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Old 01-05-2015, 02:24 PM   #8 (permalink)
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Join Date: Jan 2009
Location: Kitee (Finland)
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Siitin - '98 Seat Cordoba Vario
90 day: 58.56 mpg (US)

VW Lupo 3L --> 2L - '00 VolksWagen Lupo 3L
90 day: 104.94 mpg (US)

A8 luxury fuel sipper - '97 Audi A8 1.2 TDI 6 speed manual
90 day: 64.64 mpg (US)

Audi A4B6 Avant Niistäjä - '02 Audi A4b6 1.9tdi 96kW 3L
90 day: 54.57 mpg (US)

Tourekki - '04 VW Touareg 2.5TDI R5 6 speed manual
90 day: 32.98 mpg (US)

A2 1.4TDI - '03 Audi A2 1.4 TDI
90 day: 45.68 mpg (US)
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Originally Posted by Focus-Ak View Post
Or another way to look it is that the engine is now over-sized. So if there were more time and $ for the project, a re-engining may be productive both in improving engine efficiency and in reducing weight. (Which in turn means a slightly smaller engine is needed, which means less weight, which means ... which is why aircraft design, for example, is an iterative process).

Interesting curves and data points. Thanks for posting this.
- Yes you can recalculate the gear ratios to match Cd drop
- Add more weigth do match Cd drop
- Downsize the engine to match Cd drop

From those options the gear ratios are easiest to play with. However I would say the 1.2 TDI is perfectly sized for this A8 project.
Less drag = Less fuel
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