Why is S car fuel mileage so poor?

[S Dewitt]

Oh and the S cars have a lower gear ratio..

Scott DeWitt
Advanced Automotion
817-939-6761
----- Original Message ----- 
From: "S Dewitt" <sdewitt at stx.rr.com>
To: <quattro at audifans.com>
Sent: Saturday, September 25, 2004 4:25 PM
Subject: Re: Why is S car fuel mileage so poor?


> You have to make power somehow... More fuel + more air =  more hp..
> The S cars probably run a richer mixture to combat detonation...
>
> Scott DeWitt
> Advanced Automotion
> 817-939-6761
> ----- Original Message ----- 
> From: "Enzeder" <enzeder at comcast.net>
> To: <quattro at audifans.com>
> Sent: Saturday, September 25, 2004 9:16 AM
> Subject: Why is S car fuel mileage so poor?
>
>
> Why are the S cars mileage numbers so low?  I figured consumption would be
> a matter of engine load and efficiency.  As both engines are pulling the
> same weight (and shape in the case of the S8), the load should be roughly
> similar.  So does that make the S cars 15% engines less efficient?
>
> Take the S8 for example.  Two naturally aspirated V8's of the same
> displacement and hauling the same weight.  Looking at highway numbers (as
> it's fairly steady state):
> S8 vs A8 (both 2001)
> 21 vs 24 mpg
> 4024 vs 4068 lbs
> 360 vs 310 HP
> 317 vs 302 ft/lbs
> 11.0 vs 10.8 comp ratio
> 13.9 vs 14.2 ¼ mile
> 6.3 vs 6.7 0-60 mph
> An aside: 345x30mm vs 312x25mm (323x30mm for the A8L)
>
>
> As for the S6:
> S6 vs A6 4.2 (both 2002)
> 21 vs 25 mpg
> 4024 vs 4024 lbs (surprised by this)
> 340 vs 300 HP
> 310 vs 295 ft/lbs
> 11.0 vs 11.0 comp ratio
> 14.5 vs 15.0 ¼ mile (14.7 for the 2.7tt w/6-speed)
> 6.5 vs 6.7 0-60 mph (6.0 for the 2.7tt w/6-speed)
> Curiously, both have 321x30mm front rotors.  I expected the S6's to be
> bigger.
>
> Numbers taken from the AudiWorld site.
>
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