A2Steve
A2OC Donor
Came across a good bit of information today. Fuel efficiency is a big factor in many people buying an A2 TDI and so the folloiwng information may be interesting. It shows what items make up the A2's drag and the effect that modifications can have in both a positive and negative context.
Parts Percentage of Total Drag
Cooling package (including radiator, intercooler, oil cooler, etc) 33.4%
Exterior 31.7%
Front wheels 13.1%
Rear wheels 6.9%
Floor 6.9%
Rear Axle 3.1%
Engine 3.1%
Front Suspension 1.4%
Exhaust 0.7%
Modification % Change
Lowering the vehicle by 30mm approx. -5
Smooth wheel covers -1 to -3
Wide tires +2 to +4
Windows flush with exterior approx. -1
Sealing body gaps -2 to -5
Underbody panels -1 to -7
Concealed headlamps +3 to +10
Outside rearview mirrors +2 to +5
Airflow into the engine compartment +4 to +14
Brake cooling devices +2 to +5
Interior ventilation approx. +1
Open windows approx. +5
Open sunroof approx. +2
Roof-mounted rack approx. +40
Parts Percentage of Total Drag
Cooling package (including radiator, intercooler, oil cooler, etc) 33.4%
Exterior 31.7%
Front wheels 13.1%
Rear wheels 6.9%
Floor 6.9%
Rear Axle 3.1%
Engine 3.1%
Front Suspension 1.4%
Exhaust 0.7%
Modification % Change
Lowering the vehicle by 30mm approx. -5
Smooth wheel covers -1 to -3
Wide tires +2 to +4
Windows flush with exterior approx. -1
Sealing body gaps -2 to -5
Underbody panels -1 to -7
Concealed headlamps +3 to +10
Outside rearview mirrors +2 to +5
Airflow into the engine compartment +4 to +14
Brake cooling devices +2 to +5
Interior ventilation approx. +1
Open windows approx. +5
Open sunroof approx. +2
Roof-mounted rack approx. +40