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Weird issue!

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dust

dust

Golden Member
So I got recently a brand new Yaris from my company and everything's all right about it apart from driving comfort, I'm really happy with the consumption and the ac (it gets pretty hot here in the UAE).

The second day after I got it I had to take my own car home also and I let my wife drive the Yaris while I was driving my own car. I live about 100 kms from the city, so I drive usually with 120km/h. I'm soon getting a call from my wife telling me to slow down as she was at 130 km/h and raising as she kept the car steady behind mine. I looked at the speed and it was at 110-115km/h only!!

At 100km/h in the Yaris the real speed is actually 90, at 120km/h is actually 105 and as I raise the speed the difference seems to increase little bit as well. At 80 and below it seems to be all right.

I had to service it already at 1000 kms and I asked about the issue, however the engineer there said this was impossible to be as these things are standard and so on.

I noticed the same thing with two Hyundai Getz, my wife had from her company before, the difference was at a steady 10 km/h only. At the time I thought there was something wrong with my own car (328/95) as it was old and not always properly maintained, but I also checked it against my wife's Aveo and the Getz was still indicating 10 kph higher.

Has anyone noticed anything similar before? I'd really want to have an answer to this.
 
It's probably got bigger tires than its calibrated for, dealer should know this. If it is not new/warranty, any transmission shop should be able to fix/calibrate.
 
lurk3r said:
It's probably got bigger tires than its calibrated for, dealer should know this. If it is not new/warranty, any transmission shop should be able to fix/calibrate.
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Negative! 😉 14 inches wheels here, the car is pretty standard, but yeah I'll try to get it done at the next service.

Thanks guys!
 
Drivenbyvoltage said:
Negative! 😉 14 inches wheels here, the car is pretty standard, but yeah I'll try to get it done at the next service.

Thanks guys!
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The rims are 14", the numbers on your tires are the height/width ratio, and if they change the size of your tires change original equipment was either 175/65-14 or 185/60-15 so check your tires for the 175/64, since you know you have the 14's
 
after getting a ScanGauge I realized that mine is off too, mostly after 115-120kph. If my speedometer reads 130kph, the ScanGauge tells me I'm going around 122kph. Not really a big deal, kinda explains why I never get any speeding tickets 😛
 
In Europe at least, manufacturers are subject to fines if the speedometer reads lower than the car's actual speed, so most are calibrated to err slightly high, usually by a percentage. It may be similar in UAE.

ZV
 
lurk3r said:
It's probably got bigger tires than its calibrated for, dealer should know this. If it is not new/warranty, any transmission shop should be able to fix/calibrate.
Click to expand...

it would be smaller tires, not bigger. i have 265 on my truck that came stock with 225s, and my speedo reads 60 when im doing 66. for it to read 66 when youre doing 60 id think it would have to have smaller tires.
 
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