HOME FORUM RULES CONTACT
     
   
   

Go Back   CLASS RACER FORUM > Class Racer Forums > Stock and Super Stock Tech
Register Photo Gallery FAQ Community Calendar

Reply
 
Thread Tools Display Modes
Old 07-24-2009, 03:02 PM   #11
Jerry Hatch
Junior Member
 
Jerry Hatch's Avatar
 
Join Date: Apr 2008
Location: Lubec, Maine
Posts: 72
Likes: 7
Liked 0 Times in 0 Posts
Default Re: front tire size worth in delay

Quote:
Originally Posted by racer913 View Post
I have ben having a problem with being able to go red I need to know what tire size is worth in roll out delay I have 26" tires on and I need about .010 would a 28" tire work?
racer913,

Depending on what you have for a car, a two inch taller tire may be exactly what you are looking for in reaction time gains (or in your case, loss). I bracket raced a ’65 Dodge Coronet 500 2 dr. hardtop for nearly 14 years with the same combination. It was making approximately 425hp, ran 7.50’s 1/8th and 11.90’s in the ¼ with 1.55-1.58 60 ft depending on the track and conditions. I was not happy with my reaction times with a 26” tire in the beginning and went to the taller 28” tire. After doing so, I lost approximately .010 - .015 in reaction times. My car weighted nearly 3600#. Keep in mind that air quality plays a substantial role in how quick a car of this weight and hp moves off the line. Lighter quicker cars will not see the same loss in reaction times as a heavier car with this same tire change. Jerry.
__________________
In God I trust.
Jerry Hatch is offline   Reply With Quote
Old 07-24-2009, 03:53 PM   #12
tpoh815
Senior Member
 
tpoh815's Avatar
 
Join Date: Oct 2003
Location: West Seneca
Posts: 537
Likes: 62
Liked 28 Times in 11 Posts
Talking Re: front tire size worth in delay

Jerry sounds about right .Chip holy cow, easy on the knowledge. Thats 20 years in 2 min!
__________________
EX 5-Doorstocker
tpoh815 is offline   Reply With Quote
Old 07-24-2009, 04:09 PM   #13
442OLDS
VIP Member
 
442OLDS's Avatar
 
Join Date: Sep 2004
Location: Elgin,IL
Posts: 1,339
Likes: 5
Liked 282 Times in 103 Posts
Talking Re: front tire size worth in delay

If you are redlighting,try taking a couple of aspirin.If your lights are slow,drink a few bottles of Mountain Dew!
442OLDS is offline   Reply With Quote
Old 07-24-2009, 04:36 PM   #14
treessavoy
VIP Member
 
Join Date: Feb 2009
Location: Dunnellon,FL
Posts: 1,103
Likes: 0
Liked 4 Times in 4 Posts
Default Re: front tire size worth in delay

Quote:
Originally Posted by SmallBlockNova View Post
You get a longer "run" at the beam before you knock the stage light out and start the clocks..
True you get a longer run but the roll out distance is the same, the taller the tire the sooner you can leave on the tree.

Small tire, big tire you still have to roll that 9 inches to break the beam.
__________________
Jim Rountree
treessavoy is offline   Reply With Quote
Old 07-24-2009, 04:44 PM   #15
Jim Wahl
Veteran Member
 
Jim Wahl's Avatar
 
Join Date: Jan 2002
Location: Central Florida
Posts: 5,844
Likes: 667
Liked 683 Times in 129 Posts
Send a message via AIM to Jim Wahl Send a message via Yahoo to Jim Wahl
Thumbs up Re: front tire size worth in delay

Quote:
Originally Posted by 442OLDS View Post
If you are redlighting,try taking a couple of aspirin.If your lights are slow,drink a few bottles of Mountain Dew!
This is funny! I don't care who you are! Jim
__________________
Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess)
2019 Baby Gators Stock Champion
2009 NHRA D2 National Open Stock Champion
1982 NHRA D2 West Palm Beach LDRS SS Runner Up
Past President, Southern Stock / Super Stock Association.
Jim Wahl is offline   Reply With Quote
Old 07-24-2009, 04:50 PM   #16
SmallBlockNova
Junior Member
 
SmallBlockNova's Avatar
 
Join Date: Dec 2007
Location: Long Island
Posts: 47
Likes: 0
Liked 0 Times in 0 Posts
Send a message via AIM to SmallBlockNova
Default Re: front tire size worth in delay

Quote:
Originally Posted by treessavoy View Post
True you get a longer run but the roll out distance is the same, the taller the tire the sooner you can leave on the tree.

Small tire, big tire you still have to roll that 9 inches to break the beam.
The taller tire is able to move more distance before the beam is broken, thus resulting in quicker ET's yet slower RT's. Think about it...There's still 6 inches between the stage beams. If you take a tire that is 26" in diameter and center it on those beams, then roll it and write down the distance it rolled before the beam was broken...Then do the same with a 28" tire...The 28" tire will roll more distance before it breaks the beam.

Last edited by SmallBlockNova; 07-24-2009 at 04:55 PM.
SmallBlockNova is offline   Reply With Quote
Old 07-24-2009, 06:25 PM   #17
Michael Beard
VIP Member
 
Michael Beard's Avatar
 
Join Date: Sep 2002
Location: Columbus, OH
Posts: 4,060
Likes: 0
Liked 13 Times in 9 Posts
Default Re: front tire size worth in delay

Hatch is correct. Given 'typical' and equivalent tire pressures, a 2" diameter change will probably net you .010-.015. I went the other way a number of years ago, trying to deal with the very loose rollout at Quaker City. I went from a 25-26" tall street type tire to a 23" frontrunner, and was surprised to find that I only gained about .015 in r/t.

Quote:
Originally Posted by treessavoy View Post
True you get a longer run but the roll out distance is the same, the taller the tire the sooner you can leave on the tree.

Small tire, big tire you still have to roll that 9 inches to break the beam.
What you are saying is only applicable if you're deep-staging, in which case you have part of the tire *in front of* of the stage beam, with the remainder being between the stage and pre-stage beams. In regular staging, the 'extra' tire is still *behind* the pre-stage beam, and that too needs to clear the stage beam to stop the r/t clock.

Much of this is discussed in my Guide to Bracket Racing, at www.staginglight.com/guide/
__________________
Michael Beard - NHRA/IHRA 3216 S/SS
Michael Beard is offline   Reply With Quote
Old 07-25-2009, 10:05 AM   #18
novanicks
Junior Member
 
Join Date: May 2008
Posts: 16
Likes: 0
Liked 0 Times in 0 Posts
Default Re: front tire size worth in delay

In my experience, you will get exactly what you need in changing the tire. I would even suggest that it would be worth .010 and up to .020. Just make sure that if it makes you too slow that you have a way to add some reaction time back if needed.

Nick Shepherd
novanicks is offline   Reply With Quote
Old 07-28-2009, 08:08 AM   #19
Ed Wright
Veteran Member
 
Ed Wright's Avatar
 
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
Likes: 896
Liked 390 Times in 170 Posts
Default Re: front tire size worth in delay

Quote:
Originally Posted by treessavoy View Post
Stock drivers are known for the quickest and consistent reaction times and most of us run tall tires.

Really?? First time I've heard or read this. The only National Dragster I have on hand right now has E-Town sportsman coverage. I averaged the Comp, SS and Stock elimination round reaction times. Comp had 8 red lights, average reaction time was .0675. (Wonder why Fletch and Biondo do so well there.) SS had 4 red, average reaction time was .0335, Stock had 3 red, average was .0448. The .90 classes, of course, killed us all. Should with all the crap they have on those cars. I can't see why foot brakers would have any advantage, from what I have seen S & SS are normally pretty close in that dept.
__________________
Ed Wright 4156 SS/JA
Ed Wright is offline   Reply With Quote
Old 07-28-2009, 11:37 AM   #20
Michael Beard
VIP Member
 
Michael Beard's Avatar
 
Join Date: Sep 2002
Location: Columbus, OH
Posts: 4,060
Likes: 0
Liked 13 Times in 9 Posts
Default Re: front tire size worth in delay

Quote:
Originally Posted by novanicks View Post
In my experience, you will get exactly what you need in changing the tire. I would even suggest that it would be worth .010 and up to .020. Just make sure that if it makes you too slow that you have a way to add some reaction time back if needed.
On the plus side, changes in rollout will effect your reaction time far more than it will your E.T.'s At some loose rollout tracks, I've taken 2 bumps after staging to pick up .015 in r/t, but only loose a few thou in 60' & E.T. IMO, it's a good tradeoff.
__________________
Michael Beard - NHRA/IHRA 3216 S/SS
Michael Beard is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 04:17 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.