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Car Forum / Jeep / August 2007Correcting speedo error
A GPS is as accurate at calculating your vehicle speed as is a 'certified' speedo in a police car. So when the speedometer in my 2006 Liberty was registering 107 kph when the GPS was showing 120 kph, I mentioned this at my next service interval. The mechanic came up with a relatively easy fix. He re-programmed the computer to make it think I had different sized tires on the car. He got it dead on. However, the odometer still registers less kilometers than the GPS records. I have verified the GPS odometer with the markers along the highway. Can anyone confirm that electronically altering the speedometer reading would not necessarily change the odometer as well? Thanks > A GPS is as accurate at calculating your vehicle speed as is a 'certified' > speedo in a police car. So when the speedometer in my 2006 Liberty was [quoted text clipped - 15 lines] > > Thanks Of course it would alter the odometer too, it's part of the speedometer. Maybe it would be a better idea to find the real problem. >> A GPS is as accurate at calculating your vehicle speed as is a 'certified' >> speedo in a police car. So when the speedometer in my 2006 Liberty was [quoted text clipped - 17 lines] > > Of course it would alter the odometer too And that would be illegal no? Steve >>> A GPS is as accurate at calculating your vehicle speed as is a >>> 'certified' [quoted text clipped - 22 lines] > > Steve Why? You want the odo to be 'real' miles. My CJ7 with 33" tires has an odo gear to make them match the speedometer exactly in 'real' miles. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) >>> A GPS is as accurate at calculating your vehicle speed as is a >>> 'certified' [quoted text clipped - 22 lines] > > Steve No. It's never been illegal to correct your speedometer. tw >>Steve wrote: >> [quoted text clipped - 33 lines] >> >>tw Illegal to alter the odometer reading though. I even pulled the needle off the speedometer on my old Cherokee to re-adjust the speed to match a radar gun that was being operated in the passenger seat by a police officer. Since I got my Liberty CRD a year ago, I have kept track of every drop of fuel put in the tank. I use K-Jon Vehicle Record System that calculates among many other things, my KPL, or kilometers per litre. I then take that figure & go to http://www.onlineconversion.com/fuel_consumption.htm where I convert it to miles per gallon (UK) which is the same as 'old guys' used to use in Canada. It was only after I drove back to the Michigan NASCAR race on Tuesday that it came to light that I HAD to be getting better fuel economy than VRS indicated. I drove round trip 588 km and still had 1/4 tank left when we got back to London. This was according to the vehicle odometer. However, the GPS said we drove 658 km. I have since checked known distances and the GPS is dead nuts. The vehicle odometer is approx. 12% off, for talk-sake. Of course, that means that I will theoretically be able to drive 12% further before my warranty runs out! However, I think I'll mention this at my 30K maint. visit. If they think it warrants fixing, then let them find the solution. If they are content with the current situation, then so be it. For the record, my KPL on that trip was 9.79, or 11.0 if bumped 12%. That converts to 23 mpg / 25.9 mpg US. - OR- 27.7 / 31 mpg Canadian. I don't think that's too bad for driving 65-70 mph for the most part. >>>Steve wrote: >>> [quoted text clipped - 58 lines] > converts to 23 mpg / 25.9 mpg US. - OR- 27.7 / 31 mpg Canadian. I don't think > that's too bad for driving 65-70 mph for the most part. Now, it's never been illegal to correct your odometer readings if they are incorrect. Rolling back odometers is another matter, but if you have the experimentation and documentation that would hold up in a court case, I'm sure you'd be fine, but then, there really would be no need to roll it back, anyway. The manufacturers generally put the error on the side of showing more miles than you've actually driven, claiming it's impossible to get a "dead nuts" as you put it...or "balls on", etc. reading. However, it most certainly IS possible but the auto manufacturers probably save millions in cutting your warranty 5, 8, 10-12% short. Look for inaccurate odometers even in vehicles equipped with GPS systems. Since your situation is the opposite of the usual problem and since now your speedo is correct, I'm not sure that most people would jump through hoops or even mention it. I'd like to buy your used vehicles, though! tw budman@frozenorth.ca proclaimed: >>>Steve wrote: >>> [quoted text clipped - 37 lines] > speedometer on my old Cherokee to re-adjust the speed to match a radar gun that > was being operated in the passenger seat by a police officer. Misunderstanding. Correcting your speedometer/odometer to either more accurately or even less accurately isn't in any way shape or form illegal. It is only if you alter the odometer reading to indicate a lower mileage than accumulated. Grey areas possible in somve venues if you intentionally alter the speedometer/odometer to accumulate waaay less mileage than is being done. Further grey area if after having observed an odometer that is overly accumulating you alter it backwards to indicate the actual mileage--in some instances lawsuit level grey area if it causes your warranty to expire early and you are using stock tires and running gear. Dunno if anyone has collected on one of those lawsuits, but they have been filed where there appears to be a pattern of readings in the wrong direction. >>budman@frozenorth.ca proclaimed: >>>>> [quoted text clipped - 52 lines] >>lawsuits, but they have been filed where there appears to be a pattern >>of readings in the wrong direction. Actually, that's what I was infering, 'rolling' back the odometer is a no-no. I remember long,long ago....... Almost every used vehicle taken in on trade at a dealership where I worked had "special" instructions on the work order. Every vehicle had a common problem... "Repair rattle in dash". That was before "Nudge nudge, wink wink" was even heard of. :) That would be odd, but there 'could' be two different calibrations in the computer program. I doubt anyone here has a factory manual for a Liberty to tell you for sure. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > A GPS is as accurate at calculating your vehicle speed as is a 'certified' > speedo in a police car. So when the speedometer in my 2006 Liberty was [quoted text clipped - 9 lines] > > Thanks budman wrote: Looks at subject, pictures Borat in a green thong/speedo. Pokes eyes with pen. > A GPS is as accurate at calculating your vehicle speed as is a > 'certified' speedo in a police car. So when the speedometer in my [quoted text clipped - 8 lines] > Can anyone confirm that electronically altering the speedometer > reading would not necessarily change the odometer as well? Depends on what got reprogrammed. Sometimes there are different offset values for the spedometer and odometer, both need to be changed. I don't have the manual for your Jeeps computer, so I can't tell you if it has two locations.  SignatureDougW >>budman wrote: >> [quoted text clipped - 18 lines] >>I don't have the manual for your Jeeps computer, so I can't tell you if >>it has two locations. Thanks for that Doug. I'll mention that when it goes in for service next. |
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