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Crap, my speedometer reads too high...

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Old 01-25-2008, 07:10 PM   #1
Qusus
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Default Crap, my speedometer reads too high...

So after driving the Mustang today I realized that I needed to go about 90mph to keep pace with the left lane. Now, I drove this road all the time and the flow of traffic was never ever 90mph. 85 tops, and that's rare. So I think... hmm maybe the speedometer is reading too high?

So I get my dad to take his car and do a cruise at 50mph and then at 80mph. At 50mph, the speedometer seems to be fine, but when he's doing 80 I need to go like 87-90 to keep pace. So apparently it only reads high at certain speeds?

Any of you guys have this problem before? Any way for me to fix this without taking it to the dealer. I dont mind taking it to the dealer as it's under warranty but I'd rather be able to do it myself. Also, do you think that the speedometer reading wrong also means that my odometer/mileage calculator etc is reading off as well?

I'm running a completey stock auto 06 GT btw.
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Old 01-25-2008, 07:17 PM   #2
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Default RE: Crap, my speedometer reads too high...

mine does this too.. im always driving 5mph slower than my spedo.. i have taken it to the stealership and they said that it is nothing to be concerned of and did nothing.
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Old 01-25-2008, 07:22 PM   #3
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Default RE: Crap, my speedometer reads too high...

Hmm they did nothing? That's not good service man. I'd tolerate a small difference but reading 90mph at 80 is way too much!
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Old 01-25-2008, 07:29 PM   #4
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Default RE: Crap, my speedometer reads too high...

Hmmm...That is strange on BOTH of u guys cars.

Do you have diff. tires? Gear ratio?
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Old 01-25-2008, 07:33 PM   #5
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Default RE: Crap, my speedometer reads too high...

ive got stock 18' bullits with the stock pirelli tires.. manual and i have 3.55 (2005)
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Old 01-25-2008, 07:37 PM   #6
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Default RE: Crap, my speedometer reads too high...

I got the stock 17's with the Pirelli's. Inflated to 32 psi. Standard gearing as well. It's more strange that it doesn't always read high like 50mph, just at much higher speeds.
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Old 01-25-2008, 07:40 PM   #7
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Default RE: Crap, my speedometer reads too high...

I'm not really to sure then. Anyone else know?
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Old 01-25-2008, 10:12 PM   #8
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Default RE: Crap, my speedometer reads too high...

No, but you want that fixed, cause if your speedo is to high then you are adding extra miles as well, so yes it is something to be concerned about!!!
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Old 01-25-2008, 10:15 PM   #9
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Default RE: Crap, my speedometer reads too high...

My speedo reads a few MPH higher than actual speed too, the bigger difference at higher speeds.
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Old 01-25-2008, 10:20 PM   #10
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Default RE: Crap, my speedometer reads too high...

You guys should just drive slower then.


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Old 01-25-2008, 10:44 PM   #11
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Default RE: Crap, my speedometer reads too high...

I have noticed pretty much the same thing with mine (stock tires @ 32psi). They always set up one of those "Your Speed Is" signs on the main road near my house, and my speedo was reading 40 when the sign was saying 35 - 36 mph. I used the revolutions per mile setting in the SCT 2 tuner and finally got it dead on @ 35mph and 40mph. There was a post a while back about a similar problem (forget which forum ) where the easier solution was to remove the needle from the speedo and put it back on slightly lower. I have not tried this method, but noticed my speedo is off again (after approx. 6 mos.) by about 2mph @ 35mph. I give up at this point and will be watching this post for any solutions.
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Old 01-26-2008, 12:17 AM   #12
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Default RE: Crap, my speedometer reads too high...

Alright, cool. Since the guy above is gonna watch this post I'm pretty much obligated to take it to the dealer now under warranty (haha).

I'll try to do it tomorrow and I'll keep everyone posted. I really don't want a speedo that reads 10mph too high at 80.
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Old 01-26-2008, 01:14 AM   #13
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Default RE: Crap, my speedometer reads too high...

There was actually something wrong with mine as I was reading 90ish MPH in 80-85. I took it to the stealership and they reset it.
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Old 01-26-2008, 01:34 AM   #14
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Default RE: Crap, my speedometer reads too high...

my reads 3 mph over all the time according to my gps
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Old 01-26-2008, 02:18 AM   #15
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Default RE: Crap, my speedometer reads too high...

go to ford and have them fix it!
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Old 01-26-2008, 03:45 AM   #16
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Default RE: Crap, my speedometer reads too high...

When I took mine in they just walk around the car with a little remote control device until your car honks then they send you on your way.[8D]
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Old 01-26-2008, 06:58 AM   #17
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Default RE: Crap, my speedometer reads too high...

Quote:
ORIGINAL: NELS GT

When I took mine in they just walk around the car with a little remote control device until your car honks then they send you on your way.[8D]
That's nice of them to unlock the doors for you.. haha
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Old 01-26-2008, 07:47 AM   #18
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Default RE: Crap, my speedometer reads too high...

Sounds like your cars ecmwas set up for 18" wheels. If so they should be able to fix at the dealer.
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Old 01-26-2008, 08:08 AM   #19
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Default RE: Crap, my speedometer reads too high...

My 2007 is off 5 mph too. No way to fix it. Its not a calibration error its an index error. IE it reads 45 mph at 40 mph and 80 mph at 75 mph. The face is off relative to the actual gauge.

The odometer actually reads 0.5% low as it is. If they calibrated the speedo at 75 mph it would be off everywhere else and the odometer would read 7% low.

I have tried several 3.55 geared 2007's and they all seem to be off 5 mph. (2500 rpm at 60 mph in 4th).
Both 2005's I have driven on the other hand only seem to be off 1 mph (2675-2700 rpm at 60 mph in 4th).
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Old 01-26-2008, 10:40 AM   #20
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Default RE: Crap, my speedometer reads too high...

at 60 mph my gps says my speed is about 3 mph off. the difference is worse the faster you go. this is pretty standard with most cars. my wife's cherokee is worse.

for all those guys that THINK they were going 150mph when they buried their speedo... not likely. probably at least 10mph off or more. which makes sense why a lot of them say it was "still pulling".

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ORIGINAL: alloutt

my reads 3 mph over all the time according to my gps
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Old 01-26-2008, 10:40 AM
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10, 2005, back, ford, high, miles, mustang, problem, reading, reads, revving, set, slow, speed, speedometer, wrong

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