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https://www.drive.com.au/news/ho ... edo-20140716-ztmh4/
How accurate is your speedo?
16 July 2014
A five-month test has revealed that nearly all vehicles, from base model sedans through to supercars, don’t read the right speed.
An exclusive Drive test has shown 93 per cent of new car speedometers are inaccurate.
A five-month study of 60 new vehicles ranging in price from $14,490 to $441,300 showed most speedos measured over the posted limit by an average of 5km/h at 100km/h – well within the Australian Design Rule parameters.
The difference in readings - as much as 6 per cent at 100km/h - can partially explain the difference in driving speeds on some freeways.
It's particularly noticeable on heavily policed sections of road, where tailgating can be rife as frustrated drivers either urge others to speed up or are afraid to inch over what their vehicle's speedometer is displaying.
The Drive test was undertaken using a satellite phone app on the same flat stretch of road, with the device mounted securely in a cradle. Sitting on 100km/h with the cruise control activated, testers monitored the true speed of the app over a period of about 60 seconds, comparing it with a vehicle’s indicated speed. The app reading was then compared to an industry-certified GPS performance meter, to ensure absolute accuracy.
Of the 60 vehicles tested, four – three Jeep Cherokees and an Audi A5 2.0 TFSI - came back with a perfect 100km/h reading, while a Mahindra Genio ute was next best with a 99km/h reading.
The worst culprits for inaccuracy were the Nissan Juke, Toyota Kluger, Alfa Romeo MiTo and Jeep Wrangler (all 6km/h off). To-date, the most inaccurate reading obtained by Drive was in a Nissan Patrol, which was out by 11km/h.
As a general rule, luxury cars fared better in the testing than regular passenger cars – usually within 2km/h of the true speed.
All cars fell within the parameters of an Australian Design Rule that requires that the speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount of more than 10 per cent plus 4km/h.
That is, with the speedo displaying 100km/h the vehicle must be travelling between 87.3km/h and 100km/h. This gives the perception that drivers are travelling faster than what they really are - or exactly at the limit.
The test was performed on near-new tyres and on vehicles with fewer than 10,000km on the odometer.
The biggest fluctuations in speed readings usually come from tyre wear, pressure and tread depth, as well as calibration of the speedo.
The difference between a new and worn set of tyres usually equates to about 3km/h at 100km/h, as the car will actually be travelling slightly slower for the same reading on worn tyres.
Car Actual speed at 100km/h
Mazda3 GT 25 98
Toyota Corolla Ascent sedan manual 95
Honda Odyssey VTi-L 96
Subaru WRX (pre production model) 96
BMW 220i Coupe 98
Mercedes-Benz CLA200 98
Kia Soul 96
Hyundai iLoad 95
Nissan Juke 94
Toyota Corolla ZR auto sedan 95
Range Rover Evoque Coupe pure SD4 auto 96
Audi RSQ3 98
Mazda3 SP5 Astina 97
Audi A5 2.0TFSI 100
Volvo XC60 T5 98
Toyota Kluger 94
Volvo S60 Polestar 98
Volkswagen Golf GTI 98
Toyota Kluger 4x4 95
Volvo V40 97
BMW X5 25i sDrive 98
Subaru WRX STI 98
Porsche Cayenne S diesel 97
Toyota Kluger GXL AWD 96
Volvo XC60 D4 96
Volkswagen Golf Wagon 90TSI Comfortline 95
Range Rover Evoque coupe 95
Hyundai Elantra 98
Volkswagen Golf Wagon 110TDI Highline 96
Kia Cerato S 96
Skoda Octavia RS wagon 95
Toyota Corolla sedan 96
Holden Cruze 97
Mitsubishi Outlander PHEV 95
Nissan X-Trail ST-L 2WD 95
Porsche 911 Turbo 98
Audi TT 2.0TFSI quattro 98
Dodge Journey 98
Subaru BRZ 97
Porsche Panamera Turbo S 98
Jaguar XJR 95
Volkswagen Golf GTI 96
Holden SS Commodore 97
Toyota 86 96
Skoda Octavia RS sedan 95
BMW X1 96
Mini Cooper 96
Alfa Romeo Mito 94
Hyundai Accent 97
Honda City 97
Jeep Wrangler 94
Renault Clio GT 97
Jeep Cherokee Trailhawk 100
Jeep Cherokee Limited 100
BMW M4 98
Jeep Cherokee Longitude V6 100
Mini Cooper S 98
Mitsubishi mirage sedan 98
Range Rover LWB 5.0 SC 94
Mahindra Genio 99 |
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【136mydream】自驾房车环游澳洲一年 (2008-10-18) 136mydream 
我的买店过程 （更新- 尘埃落定 226# 04/02/2016） (2010-9-30) Davina 
楼主:landlordunion
发表于 2022-1-16 01:37
