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Old 08-04-2003, 07:09 PM   #1
Scooby Newbie
Member#: 38705
Join Date: Jun 2003
Chapter/Region: NWIC
Location: Portland, Oregon
'95 GM2 Rally Car
& '08 WRX

Unhappy my trip reads 10.3 miles for every 10 miles traveled!

My tires are stock 15", it's a '97 Impreza L Sedan, what are some possible problems? I doubt tire pressure would cause this much of a problem but I'll be checking that tonight!
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Old 08-04-2003, 07:16 PM   #2
Scooby Newbie
Member#: 39921
Join Date: Jul 2003
Location: Good will Huntington
'00 RS Sedan


mine does the same thing, 104 mi. for every 100 mi. Sure adds up but the dealership put me off til it was out of warrenty and now I don't have any kind of recourse. Oh well, guess I won't be selling it any time soon. Anyone know how to fix this? Or disconnect the ODO entirely?
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Old 08-04-2003, 08:58 PM   #3
Scooby Specialist
Member#: 12863
Join Date: Nov 2001
Chapter/Region: MWSOC
2002 2.5RS


how could this physically happen and not be a problem with the odo itself?

Also how do you know it is reading off if you still have the stock sized tires on there?
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Old 08-04-2003, 09:26 PM   #4
Scooby Newbie
Member#: 33067
Join Date: Feb 2003
Chapter/Region: MWSOC
Location: MI
1998 Legacy Wagon
Spruce Pearl


I would assume he is using mile markers

I think that tires of the same designated size would have enough variation in circumference, especially with wear, to cause this problem. If you really want accuracy, you have to tweak the vehicle speed sensor's signal with an aftermarket unit.
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Old 08-05-2003, 02:42 AM   #5
Scooby Guru
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
'01 GC8 Dinged STM
'09 Concours 14 ABS Black


FYI you are allowed a 10% inaccuracy in the odo/speedo, my reccomendation, get used to it, running on bald tires will make your ODO read higher in the long run.

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Old 08-05-2003, 10:17 AM   #6
Scooby Specialist
Member#: 5796
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Moonshineville
2013 BRZ & 2004


get a guage cluster out of a junker w/less mileage.........i mean

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Old 08-05-2003, 11:03 AM   #7
Scooby Specialist
Member#: 34670
Join Date: Mar 2003
Chapter/Region: South East
2013 No gears!
Saltine American


Just your trip, or does the odo read wrong too?
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Old 08-05-2003, 11:12 AM   #8
Scooby Newbie
Member#: 27958
Join Date: Oct 2002
Location: East SFBay, CA
2004 WRX Wagon
WR Blue


3% off isn't very unusual. My Jetta (probably all Jettas) is 5-6% off, my Toyota was about 4% off.

Smaller tires read more miles/faster speed than you are really going, larger tires read less (because you cover the same distance with less turns of the wheel). You could use a tire size calculator to figure out a size of tire that's larger and would read 3% fewer miles.

Tire Size Calculator
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