gear ration calculaotr? - Hot Rod Forum : Hotrodders Bulletin Board -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 06-03-2004, 12:44 AM
Last photo:
Join Date: Nov 2003
Location: Modesto
Age: 30
Posts: 222
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
gear ratio calculator?

I put in these figures in the calculator,

MPH = 140
tire diameter = 26.5 inches
rear gear ratio 3.08
trans gear ratio = 1:1 for 3rd gear of TH350

The RPMS it spit out were about 5,500 RPMS which is about the limit of my engine. Will my car really go this fast? Is this accurate? I dont have a speedometer, so I'm not sure but this doesnt seem right.


Last edited by M&M CUSTOM; 06-03-2004 at 06:05 AM.
Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 06-03-2004, 05:59 AM

Last journal entry: JB's 37 Pickup
Last photo:
Join Date: Oct 2002
Location: Smoky Mountains
Age: 78
Posts: 2,358
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
No. The calculator formula is pure math based on physics. There is no input for how many RPMs the the motor will turn under given loads. You plugged in the numbers to find out the revs at 140 and it tells you. It takes a pretty good motor to rev 5500 under load and the load that increases with speed is the wind or in more technical terms, friction caused by drag. And there are basically two types of drag on your automobile, parasite and induced. Parasite drag is determined by the shape, ie flat plate, protrusions etc (streamline is less, box is more) Induced drag is more from the turbulence behind the vehicle and the air being forced underneath (this is one of the reasons two or three NASCAR racers in a close line can pull away from cars racing side by side). After all of this gobble gook, as your speed increases, the load grows and the engine rev limit goes down as though you are climbing a hill that gets steeper and steeper.

Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

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

All times are GMT -6. The time now is 06:18 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.