Scion Xd Tire Size - Toyota Nation Forum : Toyota Car and Truck Forums


» Auto Insurance
» Featured Product
Advertisement
Wheel & Tire Center

Go Back   Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Division and International Models Forums > Scion Forum > xD Forum

xD Forum Discussion area specifically for the Scion xD

ToyotaNation.com is the premier Toyota Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 10-20-2009, 05:58 PM   #1 (permalink)
New TN User
 
Join Date: Oct 2009
Location: Waxahachie, TX
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View hachieroger's Photo Gallery
Scion Xd Tire Size

Just got new tires for the Xd and discovered that the factory size of 195/60/16 is somewhat of an oddball size currently. I put 205/60/16 on it and the gas mileage is down quite a bit. Wondering if I can get the computer recalibrated for the taller tires?

Any ideas?

Roger
hachieroger is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 10-21-2009, 11:28 AM   #2 (permalink)
Let me out of my cage....
 
HATEnFATE's Avatar
 
Join Date: Jan 2006
Location: My Cage......
Posts: 1,658
Gameroom cash: $243650
Thanks: 85
Thanked 59 Times in 54 Posts
Lifetime Supreme Member
iTrader Score: 0 reviews
View HATEnFATE's Photo Gallery
As much as I hate to say it. It's not something I know anyone doing. I'm sure someone out there could figure it out but as far as i know, Toyota ECU's are pretty hard to crack.

You really should only be off by maybe 1 mph around 70. The diff in your speedo should be neglegable.
__________________
"Fools", said I, "You do not know, silence like a cancer grows.
Hear my words that I might teach you. Take my arms that I might reach you"
But my words, like silent raindrops fell, and echoed, in the wells of silence.....

Jason Johnston
Toyota/Scion of Des Moines
(800)342-7045
HATEnFATE is offline   Reply With Quote Quick reply to this message
Old 11-22-2009, 10:02 AM   #3 (permalink)
New TN User
 
Join Date: Oct 2008
Location: Houston
Posts: 22
Thanks: 1
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View hswaters's Photo Gallery
Are you calculating the mpg yourself or taking numbers from the car computer itself? The car computer will not calculate an accurate number if the tire size is changed. This does not mean you are getting more or less mpg. I for one intend to change to a more reasonably priced tire size when I need new tires. I can see that a size that only changes about one mph at 65 is available from several manufacturers.
hswaters is offline   Reply With Quote Quick reply to this message
Old 03-18-2010, 03:23 PM   #4 (permalink)
New TN User
 
Join Date: Aug 2008
Location: hawaii
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
View bobolinko's Photo Gallery
ctually....

Quote:
Originally Posted by HATEnFATE View Post
As much as I hate to say it. It's not something I know anyone doing. I'm sure someone out there could figure it out but as far as i know, Toyota ECU's are pretty hard to crack.

You really should only be off by maybe 1 mph around 70. The diff in your speedo should be neglegable.

The difference is:

When speedometer reads 60mph (96.6km/h) actual speed will be 57.4mph (92.4km/h): 4.3% slower.
bobolinko is offline   Reply With Quote Quick reply to this message
Old 04-25-2010, 04:35 PM   #5 (permalink)
New TN User
 
Join Date: Apr 2010
Location: ILLINOIS
Posts: 5
Thanks: 2
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View spokybob's Photo Gallery
Really?

Quote:
Originally Posted by bobolinko View Post
The difference is:

When speedometer reads 60mph (96.6km/h) actual speed will be 57.4mph (92.4km/h): 4.3% slower.
I'm thinking you have it backwards. The new tires are slightly taller so each revolution makes the car go farther. And if you go farther, you must be going faster.
spokybob is offline   Reply With Quote Quick reply to this message
Old 04-26-2010, 12:38 PM   #6 (permalink)
New TN User
 
Join Date: Aug 2008
Location: hawaii
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
View bobolinko's Photo Gallery
Quote:
Originally Posted by spokybob View Post
I'm thinking you have it backwards. The new tires are slightly taller so each revolution makes the car go farther. And if you go farther, you must be going faster.
Dude, the speedometer is in a direct relationship with tire revolutions.
Therefore a bigger tire rotates less times in the same distance as a small tire would. That would make the speedometer register less, since the bigger tires are turning less for the same given distance traveled. However, it's a free country and you can "think" however you want, right or wrong, it's your choice.
bobolinko is offline   Reply With Quote Quick reply to this message
Old 04-26-2010, 04:55 PM   #7 (permalink)
New TN User
 
Join Date: Apr 2010
Location: ILLINOIS
Posts: 5
Thanks: 2
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View spokybob's Photo Gallery
Quote:
Originally Posted by bobolinko View Post
The difference is:

When speedometer reads 60mph (96.6km/h) actual speed will be 57.4mph (92.4km/h): 4.3% slower.
...
...
Quote:
Originally Posted by bobolinko View Post
That would make the speedometer register less
Which is it?

Last edited by spokybob; 04-26-2010 at 05:01 PM.
spokybob is offline   Reply With Quote Quick reply to this message
Old 04-26-2010, 05:18 PM   #8 (permalink)
Let me out of my cage....
 
HATEnFATE's Avatar
 
Join Date: Jan 2006
Location: My Cage......
Posts: 1,658
Gameroom cash: $243650
Thanks: 85
Thanked 59 Times in 54 Posts
Lifetime Supreme Member
iTrader Score: 0 reviews
View HATEnFATE's Photo Gallery
Ok.....compared to stock......

If you put on a taller tire(larger circumference) you're actually going faster then what you're speedometer says.

If you put a smaller tire(smaller circumference) then you're actually going slower then your speedometer says you're going.
__________________
"Fools", said I, "You do not know, silence like a cancer grows.
Hear my words that I might teach you. Take my arms that I might reach you"
But my words, like silent raindrops fell, and echoed, in the wells of silence.....

Jason Johnston
Toyota/Scion of Des Moines
(800)342-7045
HATEnFATE is offline   Reply With Quote Quick reply to this message
The Following User Says Thank You to HATEnFATE For This Useful Post:
spokybob (04-26-2010)
Old 04-26-2010, 05:20 PM   #9 (permalink)
New TN User
 
Join Date: Apr 2010
Location: ILLINOIS
Posts: 5
Thanks: 2
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View spokybob's Photo Gallery
I agree
spokybob is offline   Reply With Quote Quick reply to this message
Old 04-27-2010, 02:52 AM   #10 (permalink)
New TN User
 
Join Date: Aug 2008
Location: hawaii
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
View bobolinko's Photo Gallery
Quote:
Originally Posted by spokybob View Post
...
...
Which is it?
Dude,
You're absolutely correct. I used a wrong tire size in the calculations, it was for someone else in my office at the time, and got the two transposed. The correct calculation (as you suspected) is:

When speedometer reads 60mph (96.6km/h) actual speed will be 61.1mph (98.4km/h): 1.8% faster

Thanks for pointing that out... I had to go back to read what I posted when you said the above quote.
bobolinko is offline   Reply With Quote Quick reply to this message
Old 03-25-2012, 09:17 PM   #11 (permalink)
New TN User
 
Join Date: Mar 2012
Location: 25813
Posts: 1
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
View jlea05's Photo Gallery
Thumbs up Thank you!

As a math teacher who drives a Scion, this thread just literally made my day. I love the step-by-step explanations of the concepts and how the problem is worked out in detail. I also love that there was a mistake, it was OK, and it was corrected. My middle-school students think making a mistake is the end of the world. It's OK to make mistakes! That's how we learn! I'm thinking about using this in a lesson. Thank you!
jlea05 is offline   Reply With Quote Quick reply to this message
The Following User Says Thank You to jlea05 For This Useful Post:
HATEnFATE (03-27-2012)
Old 04-10-2012, 07:16 PM   #12 (permalink)
Official TN Member
 
vic benson's Avatar
 
Join Date: Jun 2010
Location: Ontario, Canada
Posts: 182
Gameroom cash: $155800
Thanks: 0
Thanked 9 Times in 9 Posts
iTrader Score: 0 reviews
View vic benson's Photo Gallery
If you want to be sure of your speed without having to make calculations while driving.

Plug in your GPS and it will tell you how fast you are going iregardless of tire size.
vic benson is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

  Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Division and International Models Forums > Scion Forum > xD Forum

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Toyota Nation Forum : Toyota Car and Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 05:09 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.