Drag racing question - 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> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-12-2005, 02:41 PM
Malibu406's Avatar
New Member
 
Join Date: Aug 2002
Location: ohio
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Drag racing question

Can anyone explain why you have a faster MPH if you spin your tires off the line when racing. A knowledgeable racer explained to me why a few years back and I've been trying to explain to a few people, but I can't remember exactly why it happens. A few of my friends have got excited over their MPH on a run and they think its going to be more when they get their car to hook and launch good, I told them the MPH will go down a tad but they don't believe me.

Thanks for any help

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-12-2005, 05:09 PM
Rob Keller's Avatar
AKA:"SLOWRIDE66"take it easy!
 
Last wiki edit: How to post pictures on a forum
Last journal entry: 85 Suburban
Last photo:
Join Date: May 2004
Location: Central Florida U.S.A.
Age: 48
Posts: 4,297
Wiki Edits: 38

Thanks: 0
Thanked 1 Time in 1 Post
well dont quote me on this but i know that when a top fueler get moving the rear tires flex outward, in essence creating a bigger tire diameter creating more surface .

when the tire stands up its like it creates a overdrive adding more to the mix

but i think too much tire spin is going to effect your time

hope this helps

sr66
__________________
"SlowRide66"

"Illegitimis non carborundum"
Don't let the bastards grind you down!

Crankshaft Coalition Master List of Hotrodding Forums
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-12-2005, 05:22 PM
1982 SS's Avatar
Flamethrower
 

Last journal entry: More Cooling fan pictures.
Last photo:
Join Date: Mar 2005
Location: Utah
Age: 27
Posts: 340
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
When you spin your tires off the line, you move up in the RPM band because it is just spinning and not moving forewars. Rev's make MPH not ET when you aren't moving foreward. I get lousy RT's when I slip on the line.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-12-2005, 05:48 PM
steve t's Avatar
ex biker, now hotrodder
 
Join Date: Mar 2005
Location: NC
Age: 64
Posts: 863
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
spin and lose the race, they heat up tires before they stage.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-12-2005, 06:49 PM
1982 SS's Avatar
Flamethrower
 

Last journal entry: More Cooling fan pictures.
Last photo:
Join Date: Mar 2005
Location: Utah
Age: 27
Posts: 340
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Luckily, when I slip the other guy slips more (usually) I don't launch very hard compared to some others.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-12-2005, 08:11 PM
NXS's Avatar
NXS NXS is offline
wind & fire = guides to power
 
Last photo:
Join Date: Nov 2004
Location: Oklahoma
Posts: 1,534
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The reason is because the power exceeds the tires ability to grip the track. When this happens the tires spins. Well when the tire begins to spin its maximum grip lowers and less forward acceleration occurs resulting in a slower ET.{ I can see everybody rolling their eyes and thinking " No ******* Sherlock"}.


But what also happens is that energy is still being put into the tires as rotational inertia. At some point the vehicle speed will near the tire speed and the tires will grab. When they do grap it lunges the car forward as the inertia they have built is released as forward momentum.

Basically the tires act as a bettery to store the energy until it can be applied. Since the car has been under power for a longer period of time more Hp has been used and MPH is a function of the amount of Hp.
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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:
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
Drag Link Question (Center Tie Rod) Houman SS '70 Suspension - Brakes - Steering 2 03-26-2005 09:56 PM
Drag Racing the '78 78SilverShark Hotrodders' Lounge 8 10-21-2003 06:22 PM
Racing Gas Question Jag Daddy Engine 3 10-20-2003 04:01 PM
drag racing motor vega dog Engine 7 10-16-2002 07:22 AM


All times are GMT -6. The time now is 03:25 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.