41 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHIntentionally Inaccurate speedometer
Leading reported evidence
Check already
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Leading evidence: 'Check already' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'only time ford ever did anything right' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check already' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suspected cause
It was probably the only time Ford ever did anything right.
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Suggestion
OR, (for you slow people) if your speedo lied and said 100 MPH but you were actually doing 1MPH, your odometer wouldn't care, and it would still change from mile to next mile in exactly every mile you drove.
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Suggestion
You can also see this (in kph) using the HVAC controller's data display.
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Suggestion
OR, (for you slow people) if your speedo lied and said 100 MPH but you were actually doing 1MPH, your odometer wouldn't care, and it would still change from mile to next mile in exactly every mile you drove.
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Discovered something interesting yesterday..let me know if this is old news. According to my GPS my 996 speedo, digital & analog are showing 4 to 5 mph higher than it really is. Interestingly, this is exactly the same amout that BMW's read high. Now here's the interesting part. If I hook up my Autoenginuity software to the OBDII port, it shows the CORRECT speed reported to the DME!. So When my rear spoiler goes up at 75mph per the speedo, the DME knows damn well it's really 71mph. Anyone else able to verify the same thing? Does Porsche (and BMW) really think that we can't handle the REAL speed? I had always thought that the higher reading was built in so that variations in production would never yield a speedo that reads lower than actual...but apparanty, that's not the case!
AHHH, that only took 4 minutes!!! What the hell are we all doing on our PC's at 9:30 on a Sat night...we're all a bunch of losers......oh, wait...that's right..I mean married... I guess it is exactly as I originally assumed, intentional for legal reasons ( I wonder why the US makers have no problem getting it right though...) the accurate odometer point is what I over looked, of course. They would HAVE to know what it really is, or else they could be reporting 10% or more mileage than was really being racked up..thanks, guys.
I think you are almost right--I had heard that in Germany, the speedometer had to be either right on or read lower than actual, so the statistical approach is to make them all read low. Mine reads 2 MPH lower than actual.
On the bright side, probably reduces the number of tickets we all get a little. . .
Yup, that's my philosophy.
I know that I can do 72mph in PA before they'll pull me over, so that translates into 77mph on the speedo.
Additionally, I know that they'll haul my *** off to jail for 78mph, so I'm really good until 83mph.
man, I just went through 3 speed traps in upstate NY averaging 90+, just managed to see them in time. Plus, no front plate for laser. What would I get, the death penalty?
bloody troopers just not busy enough.
I would rather not have to do arithmetic when I see a trap and glance at the speedo.
Yeah, tell me about it. The roads are busy, there are lots of cops and they love to enforce the speed limits.
Off of the freeways there are so many traffics lights (in my area) that on some days I'm lucky if I can make it into 4th gear before I hit another red.... it's downright depressing.... I may as well move back to the Bay Area, as it's getting just as bad as there.
My town has speeding cameras. You are allowed to go over by 10 mph but at 11 you get a ticket sent to you.
I set the cruise at 11 over the speed limit and got the citation in the mail that indicated that I was going exactly 11 over.
I guess mine is accurate.
Amazing! It was probably the only time Ford ever did anything right.
I refuse to buy one of their POS cars again. I see that you have more tolerance for their poor build quality and design than I do.
Personally, I believe that the manufacture places the indicated speed higher than the actual speed to help the vehicle's warranty expire faster. Think about it...You drive 20 "actual" miles to work and back. According to the speedo, you've just driven 22 "indicated."
Rotor sends...
I used to think that, and I haven't tested my odometer to prove otherwise. BUT... The speed signal to my datalogger (CAN bus, the same signal that is used to generate the one shown on the cluster) is generally within 1/2 mph of GPS speed, and quite a bit off the cluster display. You can also see this (in kph) using the HVAC controller's data display.
Yep, I believe it was Honda that got in alot of trouble for that very thing. I think Porsche is most likely doing same thing but limits the range to 5mph or else all of us would get on their case too....
i thought the DME was reading accurate speed, but the display was high? Is the odometer keyed off the DME or of the digital speedo readout I guess is the question.
I would be PISSED if Porsche was swindling me on warranty.
HAH! You guys crack me up!!! The miles on the odometer have nothing to do with your MPH guage!!
It's a time matter. In other words, if your speedo is 5 MPH over, that means if you drove 25 miles and your speed read 25 MPH (but you were actually doing 20 MPH) you'd get there in over 60 minutes (72 min I think). Get it?
OR, (for you slow people) if your speedo lied and said 100 MPH but you were actually doing 1MPH, your odometer wouldn't care, and it would still change from mile to next mile in exactly every mile you drove. K, done!!
That's not necessarily true. The odometer is based on the speed signal. The question is, is the odometer based on the signal the DME sees (accurate) or the signal the cluster sees (not so much). I think a test is in order.
Ya, you can all rest assured, the odometer is VERY accurate and depends on nothing else. Especially an inaccurate reading of the speedometer. With todays GPS devices and hell, just mile markers. Even the slightest innacuracy would be very easy to figure out. In all the years on the earth, i've never even heard of an inaccurate odometer.
neither had I until reading this thread actually, but I just did a quick google and found:
http://www.cbsnews.com/stories/2007/...e=search_story
http://www.eagerodometers.com/general.html
If you have shorter tires on a car than the factory specs, the odometer will think the car has traveled further than it actually has. The speedometer will also read higher.
<shrug> He happens to be correct, and that's ignoring the fact that Porsche's legal department would most likely freak if they thought the engineers had the odometer being driven by the speedometer.
As gant says, there's little to no correlation between the odometer and the speedometer.
Mechanical speedo days, there was a direct correlation. Just to be clear, chainging the height of the tire or swapping gear ratios will affect the speedo and odometer similarly.
Sure, but we're not talking about the mechanical speedo days. You didn't forget your 996 already, did you?
Sure, but I think you're just confusing the issue by pointing this stuff out.
Both the speedo and the odometer get their numbers from the abs wheel speed sensors. That seems pretty tightly linked to me. After that, it's just math.
