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MY07 speedo inaccuracy

PostPosted: Thu Oct 11, 2007 9:36 pm
by OzSTi
I've long suspected my speedo over reads but just this week I've had the opportunity to check my speedo against a GPS.

Assuming GPS is accurate (can anyone comment?), at an indicated 60km/h, the GPS says I'm doing 53km/h.

This corelates with my subjective observations and shows it is more than 10% out.

Has anyone else got the same problem?

PostPosted: Thu Oct 11, 2007 9:59 pm
by viriix
Yep!!!!

If i'm at 80km/h on speedo, i'm doing about 73km/h on gps
If i'm at 90km/h on speedo, im doing about 81km/h on gps

110km/h on speedo shows as 100km/h on gps

I think my reading is very similar to yours for 60km/h on speedo as well..

PostPosted: Thu Oct 11, 2007 10:03 pm
by gt_dicko
Pretty common for the libs to read under...
http://forum.liberty.asn.au/viewtopic.php?t=564

PostPosted: Thu Oct 11, 2007 10:47 pm
by OzSTi
viriix wrote:Yep!!!!

If i'm at 80km/h on speedo, i'm doing about 73km/h on gps
If i'm at 90km/h on speedo, im doing about 81km/h on gps

110km/h on speedo shows as 100km/h on gps

I think my reading is very similar to yours for 60km/h on speedo as well..


Is this the Subaru optional GPS?

I'm going to speak to Subaru and consider this a warrantee issue. My previous two Subies were fine and out current Kluger is spot on and I think a greater than 10% discrepancy is unacceptable.

PostPosted: Fri Oct 12, 2007 12:53 am
by MY07GT
Yeah i always thought so cuz everytime i slow down for a camera and do the exact speed limit, i wonder why people are still passing me when im doing the exact limit?

Let us know how you go Oz.

Phil.

PostPosted: Fri Oct 12, 2007 7:40 am
by tangcla
MY07GT wrote:Yeah i always thought so cuz everytime i slow down for a camera and do the exact speed limit, i wonder why people are still passing me when im doing the exact limit?
Your car is just slow... literally ;)

It's common for cars to read under the speed limit. There's a 10% manufacturer's tolerance.

PostPosted: Fri Oct 12, 2007 7:51 am
by viriix
OzSTi wrote:Is this the Subaru optional GPS?


No, I use a TomTom Go710! and I've also had a RoadAngel earlier..

I know there are innacuracies.. and then I also know the speed cameras in NSW allow for more.. discrepencies lol..

So.. you'd really have to be going fast to get a ticket.. which.. well isn't hard :p

The Liberty has a greater variance than any car i've driven and tested with a GPS of some sort.

My Honda Euro was roughly 3-5km/h out and the later Holdens were pretty spot on the dot!

Let us know what Subie says about it...

PostPosted: Fri Oct 12, 2007 9:52 am
by EJ25
no matter how inaccurate they are, im still going 89k's through a 90 fixed speed camera.. my license is my life.lol

PostPosted: Fri Oct 12, 2007 9:55 am
by sinist4
EJ25D wrote:no matter how inaccurate they are, im still going 89k's through a 90 fixed speed camera.. my license is my life.lol


yeah ive kinda noticed wen im doing 60 km/h it feels so slow compared to the other cars. i suspected the speedo was kinda faulty. :evil:

PostPosted: Fri Oct 12, 2007 2:49 pm
by sleepergtb
You will notice that the test on the new WRX is the same. Approx 93 km/h at 100km/h

PostPosted: Fri Oct 12, 2007 3:33 pm
by Resonate
EJ25D wrote:yeah ive kinda noticed wen im doing 60 km/h it feels so slow compared to the other cars. i suspected the speedo was kinda faulty. :evil:


Haha yeah same here! The other day i was going down this stretch of road hitting 60km/h exactly on my speedo because there was a cop next to me and all the cars in front were speeding off into the distance and i started laughing thinking at least one will get pulled over, but instead even the cop flew off.

PostPosted: Fri Oct 12, 2007 10:50 pm
by Boxer
Yep tested mine when I first got it as I suspected the same - felt slower than the speedo indicated. My GPS (Garmin ETrex Legend handheld) revealed around 10% inaccuracy

PostPosted: Sat Oct 13, 2007 8:20 am
by Bobolicious
Yep, mines the same.
I've got 17" wheels on mine, I thought some of you guys with 18's would be closer??
Looks like I may have to go for 20's to fix it up!!!