Manual to Automatic & E.Ts - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



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

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-31-2008, 12:44 AM
oregon chevelle's Avatar
Member
 
Last photo:
Join Date: Jul 2005
Location: oregon
Age: 50
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Manual to Automatic & E.Ts

I am going to be swapping out the manual for an automatic so I can be more consistent at the track this year. The auto will be a reverse valve body TH400. I am also hoping to lower my times with this trnasmission as it should hook better and shift quicker than I could with the manual. I am not sure what the stall speed on the cnverter is so I am not sure how it will launch actually. The transmission is coming off a fairly mild 454 motor that I will use in another car down the road. So what do you all think? Will it run faster or not. I am sure it will be more consistent and that is the main thing in bracket racing anyway. My car ran a best of 13.74 at 99.74 last year with a 60ft time of 2.11. Cam is a single pattern 454 oft and 216 duration. I will also swap from a performer intake to a Holley Street Dominator and from an Edlebrock 600 to a Holley 650. I think they may be more than the cam needs? Heads are Trick Flow and are not being used much at all with the mild cam I have. That too will be changed eventually.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-31-2008, 06:12 AM
Will I ever get it done?
 

Last journal entry: Leading
Last photo:
Join Date: Oct 2004
Location: Tulsa, OK
Age: 57
Posts: 1,048
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
A long time ago, I was always told that an auto car would have lower et's than a manual car (assuming the manual car was driven by someone who could shift it properly). But before giving an answer from old information, I decided to look at the NHRA indexes and records. In the quicker Stock classes (A/S, B/S, A/SA, B/SA, etc.), the indexes and records indicate you can plan on a manual car being about 0.05 seconds quicker than a auto car. With some fluctuation, this holds true until you get down around T/S T/SA. The lower class automatic cars are quicker than the manual cars. This would lead me to believe that in the lower the weight to horsepower ratio cars, the manual car would be quicker. Heavier, lower powered cars benefit from an automatic.
The thing is, and you already recognize this, et's don't win bracket races. Consistency does. If you can't consistently shift a stick car, you are going to be way ahead with an auto.
FYI, your et is equivalent to a R/S or a U/SA. 18.00 to 18.99 lbs. per horsepower and 20 or more lbs. per horsepower respectively.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-31-2008, 01:49 PM
oregon chevelle's Avatar
Member
 
Last photo:
Join Date: Jul 2005
Location: oregon
Age: 50
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the input! I do not know what R/S or U/SA is?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-31-2008, 02:44 PM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 61
Posts: 16,791
Wiki Edits: 5

Thanks: 19
Thanked 239 Times in 194 Posts
In theory, a standard tranny will be quicker than an automatic, provided the driver is perfect with the shifting. This is due to less slippage. A torque converter always has some slippage.

Quote:
Originally Posted by oregon chevelle
I do not know what R/S or U/SA is?
Those are stock eliminator classes.....Stock and stock automatic. The letter in front is the rating...."A" being the quicker and so on...due to various rules
__________________
Ontario Rodders
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-31-2008, 04:34 PM
Member
 
Last wiki edit: Calculating tire size
Last journal entry: Changes...
Last photo:
Join Date: Oct 2003
Location: Montreal
Age: 28
Posts: 532
Wiki Edits: 2

Thanks: 0
Thanked 2 Times in 2 Posts
Why not a th350?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-31-2008, 05:59 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,182
Wiki Edits: 0

Thanks: 2
Thanked 292 Times in 289 Posts
Nice looking Chevelle.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-01-2008, 05:04 PM
oregon chevelle's Avatar
Member
 
Last photo:
Join Date: Jul 2005
Location: oregon
Age: 50
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the compliment. As for why not a TH 350? I already have a TH400 built from another car.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

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:
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.




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
From automatic to manual trans Camaro71 Transmission - Rearend 7 12-18-2007 04:18 PM
manual or automatic trans 348chevy Transmission - Rearend 1 09-07-2006 07:29 PM
Which would be preferred for a 1927 Model T: Manual or Automatic transmission? jesseeee Transmission - Rearend 5 02-17-2006 07:39 AM
manual or automatic? Nos Transmission - Rearend 7 08-29-2003 02:06 PM
automatic to manual 97bird Transmission - Rearend 0 01-22-2003 09:43 PM


All times are GMT -6. The time now is 10:33 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.