Speedo errors?

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Apr 18, 2011 | 03:41 AM

#26

JimR56JCW

3rd Gear

iTrader: (1)

Joined: Oct 2009

Posts: 213

Likes: 0

From: Beaufort, SC

Quote:

Originally Posted by kmethchu

Well.....I'm glad I did a search today. I've only had my R56 for a week and I replaced the 16" wheels/tires with 17". Today I put my GPS in the car for a small road trip and notice the speedometer was reading 4 mph faster. I thought it might be because of the wheel swap, but I guess not!

Chuck

If you went from 195/55/16 to 205/45/17, it is close to the same diameter. I just did a tire size calculator on these two and the 16 was 24.4 in. the 17 was 24.3 in. The 17, being slightly shorter will actually add to the speedo error. A taller tire will bring it towards zero error.

Apr 18, 2011 | 06:04 AM

#27

zeiker

2nd Gear

Joined: Feb 2011

Posts: 89

Likes: 0

From: Southeast Tennessee

Quote:

Originally Posted by Btwyx

They arrange it so the Speedo reads fast, but the Odo is spot on. So the warranty really is 50,000 miles.

Not my experience (2011 S Clubman). With GPS over ~50 mile stretches, odometer counts off miles faster than gps and mile markers.

Apr 18, 2011 | 10:20 AM

#28

OPC

RATTUS Deserticus

Joined: May 2008

Posts: 1,579

Likes: 0

From: Chandler, AZ; aka Lesser Phoenix, aka BFE

Quote:

Originally Posted by mbu

I'll check that out but it seems very unlikely..

What's their "excuse" for not having the fuel gauge accurate? I know the tank is convoluted but in this day and age they could physically determine the volume at depth increments of perhaps 1/8" and have a microprocessor use those findings to show the volume in the tank. Microprocessors are very inexpensive nowadays - less that $0.50 for one that will do this job!

The fuel gauge may not be linear, but I've found it to be fairly accurate.

Apr 18, 2011 | 10:33 AM

#29

Fly'n Brick

6th Gear

Joined: Oct 2008

Posts: 4,964

Likes: 393

From: In the here and now, for now.

Been driving for over 50 years and I have yet to see a vehicle of any kind including Cessnas that doesn't seem burn the gas off the bottom half faster than the top half. That's just the way they are, get used to it.

Nov 27, 2012 | 05:12 PM

#30

mosherrskl

2nd Gear

Joined: Jul 2012

Posts: 55

Likes: 0

From: Syracuse, NY

My 2013 reads about 5% high compared to my GPS (stock 15" tires). This is really annoying. In this age of electric speedos (vs cable) there is no excuse for this. My 2000 Audi is DEAD ON.