speedometer variance
After reading this thread earlier today I installed GPS Essentials on my phone and compared the GPS reading with both cars. The Boxster is consistently 3mph over the GPS reading; while my Impreza is in the range of 1-2 mph over the GPS. So I guess I can set the cruise slightly higher when driving at police officer friendly speeds.
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I just thought it was a "Porsche" thing from the google searches I've done |
Speedomeeter error
I get similar results comparing GPS with 2002S. Speedo is consitently +3 mph fast.
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Did the same on the way to work this morning. My speedo is jacked. There is no place to open it up, but I had to do 39-40 on the speedo to get a consistent 35 reading on my GPS. And had to do a solid 50 mph to get 45 on my GPS. No wonder I haven't been pulled since I bought this car 10 months ago.
Gonna' try and run I-94 around 10:00am (hopefully I won't have to dodge much traffic) and see if I'm off by a constant or a percentage. P.S. Any fixes for this other than altering my tire size? I know back in the day, with my Chevys I could get a different plastic speedo gear to adjust for this, but I'm just beginning to become familar with the Porsches. |
With 18" Porsche wheels and Michelin Pilot Sports my 2003 S speedo is +2 mph at 70-80mph compared to gps.
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By the way, some have mentioned the error as a percentage. Mine seems to be a fixed 3mph, whether I'm travelling 36 or 86mph.
And that's on OEM 18s with Pilot Sports or PZeros. |
The easiest way to correct this is to switch to higher aspect ratio (series) tires, But I rather stick to stock size tires because your speed reads slower on radar gun. ;)
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+4 MPH at all speeds. matched it to a roadside radar sign and a scan tool with live data.
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My speedo reads +2-3mph.
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