auto trans loss ratio of hp - 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 04-22-2012, 03:17 PM
Registered User
Join Date: Aug 2011
Location: pittsburgh pa
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
auto trans loss ratio of hp

can anyone tell me what ratio loss of horse power you can expect when using a auto trans vs manual. and would one trans be better or worse then another, set up for drag racing.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 04-24-2012, 11:01 PM
Registered User
Join Date: Apr 2012
Posts: 1
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I'd think that it would be a plus to race with autos

I'd think that it would be a plus to race with autos for then you wouldn't lose the time to shiift and lose HP when doing the shifting.
In an automatic transmission, each gear possesses a device that, under specific rpm and engine vaccuum pressure, will change the gear. In a manual transmission, you are that device. Also, manual transmissions are geared differently, to make up for operator error when shifting. The differences are gears that are easier for the engine to turn, due to circumference of the gear. A higher gear robs horsepower.

Last edited by Crosley; 04-25-2012 at 05:53 AM. Reason: Violation of guidelines. Please see: general board guidelines.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-29-2012, 08:28 AM
Registered User
Last photo:
Join Date: Aug 2006
Location: Alexandria, VA
Posts: 1,989
Wiki Edits: 0

Thanks: 4
Thanked 108 Times in 104 Posts
Autos have the advantage of high stall torque converters for take-off, and consistent shifting. In a manual you have to depend on the clutch and the coordination with your arm moving the shifter. A manual has less power loss, but all it takes is one bad shift to wipe out any advantage.

You also need to consider what type of race you plan to run. In bracket races you need to be very consistent to win, and that will be harder with a manual.

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Auto Trans for '34 Plymouth rough_idle Transmission - Rearend 1 08-07-2008 10:36 AM
Trans Ratio juiced66malibu Transmission - Rearend 1 09-24-2005 10:11 AM
power loss from higher ratio rocker? KNanthrup Engine 5 08-26-2005 08:20 AM
Auto Trans Install tay Engine 3 06-13-2005 03:39 PM
auto trans to manual Jim Vines Transmission - Rearend 4 02-18-2003 09:57 PM

All times are GMT -6. The time now is 07:52 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.