 Weird speedometer issues |
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 Jan 20, 2008 - 8:43 AM
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Enthusiast  Joined Dec 16, '07 From College Station, TX Currently Offline Reputation: 0 (0%)  |
Hey guys, i recently got a GPS unit for my celi and I've noticed that the speed the GPS says I'm traveling at does not match my speedometer readout. Basically, the speedometer is always overshooting my actual speed - for example, when the speedometer reads 80mph, the GPS says i'm traveling at 72mph, speedo: 70- GPS: 63, speedo 55 - GPS 50. It's not the GPS unit getting a bad reading - I did the same test in another car and it read the same as the other car's speedo. Weird thing is, it's not just off by some systematic amount - it's a ratio thing somewhere. Any ideas??
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Jan 20, 2008 - 8:50 AM
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 Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
do you have aftermarket rims + tires?
they can throw your speedo out a few MPH. -------------------- Former Team 5SFTE pro member ;)
 13.6@108MPH, 5SFTE Powered |
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Jan 20, 2008 - 9:11 AM
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 Enthusiast Joined Oct 28, '07 From epworth uk Currently Offline Reputation: 3 (100%) |
speedos in car are usually slightly under but larger rims will increase this depending on tyre size but gps will be spot on i used my gps to set my speedo back up when i replaced dials hth
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Jan 20, 2008 - 9:51 AM
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Enthusiast Joined Dec 16, '07 From College Station, TX Currently Offline Reputation: 0 (0%) |
Nope, i just have the stock 15's... It's just strange that the speedo would be off by THAT much. There has to be a fix for it somehow
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Jan 20, 2008 - 10:24 AM
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Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
QUOTE(aggieanton @ Jan 20, 2008 - 9:51 AM) [snapback]632560[/snapback] Nope, i just have the stock 15's... It's just strange that the speedo would be off by THAT much. There has to be a fix for it somehow what size are the tires? -------------------- Former Team 5SFTE pro member ;)
13.6@108MPH, 5SFTE Powered |
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Jan 21, 2008 - 10:50 AM
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 Enthusiast Joined Dec 19, '07 From tx Currently Offline Reputation: 22 (100%) |
It's also very hilly in and near college station - can GPS account for that? If you look at the numbers he's posting it would seem to make a certain amount of sense. He's going 80MPH but down hill and the GPS can only "see" him from a nearly vertical position so it "see's" 72MPH. Does that make sense to anyone else?
Just an idea. --------------------  ENGINE: '93 RC 3S-GTE/WRC CT-20b [18-20PSI] PERF: TRD/HKS/ARP/NGK/MSD/ACT/Blitz/STRI/APEX'i/TwosRus/GReddy/Magnaflo/KOYO SUSP: Tein/Bilstein/SusTech/ INT: SS-III SEATS/Toyota Hyper Sports EXT: WRC/TRD/404 QUOTE (lagos @ Aug 25, 2010 - 10:13 AM)  Its a safety feature so that people like you don't end up killing themselves or everyone around them. Slow down Paul Walker. 6GC Chat - Go there: [url="http://www.griffgirl.com/forum/chat/index.php[/url] |
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Jan 21, 2008 - 6:44 PM
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Enthusiast Joined Jul 28, '06 From Delaware Currently Offline Reputation: 0 (0%) |
QUOTE(DEATH @ Jan 21, 2008 - 10:50 AM) [snapback]632880[/snapback] It's also very hilly in and near college station - can GPS account for that? If you look at the numbers he's posting it would seem to make a certain amount of sense. He's going 80MPH but down hill and the GPS can only "see" him from a nearly vertical position so it "see's" 72MPH. Does that make sense to anyone else? Just an idea. It adjusts for that. |
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Jan 22, 2008 - 1:02 AM
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 Enthusiast Joined Jun 30, '06 From West Windsor NJ, USA Currently Offline Reputation: 14 (94%) |
GPS lags...
--------------------  --------------------------------私は銀行に漂う,TRD Inspired |
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