Page 732 - Automotive Engineering Powertrain Chassis System and Vehicle Body

Exterior noise: Assessment and control C HAPTER 22.1

Table 22.1-2 The ten lowest homologation levels in the UK

Manufacturer Model Description Trans. Capacity Fuel dBA
Daihatsu Terios 1.3L Efi 4WD A4 1298 Petrol 65
Daihatsu YRV 1.3L Efi turbo A4 1298 Petrol 66

Renault Vel Satis 2.0 Turbo A5 1998 Petrol 66.7
Mitsubishi Carisma 1.6 Mirage A4 1597 Petrol 67
Smart Cabrio Hatchback Cabrio & Passion A6 599 Petrol 67
Nissan Primera 2.0 4/5 door M6 1998 Petrol 67
Mitsubishi Galant – sedan 2.5 Elegance A4 2498 Petrol 67

Nissan Primera 2.0 Estate A6 1998 Petrol 67
Nissan Primera 2.0 4/5 door A6 1998 Petrol 67
Mitsubishi Galant – wagon 2.5 Elegance A4 2498 Petrol 67

Source: www.vca.gov.uk. Accessed in November 2003.

like). Tables 22.1-2 and 22.1-3 give an indication of suggested noise targets for each noise source are given in
this. Note that most of the ten lowest homologation Table 22.1-4.
levels shown are for automatic cars and most of the It should be noted that due advantage is taken in Table
highest homologation levels are recorded for sports- 22.1-4 of the 1 dBA reduction in reported values due to
utility vehicles with large engines and manual potential inaccuracy of the noise homologation test.
transmissions.
It should be appreciated that the total wayside noise
level during the acceleration test is made up of contri- 22.1.2 Noise source ranking
butions from many noise sources (engine, intake, ex-
haust, tyres, etc.). Noise levels from each of these must When a vehicle manufacturer is having difficulty ho-
be controlled in order to achieve type approval. Some mologating a vehicle for noise, it is important to know the

Table 22.1-3 The ten highest homologation levels in the UK

Manufacturer Model Description Trans. Capacity Fuel dBA
Chrysler Jeep Grand Cherokee 4.7L Overland A5 4701 Petrol 76
Vauxhall Frontera 3.2I V6 24v A4 3165 Petrol 76
Mitsubishi Colt 1.3 Attivo 2 M5 1300 Petrol 76

Volkswagen Touareg 2.5 M6 2461 Diesel 76
Mitsubishi Shogun 3.2 Equippe LWB M5 3200 Diesel 76
Land Rover Discovery 2.5 TD5 A4 2495 Diesel 76
BMW X5 X5 3.0d M6 2993 Diesel 76

Land Rover Defender Wagon 2.5 TD5 90 M5 2495 Diesel 76
Land Rover Discovery 2.5 TD5 M5 2495 Diesel 76
BMW X5 X5 3.0I M6 2979 Petrol 76

Source: www.vca.gov.uk. Accessed in November 2003.

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