speeddometer crazy

[s13_Angelo]

my speeddometer is not reading right it reads 10 miles more, like it show that I'm doing 90 but I'm doing 80 what can cause this ?and I confirm this cause me and my friend were driving I'm both cars and he told me he was doing 70 and mine was showing 90

[slider2828]

Wheel diameter.. and usually there is about 5-8 mile too high discrepancy on these older cars. Its just how it is. Also gear ratio...

[wangan_cruiser]

im running 14 inches wheel and my speedo runs like 90mph but it doesnt feel like it.

[Rnz520]

Its just because things go off as they get old, mine is about 4 miles off so just conpensate with your driving. If you must find out exactly how fast you are going or see how much you are off get a gps and compare :)

[wangan_cruiser]

yea you can do that too just to monitor how fast you are going.

[a_ahmed]

which GPS would you guys recommend to get accurate speed reading. I need one too...

[Rnz520]

hmm, most of the are accurate, Ive used a Garmin and another kind and both gave me the same readings. Now if you actually need a good gps Garmins are excellent, and I hear the TOM TOMS are good too, especially for their price.

[HS13KLS]

^^

everyone i know loves the tomtom..but dont go with off name brand things...ehh...do i need to explain?
ha

[a_ahmed]

yea now a days they have gotten quite cheap too. I care about accuracy mostly...

Aside from gps/map browsing/whatever, a gps based speedo would be cool lol... only speed, is there such a thing built on the cheap? So one can adjust their speedo...

[HS13KLS]

maybe im just dumb...but could you re phrase that?..i just didnt understand it :/

[a_ahmed]

1. GPS are cheap now a days to get
2. What I would be interested in is something super cheap JUST for speed readings through GPS; so I can use it for getting accurate speed reading + have the ability to adjust a non accurate analog/digital/whatever car speedo.

[s13_Angelo]

so there's no way to fix this , I been using my gps and it doesn't show the speed that my speedo says