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Old 09-23-2013, 01:29 PM   #13 (permalink)
Vekke
Mechanical engineer
 
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Join Date: Jan 2009
Location: Kitee (Finland)
Posts: 1,272

Siitin - '98 Seat Cordoba Vario
90 day: 58.56 mpg (US)

VW Lupo 3L --> 2L - '00 VolksWagen Lupo 3L
Diesel
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)

A2 1.4 LPG - '02 Audi A2 1.4 (75hp)
90 day: 24.67 mpg (US)
Thanks: 270
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Project is officially started .



Weight of those 15" wheels 5.8 kg per piece.

Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com

Rough calculations of the project first with only diesel powertrain.
On lupo 3l you can reach 3 liters at 100 km/h speed with 1.2 TDI.
Lupo weights 950 kg with driver and A8 target weight 1500 kg = 36,7% difference in weight every 10% increase is 2-4% on highway --> max 14,7% higher fuel consumption
Lupo 3l CdA 0,29*2,0=0,58 Audi A8 modded 0,23*2,2=0,506 = A8 is 12,7% better so 12,7% less fuel consumption on highway speeds

That means I should try to keep the gear ratios pretty close to same as in my Lupo 3l gearbox. That is one reason behind that I will first test 195/65R15 tires. Other is weight savings and ofcourse the frontal area gets smaller.
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Vesa Tiainen innovation engineer and automotive enthusiast
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