[urq] Why are the L5 Turbo engine sounds different ?

[brady zq]

> -----Message d'origine-----
> De : John Cody Forbes [mailto:cody at 5000tq.com] 
> Envoyé : 10 février 2009 22:03
> À : Louis-Alain Richard; urq at audifans.com; quattro at audifans.com
> Objet : Re: Why are the L5 Turbo engine sounds different ?
> 
> Many many things have an effect on exhaust note. Little things like port 
> size and shape, header design, camshaft profiles, even combustion chamber 
> design, and big items like number of valves per cylinder, bore, stroke, 
> overall displacement, etc, all make the acousics change in various ways and 
> produce different sounds. Look at a V10 Carrera GT and a V10 Dodge Viper for
> a very extreme example... they just plain don't even sound like they are 
> from the same planet, but really they have a ton of simmilarities.


Well, aside from the fact the Carrera GT and Viper both 10 cylinder engines, I really don't think there is much in common between those two!

But the Audi 10 and 20V, on the other hand, share the same bore, stroke, displacement. Basically the only major difference is the head, yet they sound so different. To give an example, why does the 10V exhaust note seem to have almost individual pulses in its note, whereas that's not the case with the 20V?


> 
> Generally many people would say 'all V8s sound like a V8, all 6's sound like
> 
> 6's etc', but the truth is that that is only true to the untrained ear. I'd 
> guess that you couldn't tell the differance in engine note between a Porsche
> 
> 930 (3.3l) and a 3.2l Carrera, but I can tell you from half a mile away just
> 
> because I'm so used to hearing such things. Likewise while my P-car 
> loving/driving co-workers couldn't tell the differance in exhaust note 
> between my 5ktq and my friend's Volvo 5cyl S60R, your ear is accustomed to 
> the Audi engines and can pick out the very fine details of the note and to 
> you they sound as different as French and English. Heh, that leaves me 
> another good example - I'd bet that you can tell easily between someone born
> 
> in Quebec speaking French,  someone born in Paris, and someone born in 
> Haiti, but if you ask me it sounds like they are just all speaking French 
> and thats that ;-).


Right, and that's why we're asking Audifans, not cunning linguists, about Audis, not language accents. 


> 
> In my opinion you can't even group them as 10v and 20v sounds because simply
> 
> the best 5cyl Audi sound there is is right here:
> http://www.youtube.com/watch?v=hEK7POxpVeE
> 
> -Cody Forbes

Cheers,
Brady