ivan Posted September 4, 2005 Share Posted September 4, 2005 When I checked my speedo reading against my RoadAngel (Mk 1) the speedo seems to be about 10% out. Eg. it says 55, RA says 50 and the error increases as the speed goes up... I double-checked against my TomTom and that gives the same reading as the RoadAngel, so the GPS reading seems to be true. Is it possible to adjust anything to take out the error? I'm not too bothered, as with it reading high at least I'll be more inclined to be going too slow past the cameras rather than too fast. Oh, the wheels are 17" Toyota due to upgrading to UK brakes. Cheers for any help, Ken Quote Link to comment Share on other sites More sharing options...
Steve W Posted September 4, 2005 Share Posted September 4, 2005 ALL road car speedos are OPTIMISTIC ! ! And the Soop is fairly bad ! Yep i reckon about 10% is right 55 = 50, 150 = 135/140, that's about right ! ! IF you've got one of the ADJUSTABLE speedo convertors then YES you can bring the Optimism down (can't remember the limit of correction ) Different rolling diameter wheels/tyres also raise lower the Speedo (BIGGER/TALLER profile means CLOSER to true speed) however, altering it THAT way is a bit costly (?!) and you have to alter them a FAIR BIT to get anywhere. [obviously you can alter SPEEDO MARKS... but again, a bit messy ??] FatS. Quote Link to comment Share on other sites More sharing options...
michael Posted September 4, 2005 Share Posted September 4, 2005 This is normal, it just means that you can drive faster now that you know Quote Link to comment Share on other sites More sharing options...
TLicense Posted September 4, 2005 Share Posted September 4, 2005 You can buy a yellow box speed convertor. You can adjust the signal from the speedo -10% to +18% and use it to convert KPH to MPH. you can find them at http://www.blackrobotics.com Quote Link to comment Share on other sites More sharing options...
SupraStar 3000 Posted September 4, 2005 Share Posted September 4, 2005 WOW! Thats great Do you have one fitted Tony? Quote Link to comment Share on other sites More sharing options...
ivan Posted September 4, 2005 Author Share Posted September 4, 2005 Nice find Tony - thanks. I may just invest in one of those. $110 doesn't seem too bad. Now, whare's that darn speed sensor... Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted September 5, 2005 Share Posted September 5, 2005 anyone try those speed signs at side of some road.they tell you what speed you dioing.in escort doing 40 on sign it reads 45 on speedo in car Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 5, 2005 Share Posted September 5, 2005 As a cheap fix, you can remove the needle from the speedo, then travel up a private test track at around 80-90 measured by GPS, then re-fit the needle. All speedos over-read as I believe it's illegal for them to under-read, so manufactures like to take a safe option. Quote Link to comment Share on other sites More sharing options...
ivan Posted September 5, 2005 Author Share Posted September 5, 2005 I agree Matt - but 10% is being a bit too safe. Quote Link to comment Share on other sites More sharing options...
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