1/4 mile opinions on setup ? - Page 2 - 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
  #16 (permalink)  
Old 10-17-2008, 09:25 AM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Pittsburgh, PA
Age: 40
Posts: 5,128
Wiki Edits: 16

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by chevy350_Camd
Okay Im a little ingnorant On the numbers side of this so Im not following what would I need to to use 4.53 gears nd have insane times with the setup, or could I build the th 350 with 4. 53 gears and have a reall jumpy truck ? Can you alter the gears in a tranny so that its really good at the 1/4 mile ?
The math is somewhat easy. The gear ratio of the tranny times the gear ratio of the rear tells you how many times the engine turns for every one revolution of the axle.

So, in the case of the 700r4, 3.06 first gear ratio times 4.56 rear gears means that the engine will turn 13.9 times for every one turn of the axle. That's a little excessive. A T56 with its 2.66 first gear and 4.56 means the engine turns 12.13 times for each axle turn. That's a little more realistic for your combo.

So, its not the tranny gears that have to change, but you have to know the tranny ratios before you can pick a rear ratio. I get so frustrated when people say things like "3.73 is a good street gear," because with a T56 that's a pretty conservative cruising mileage choice, but with a TH400 its a pretty racey choice.

The OD ratio will cut down on RPMs the same way a higher rear gear would. A T56 with 4.56 rear gears would have the same highway RPMs as a TH400 with 2.28 rear gears. Big difference.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 10-17-2008, 09:28 AM
chevy350_Camd's Avatar
VROOOM !!!!!!
 

Last journal entry: This is the Rough Draft of the V8 Frame
Last photo:
Join Date: Jan 2008
Location: Bluff City Kansas
Age: 21
Posts: 133
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
1/4 Setup

Okay curtiz what yould you suggest for my truck to runs in the 12s 13s ?
Thanks
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 10-17-2008, 09:30 AM
Registered User
 
Join Date: Oct 2008
Location: Dasyton, Ohio
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hey Camd, just for reference 2004 SSR, 5.3 liter, the two of us weigh 5000 lbs. 294 rwhp 4.56 rear gear 15.1 et 1/4 mile at 96 mph.
1978 pontiac firebird, 355 cu in. never dynoed, nicley moded, 3.73 gear 12.3 et @ 108 mph
Never thought either one would run this quick. Just build it then start tweakin.

Bud
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 10-17-2008, 09:32 AM
chevy350_Camd's Avatar
VROOOM !!!!!!
 

Last journal entry: This is the Rough Draft of the V8 Frame
Last photo:
Join Date: Jan 2008
Location: Bluff City Kansas
Age: 21
Posts: 133
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
1/4 speed

Okay but does anybody have a guessestimate on this setup 1/4 speed.

Would this work better, a th 400 with 4.53 gears ?, How many gears does a th400 have ?

Last edited by chevy350_Camd; 10-17-2008 at 09:42 AM.
Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 10-17-2008, 08:33 PM
chevy350_Camd's Avatar
VROOOM !!!!!!
 

Last journal entry: This is the Rough Draft of the V8 Frame
Last photo:
Join Date: Jan 2008
Location: Bluff City Kansas
Age: 21
Posts: 133
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
1/4 setup

Alright, I wanted to discuss if this setup would be good in a 1985 Chevy Silverado 1500 at a quarter mile
The trucks weighs 3890 alomst 4000, the motor is a 383 with a 750 cfm double pumper holley, A edelbrock Rpm manifold, thumpr cam with 500-517 lift with 300 310 adv duration, Edelbrock Rpm heads, and Flowtech headers, forged bottom end assembly, th400 with 4.53 gears.
I was wondering if anyone would have a clue to adavantages and disadvantages at a quarter mile. I do not have the forged assembly but thats all I need.
I was hoping this it would be around 14-12 seconds, with slicks
Thanks
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 10-20-2008, 03:51 PM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 799
Wiki Edits: 0

Thanks: 2
Thanked 64 Times in 58 Posts
I have a 1997 reg can shortbox, weighs 4000 lbs. With 4l60e, 4.10 gears, it has run a 14.8 at 94mph with a 2.007 60 ft, with a stock Vortec 350, air intake K&N, Hooker 2462 hkr longtubes, dual 2 1/2" exhaust with cats, Ed Wright Fastchip PCM tuning.
Stock it ran 15.7-8 at 85mph.

Stock Dodge 500 pace trucks with the 360 and the the Dodge factory installed performance ignition a factory performance headers/exhaust ran high 15's.

I had a 1984 long box reg cab, stock 1989 roller cam 305 longblock, Weiand Action+ intake, Quadrajet, in cap HEI dizzy, Hedman 1 5/8 x 3" lontubes, 3.07 12 bolt rear, 315/70/15 tires and ran a 17.4 at 84mph through a THM350 trans.


454SS trucks run low-mid 15's at low 80's for mph. The 90 SS runs a 400 trans with a 3.73 gear(they are rated at 230hp and 375 ;b/ft torque, the 91-93's run a 4l80e(same ratios as 400, but with a .75:1 OD) and are rated at 255hp and 405 lb/ft torque. These trucks are heavier as they have the 4l80e and 14 bolt rear end.

You DONT need the forged assembly. A cast 383 will do just fine, unless you are pushing over 500hp,6000 rpm REPEATEDLY or are using nitrous or forced induction.

peace
Hog
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
estimated 1/4 mile time?? tirefryin_s10 Hotrodding Basics 7 10-20-2006 12:54 PM
How to figure 1/4 mile speed and time? Rickand emily General Rodding Tech 3 05-02-2006 01:41 AM
My 1/4 mile times. HemmiGremmie Engine 8 12-13-2005 01:55 PM
HP estimate from 1/4 mile Blazin72 General Rodding Tech 3 10-15-2005 10:24 PM
Powertrax Locker: 1/4 mile time increase? purple1967camaro Transmission - Rearend 3 04-12-2004 07:23 PM


All times are GMT -6. The time now is 01:04 AM.


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.