SPEEDO READING TOO FAST.2.0 HDI

[codgod]

HI FOLKS,MY SPEEDO IS READING TOO FASY ON MY HDI 110 ANYBODY KNOW WHAT THE PROBLEM COULD BE THANKS STEVE.

[boombang]

What size tyres are you running, are they at correct pressure and what are you validating speed against?

[codgod]

car is totally original.ive had car for 4 years and i can tell its running about 8mph too fast.

[Busman]

car is totally original.ive had car for 4 years and i can tell its running about 8mph too fast.

Most speedos aren't very accurate. I would suspect you have been checking it against a sat nav? You'll probabley find the error gets greater as the speed increases. I recon mine over reads by about 5% give or take. So 70 on the sat nav is about 74 or 75 on the speedo. Like all car gauges, they are not accurate to any remotely scientific degree.

[gumby6371]

I changed my standard wheels for 16" alloys and my speedo now over reads by 2 to 3% according to both my sat navs.
If the car is completely standard 8 mph at 70 = 78 mph which takes you just over the legal limit of 70 +/- 10% so I'd get it checked or drive accordingly.

I'm assuming you mean it's over reading by a percentage to give you 8 mph over read at a given speed not a constant 8mph over where you're doing 8mph standing still.

Not being overly familiar with the new-fandangled HDI engines possibly a BSI reset may recalibrate the speedo - any other members care to comment?

[Doggy]

It will work from the vehicle speed sensor in the gearbox - effectively, it measures the speed of the drive shafts.