my trip reads 10.3 miles for every 10 miles traveled!

Kyguy · 08-04-2003, 07:09 PM

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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mprezuhguy · 08-04-2003, 07:16 PM

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?

mike270 · 08-04-2003, 08:58 PM

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?

ws6fiero · 08-04-2003, 09:26 PM

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.

HndaTch627 · 08-05-2003, 02:42 AM

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.

jeremy

mcu81 · 08-05-2003, 10:17 AM

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

-mike

orndog · 08-05-2003, 11:03 AM

Just your trip, or does the odo read wrong too?

bclee · 08-05-2003, 11:12 AM

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

08-04-2003, 07:09 PM	#1
Kyguy Scooby Newbie Member#: 38705 Join Date: Jun 2003 Chapter/Region: NWIC Location: Portland, Oregon Vehicle: '95 GM2 Rally Car & '08 WRX	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! * Registered users of the site do not see these ads.

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08-04-2003, 07:16 PM	#2
mprezuhguy Scooby Newbie Member#: 39921 Join Date: Jul 2003 Location: Good will Huntington Vehicle: '00 RS Sedan STM	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?

08-04-2003, 08:58 PM	#3
mike270 Scooby Specialist Member#: 12863 Join Date: Nov 2001 Chapter/Region: MWSOC Vehicle: 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?

08-04-2003, 09:26 PM	#4
ws6fiero Scooby Newbie Member#: 33067 Join Date: Feb 2003 Chapter/Region: MWSOC Location: MI Vehicle: 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.

08-05-2003, 02:42 AM	#5
HndaTch627 Scooby Guru Member#: 6551 Join Date: May 2001 Chapter/Region: MWSOC Location: Carol Stream, IL Vehicle: '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. jeremy

08-05-2003, 10:17 AM	#6
mcu81 Scooby Specialist Member#: 5796 Join Date: Apr 2001 Chapter/Region: MWSOC Location: Motown Dub V Vehicle: 2007 11 F150, 2004 WRX-dont get married!	get a guage cluster out of a junker w/less mileage.........i mean -mike

08-05-2003, 11:03 AM	#7
orndog Scooby Specialist Member#: 34670 Join Date: Mar 2003 Chapter/Region: South East Location: Atlanta Vehicle: If she smokes she pokes	Just your trip, or does the odo read wrong too?

08-05-2003, 11:12 AM	#8
bclee Scooby Newbie Member#: 27958 Join Date: Oct 2002 Location: East SFBay, CA Vehicle: 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