Speedometer Correction

Speedometer Correction

Author
Discussion

ben_reza

412 posts

146 months

Friday 8th May 2009
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Pints said:
It's out because your car is st and you're a crap driver wink
Just about to suggest that is a bit harsh, then I checked who the OP is....

King Herald

23,501 posts

180 months

Friday 8th May 2009
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Pyro said:
OP i've often wondered this myself and im suprised it isn't part of a major service, i guess thats due to it not being easy to do/fix maybe...
Because putting cars on a rolling road and calibrating the speedo costs a lot of man hours/money, unless it is an adjustable electronic speedo.

I had an after market electronic speedo in my last hot rod, and I set it dead on, to a GPS system. It is surprising how slow most people go through speed cameras when running off of factory speedometers......

Pyro

99 posts

145 months

Friday 8th May 2009
quotequote all
King Herald said:
Pyro said:
OP i've often wondered this myself and im suprised it isn't part of a major service, i guess thats due to it not being easy to do/fix maybe...
Because putting cars on a rolling road and calibrating the speedo costs a lot of man hours/money, unless it is an adjustable electronic speedo.

I had an after market electronic speedo in my last hot rod, and I set it dead on, to a GPS system. It is surprising how slow most people go through speed cameras when running off of factory speedometers......
Yes that was my thoughts too, its a shame they cant think of a better more cost effective way of keeping them calibrated.. supposed electronics the way to go.. i'd still want knightrider style red led readings, none of this fancy green lit lcd

GTSjohn

85 posts

57 months

Wednesday 2nd December 2020
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OK - wonder if a quick thread bumb can help me.............Just bought a Cayenne S diesel, and the speedo reads 8% fast. Swopped an Audi A8 for it, which read 2% over. 2% I can live with as a safety net, but 8% is ridiculous.....Yes, I can look at my Snooper, but as it moves between cars it won't always be present, and I'd rather have an accurate speedo for setting the cruise and doing trip computer calculations.

So, the (I thought, wrongly!) simple question I've spent the last 2 hours searching for an answer to is this - can a modern digital speedo (2017 car) be adjusted by a main agent, or do I have to go rogue and fit a "yellow box", which I suspect would rule out getting an OPC warranty?

All helpful comments appreciated.

Thanks


Pope

2,455 posts

211 months

Wednesday 30th December 2020
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Weirdly Cayenne can have a software glitch (resolved by reprogramming) where cruise doesn't match chosen speed - but not sure you really meant to post on this thread?!