Rep Power: 766

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:

 
Rep Power: 807

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.

 
Rep Power: 804

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

 
Rep Power: 800

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

 
Rep Power: 787

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


Boost owns...

 
Rep Power: 766

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

 
Rep Power: 787

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

 
Rep Power: 772

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.

 
Rep Power: 706

depends on the company

 
Rep Power: 0

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

 
Rep Power: 0

try using the Gtech pro device or whatever its called

 
Rep Power: 772

And your industry source for this is?

 
Rep Power: 786

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