where did you use it? Am not worried about a little extra weight, just want to get rid of the road noise.



Rick[/quote]



Rick,

The liquid product: eDead from Elemental Designs $50 per gallon. I also used some of their "Mat" materials for sound insulation and sound deadening. I used it most anywhere I could..... rear deck/hatch; doors; side panels; entire floor under the carpet (the carpeting was a real pia to remove....I have never seen so much glue); front plastic inner fender wheelwell inserts (liquid only);under the hood. This process has not muted/eliminated the 968's desirable engine sound/music....but has really muted the road/tire noise/droan.

Craig

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[Cloud9...68]

[quote name='cdtscout' post='31446' date='Feb 24 2007, 07:05 AM']Rick,

The liquid product: eDead from Elemental Designs $50 per gallon. I also used some of their "Mat" materials for sound insulation and sound deadening. I used it most anywhere I could..... rear deck/hatch; doors; side panels; entire floor under the carpet (the carpeting was a real pia to remove....I have never seen so much glue); front plastic inner fender wheelwell inserts (liquid only);under the hood. This process has not muted/eliminated the 968's desirable engine sound/music....but has really muted the road/tire noise/droan.

Craig[/quote]



"Sounds" (hehe) like you've found a good solution, if it quiets the infernal droning without muting the desirable sounds, though it sounds like a LOT of work to apply. As an alternative, more high tech solution, I wonder if it's possible to adapt electronic sound cancellation. I believe some OEMs (Acura in particular) are beginning to offer it in their new cars. If it's possible to add electronic traction control (a coworker of mine added it to his mid-nineties turbo M3 with phenomenal results), it should be possible to add sound cancellation to just drown out the low frequency rumbling, preserving the other sounds. Flash, being in the sound business, do you think this is this feasible? Thanks.

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[flash]

lol - i've been in a room that had that technology, and i got dizzy



i can't imagine it working too well in a car though - too many variables - the power consumption would be huge too - plus, the frequency that it would cancel would also be absent from the music



i'm afraid there's no free ride on this one

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[Cloud9...68]

Hmmm... But it's used on factory floors all the time to drown out the low frequency droning caused by machinery, and I know Acura is using it in the RL, and I believe the the cancelling "anti-sound" is played through the speakers. I think the biggest problem with something like this is the fact that there would be miniscule demand in the car modifying community for making a car quieter; most mods, of course, make the car louder, and most enthusiasts don't mind that. As with so many things in the tiny 968 universe, there probably isn't the demand to generate the volume to create something like this. Sigh...

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[flash]

i was only referring to the device, not the goop - the goop works fine for stopping material from resonating - it's a basic principle - add mass to a material, and the frequency at which that material vibrates drops - drop the frequency, and it requires more energy to vibrate it



the electronic method requires as much energy to cancel a frequency as to generate one - this means that the system needs a lot more power to generate the same amount of low end with the cancellation as it does without - the reason is that every tone generated in a system also gets a harmonic with it - when you cancel one frequency, you lose a lot more than that - also, the noises we try to cancel are in exactly the same places we try to accentuate in a system - you end up fighting yourself in a traditional system, and require a lot of tuning to get it right



to make this work, you need to have a series of "near feild monitors" this means a separate stereo set of speakers (including woofers) for each listening position in the car - you also need an active audio analyzing system that can adjust for the sounds in the cabin



the alternative is to add bass traps in the car - this will, however, also increase the power requirements of the system - it also requires a fair amount of cabin space to be effective



none of this is new thinking - recording studios use the same principles - it works very well - it is just new to cars



it does require a lot of speakers and a lot of amplifiers to make it work, but it can be done - just prepare to pay for it

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