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We down under have not been fortunate enough to drive a 300C in this country yet. Delivery is expected to be november. So what I would like to know is, how much road noise can you hear in the interior when driving with windows up? Has anyone gone the extra yard and made the car quieter and if so what product did you use and what areas did you apply it to? I have been in a few mercs and Lexus and find that is how quiet I would like my 300C to be.
Look forward to your replies

Dave
 

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Aussie 300C said:
We down under have not been fortunate enough to drive a 300C in this country yet. Delivery is expected to be november. So what I would like to know is, how much road noise can you hear in the interior when driving with windows up? Has anyone gone the extra yard and made the car quieter and if so what product did you use and what areas did you apply it to? I have been in a few mercs and Lexus and find that is how quiet I would like my 300C to be.
Look forward to your replies

Dave
Hi Dave, and welcome. And best of luck with the November delivery.

You're gonna absolutely love this car. It's by far the quietest vehicle I've owned. Normal conversation, even front to rear is no problem at 85 & 90 mph, just for a point of reference. DC designed this car from the ground up to be both solid and quiet. Lots & lots of sound deadening fillers used, even inside chassis components, for the express purpose of preventing/reducing harmonics.

And if you clever Aussies do come up with to make the car even quieter, please share it with us here on the forum...even quieter would be even better.
 

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I was surprised at how quiet the ride is! Nice indeed.
 

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Mine has no wind noise, no rattles, but those crappy continental tires make too much noise. The car is so fantastic it's a shame they put those tires on it; I've seen lots of posts here where people have changed them out for better ride and handling, but they are noisy too! My dad just got his 300C SRT8, with the goodyears (RS-A, not the F-1's) and even though they are far lower profile than the tires on my C , there's a LOT less tire noise in his SRT8. I can't throw the Conti's away right now but when it's time for new tires I'm getting Goodyears or Michelins. That's my ONLY complaint with this awesome car.
 

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The only 225/60 tires that fit the original size wheel are the Conti's. You know, those were the tires BMW put on the 540, and they didn't seem noisy on that car at all (they were 225/55 16). What pressures does the C call for?
 

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I did not fint the Contis noisy, they were harsh over sharp bumps, some of the bump harshness I think is due to shock or spring tuning or even high unsprung weight. New tires helped this tremendously, not really a noise issue.
 

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An aussie 300C will be a RHD. RHD are built in Austria (Magna Steyr plant) and won't get the US speed governor as well wich would be a nonsense(free speeding in Australian outback).

I'm sure you'll get an 155mph/250kph speed governor like euro spec and the Pirelli P7 tires 225/60 R18 (sommer).

With this setup @125mph/200kph you're able to listen to the radio (@10) and speak with passenger without an effort.
 

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LSV1970 said:
[email protected]/200kph you're able to listen to the radio (@10) and speak with passenger without an effort.
Now that, folks, is my kinda' car. :)
 
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