3aXap

when car manufacturer measures the cars acceleration, do they measure it with some device that actualy states when car reaches THE REAL 100 km/h OR do they just record the time it reaches for the speed shown on dashboard to be 100.

I know for a fact dash doesnt display correct speed (it shows u lower speed then it actualy is), so I would assume manufacturers have different methods to record acceleration.

Can anyone educate me on the matter? thnx:thumbsup:

B6T

They probably use GPS. I know the speedometer in one of my cars lagged behind what the actual speed was. Most fast cars with cable driven speedometers are probably that way.

judgez24

most speedos will become off the faster you go. my car is pretty close, my truck is off a few kph over hiway speeds. but yeah as fred said, gps is what they use for it all

NOTORIOUS VR

Bars don't use cables anymore for speedos.... they haven't for a long time.

AMKK

0-100kph??? My car's speedo is pretty decent aslong as I have traction.


Boost owns...

3aXap

well 0-60 miles to put it other way. I dont think they use GPS cause i dont think its 100% accurate theres still some error

AMKK

I'm pretty sure they take an average of the runs. That's what Road&Track Magazine does anyways.

gldwngr

They use a fifth-wheel mounted to the side of the car, or the optical equivalent of same, all hooked up to recording electronics inside the car.

jdmh22

iTrader: (1)

depends on the company

Young gun

they use gps and average of a few runs well most do

Leung

iTrader: (2)

try using the Gtech pro device or whatever its called

gldwngr

And your industry source for this is?

skillton

Most of the speedometers read higher than the actual speed of the car. I used to do emission tests and the dynos are calibrated to read the exact speed, most cars showed anywhere from 2-10km/h more @ 40km/h, very few were dead on, and almost none read lower. The worst was a Porsche boxter which was showing 50-51km/h @ 40km/h.
I doubt any manufacturer tests their cars based on the speedo