2005 - 2014 MustangsDiscussions on the latest S197 model Mustangs from Ford.
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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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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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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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