Prius C Speedometer offset/error

Are you asking if the speedometer is off (too fast)?

If so then keep in mind that nearly all cars exhibit this error. It is by design due to national laws in most cases. The GenII and GenIII Prius also exhibit this error. The GenII reads 2mph too fast and the GenIII is 1.5-2mph too fast when compared to GPS and Scangauge.

 

I just go 70, it saves time!
I get passed quite often!

 

I can't speak specifically to the c or those delivered to Singapore, but http://priuschat.com/forums/gen-iii...ometer-error-about-1-mph-some-evidence-2.html might prove insightful.

 

The odometer reads correctly as does the internal computer. The manufacture designs the speedometer to read high to avoid lawsuits with people speeding because of speedometer errors. If you hook up a Scanguage or other device that reads the car computer you will find it to agree with GPS data.

 

It depends. The speedo inaccuracy is not necessarily the same amount or even direction as the odo inaccuracy. 10% error is a lot though...

http://www.caranddriver.com/var/ezf...lication/1e1b33f85f31df61e4830f32f82a5a71.pdf accompanied the very old article at Speedometer Scandal! - Feature - Car and Driver.

 

A 10% speedometer error is a serious design flaw IMO. My car's speedometer is 100% accurate with new tires.

 

First of all, I am happy to get to know another fellow prius c owner in SG..
The local SC is really nothing to offer us.. They did not even have the correct grade of engine oil for prius c (did you check what they put in during your first service?) ...

The speed display is confirmed to be about 10% off as compared to Scangauge2.. When is your next service? I have about 2500KM more to go before my next one is due... Do keep us posted

 

Singapore and the US speedometer regulations are different.
EU, Singapore, JP and others follow UN/ECE Regulation No.39.

The Singapore's 10% error is within the regulation.

Ken@Japan

 

Use your GPS to check this too. As noted earlier, speedometer and odometer errors are not the same, and speedometer regulations are different in different markets. I haven't heard anything about non-U.S. odometer regulations, but U.S. civil law has placed expensive consequences on manufacturers for odometers that read even 2% too high.

 

sorry for the off-topic discussion ...

I presume you also have the 5 year service free from the dealer, right? Then why should you bring the 0W20? The oil should be included!! You should scold them badly and force them to bring in the right oil... This is what I did and this is what I will be doing during my next servicing...

PS: What color is your ride, mine is Black

 

Same bad experience at SC and after wave of complains I still do not see any improvement... think we should get in touch to see this through together with the SC.. two voice together is always better then one..

As for the swirl mark on black car, I have 2 black cars before this... and not much of a problem for me, probably because I do my own washing and grooming... Anyway, dig Lime Pearl White... Was considering this or grey if black mica was not available... Very unique color

Anyway :focus:... The speed difference was not an issue to me until I install a speed activated auto door lock... That was suppose to lock at 20Km/h but only start to work on mine at 25Km/h... It sort of trouble me during installation as I wanna make sure it works..

 

I put 14's on my CRX, which was set up for 13's. The correction factor was 1.06046. Six percent was 2.5-3 mph at 60 mph.

The speed was corroborated by my GPS unit and a radar sign on the highway.

My truck is spot on. My Camaro is spot on. Daughter's truck is spot on. I don't think it's all that common to have a vehicle off very much.

That being said, I think the new C is maybe 1 mph off between the speedo and the radar sign. Too soon to have studied it very much.