Gear ratio question... - Suzuki Forums: Suzuki Forum Site
Suzuki Forum Suzuki Forums

» Auto Insurance
» Featured Product
Wheel & Tire Center

Go Back   Suzuki Forums: Suzuki Forum Site > Suzuki Models > Suzuki Jimny, Sierra & Samurai Forum
Register Home Forum Active Topics Photo Gallery Garage Search Today's Posts Mark Forums Read Auto EscrowAuto LoansInsurance Advertise

Suzuki-Forums.com is the premier Suzuki All Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 05-25-2011, 07:44 PM   #1 (permalink)
Member
 
sohcneondriver's Avatar
 
Join Date: Jan 2011
Posts: 69
Gallery: 0
sohcneondriver is on a distinguished road
Garage
Default Gear ratio question...

I just realized the other day that something is funny with my gearing. Until recently, I knew I had bigger than stock tires, and by using my GPS I knew my speedometer was off by about 20%. Fine.

Problem is, I was going to check my gas mileage the other day, and it hit me- its 20% in the wrong direction! Unless I'm thinking about this the wrong way, with bigger tires you should be going faster than your speedo says, but for me when the speedo reads 60 I'm only going 50. And I have 31" tires which I'm guessing is about a 10% increase from stock, so that makes me think I have about a 30% gear reduction somewhere... does this sound right?
sohcneondriver is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-26-2011, 11:00 AM   #2 (permalink)
Senior
 
zooki4x4's Avatar
 
Join Date: Aug 2009
Location: Laurel Fork, VA
Posts: 150
Gallery: 0
zooki4x4 is on a distinguished road
Default

Your thinking right. Taller tires should make you read slower than your actually going. Going from a stock 205-70-15 (26.3") tire to a 31" tire should put you near 18% off. Either someone has done A, A t-case upgrade B, A ring gear swap. C, Your speedo is just way off. D. A combo of all the above. Your running at nearly a 40% reduction by the speedo readings.
zooki4x4 is offline   Reply With Quote Quick reply to this message
Old 05-26-2011, 08:44 PM   #3 (permalink)
Senior
 
Join Date: Mar 2009
Location: 2Close2LA
Posts: 193
Gallery: 8
Merlin93 is on a distinguished road
Default

The speedometer drive comes from the output of the transfer case. Changes to the transfer case gearing will not affect the speedometer/odometer reading. Is it possible you have a 5.13 (Sidekick) or 5.38 (Yukon) Ring & Pinion installed?
Merlin93 is offline   Reply With Quote Quick reply to this message
 
Old 05-27-2011, 09:11 AM   #4 (permalink)
Senior
 
zooki4x4's Avatar
 
Join Date: Aug 2009
Location: Laurel Fork, VA
Posts: 150
Gallery: 0
zooki4x4 is on a distinguished road
Default

With the T-case gearing this is true it won't change the speedo reading. The best I can tell they offered two differant speedo gears for the end of the cable. One was a 19 tooth and another with 20 depending on year. Around a 10% change.
zooki4x4 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

  Suzuki Forums: Suzuki Forum Site > Suzuki Models > Suzuki Jimny, Sierra & Samurai Forum

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Suzuki Forums: Suzuki Forum Site forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
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:
Insurance
Please select your insurance company (Optional)

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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 v3.2.3

All times are GMT -5. The time now is 03:32 AM.



Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.