NHRA......ET. vs IRS ?
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
NHRA......ET. vs IRS ?
I was at the shop last night checking out my new JE pistons. They were saying that I will need to consider a solid axle for my car because I should be in able to run 10's and I will be illegal going that quick with my IRS.
I know there are a lot of you here running 10's & 11's with some even in the 9's. Are you guys running into any problems with this ? I do have the half shaft safety loops installed for what it's worth.
TIA
I know there are a lot of you here running 10's & 11's with some even in the 9's. Are you guys running into any problems with this ? I do have the half shaft safety loops installed for what it's worth.
TIA
Team Owner
Joined: Nov 1999
Posts: 32,782
Likes: 11
From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: NHRA......ET. vs IRS ? (SmokedTires)
C3's only need solid rears at 10.99.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: NHRA......ET. vs IRS ? (Major Spray)
IRS is only legal to 10.99 except in a C5. This is because a C5 has upper and lower control arms.
RACE ON!!!
Le Mans Master
Joined: Jan 2003
Posts: 6,298
Likes: 0
From: Tyler TX
Re: NHRA......ET. vs IRS ? (Major Spray)
Mike
IRS is only legal to 10.99 except in a C5. This is because a C5 has upper and lower control arms.
hope that helps you
IRS is only legal to 10.99 except in a C5. This is because a C5 has upper and lower control arms.
hope that helps you
Le Mans Master
Joined: Jun 2003
Posts: 5,446
Likes: 2
From: Not Correctly Restored Stingray Fla.
Re: NHRA......ET. vs IRS ? (CFI-EFI)
There is a red C3 (Mike Coffey) running mid 10's with IRS at Moroso Motorsports Park which is an NHRA track. Good looking car too!!! :thumbs:
Team Owner
Joined: Dec 2000
Posts: 27,897
Likes: 9
From: I have no tolerence for liberals and fools, but sometimes i repeat myself
CI 3-5-7-8-9 Veteran
St. Jude Donor '08
Re: NHRA......ET. vs IRS ? (lotahp)
hate to break this to you but our 68 NHRA A/SA still has teh IRS and passes tech and run's mid 10's :D
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: NHRA......ET. vs IRS ? (vetteman9368)
hate to break this to you but our 68 NHRA A/SA still has teh IRS and passes tech and run's mid 10's :D
RACE ON!!!
PS. I am not saying how any given track will treat any particular racer. Different tracks apply the rules differently. I am merely citing what is printed in the "NHRA Rulebook". Your mileage may vary.
[Modified by CFI-EFI, 6:06 PM 11/19/2003]
Team Owner
Joined: Dec 2000
Posts: 27,897
Likes: 9
From: I have no tolerence for liberals and fools, but sometimes i repeat myself
CI 3-5-7-8-9 Veteran
St. Jude Donor '08
Re: NHRA......ET. vs IRS ? (CFI-EFI)
hate to break this to you but our 68 NHRA A/SA still has teh IRS and passes tech and run's mid 10's :D I checked this out. Under section, 5A, Stock Cars (as in cars running NHRA stock classes), There is no mention of the necessity to change to a solid axle. Only that it is permitted. Since I, and most of the readers and participants of this secton of the forum are bracket racers, the rule I am refering to is in secton, 1A, E.T. Handicap Racing. That section of the rule book specifically cites 1963 -1982 Corvettes as need a solid axle at 10.99. If it was meant to cover C4's, it would have said 1963-1996. It doesn't. IRS cars (not just Corvettes) that don't require a solid axle at 10.99, DO require halfshaft loops at 10.99. I hope this helps to clear things up. Buy the book! Good luck, and...
RACE ON!!!
RACE ON!!!
i have read that section of the book, and there is a kit offered by Tom's differential in California that makes a 63-82 rear legal :thumbs:
http://www.tomsdifferentials.com/cat24.htm
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: NHRA......ET. vs IRS ? (vetteman9368)
i have read that section of the book, and there is a kit offered by Tom's differential in California that makes a 63-82 rear legal :thumbs:
RACE ON!!!
Team Owner
Joined: Dec 2000
Posts: 27,897
Likes: 9
From: I have no tolerence for liberals and fools, but sometimes i repeat myself
CI 3-5-7-8-9 Veteran
St. Jude Donor '08
Re: NHRA......ET. vs IRS ? (CFI-EFI)
i have read that section of the book, and there is a kit offered by Tom's differential in California that makes a 63-82 rear legal :thumbs: The rulebook makes no mention of upgrading the axle, simply the replacement. I don't know why this wouldn't be acceptable, though.
RACE ON!!!
RACE ON!!!
Drifting
Joined: Apr 2003
Posts: 1,405
Likes: 0
From: Fort Salonga NY
Re: NHRA......ET. vs IRS ? (vetteman9368)
I have the Book and I stand by my original post I have gone thru tons of BS with division 1 and as far as NHRA in my neck of the woods is concerned I am correct. If you get away with it good for you :cheers:
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
Re: NHRA......ET. vs IRS ? (Major Spray)
Well it seems that it's written in the book that I will need a solid axle, but it may depend upon the track. So I guess I will go to the track next year and see what they say :rolleyes: .
I have upgraded my inner side axles to Tom's 30 spline along with the safety loops, so I have stepped things up back there for some safety :)
My Tom's posi & axles:
[Modified by SmokedTires, 7:15 AM 11/20/2003]
I have upgraded my inner side axles to Tom's 30 spline along with the safety loops, so I have stepped things up back there for some safety :)
My Tom's posi & axles:
[Modified by SmokedTires, 7:15 AM 11/20/2003]
Team Owner
Joined: Dec 2000
Posts: 27,897
Likes: 9
From: I have no tolerence for liberals and fools, but sometimes i repeat myself
CI 3-5-7-8-9 Veteran
St. Jude Donor '08
Re: NHRA......ET. vs IRS ? (Major Spray)
I have the Toms Third Member setup in my mid year it is bullet proof but not legal below 10.99.
Good Luck
Good Luck
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
Re: NHRA......ET. vs IRS ? (vetteman9368)
Cool, I'll look into the upper control arms & see if it's something I want to tackle :crazy: Thanks :cheers:
Drifting
Joined: Apr 2003
Posts: 1,405
Likes: 0
From: Fort Salonga NY
Re: NHRA......ET. vs IRS ? (vetteman9368)
I have the Toms Third Member setup in my mid year it is bullet proof but not legal below 10.99.
Good Luck the upper control arms that Tom's sells make the 63-82 rear NHRA legal, i have spoke with both Div2 and Div 4 tech people about that on several occasions. We were looking at installing them on our stocker just for safety reasons. They explained that they would be legal in brackets, or in SuperStock, but not in Stock because it alters the suspension design
Good Luck the upper control arms that Tom's sells make the 63-82 rear NHRA legal, i have spoke with both Div2 and Div 4 tech people about that on several occasions. We were looking at installing them on our stocker just for safety reasons. They explained that they would be legal in brackets, or in SuperStock, but not in Stock because it alters the suspension design
Team Owner
Joined: Dec 2000
Posts: 27,897
Likes: 9
From: I have no tolerence for liberals and fools, but sometimes i repeat myself
CI 3-5-7-8-9 Veteran
St. Jude Donor '08
Re: NHRA......ET. vs IRS ? (Major Spray)
I have the Toms Third Member setup in my mid year it is bullet proof but not legal below 10.99.
Good Luck the upper control arms that Tom's sells make the 63-82 rear NHRA legal, i have spoke with both Div2 and Div 4 tech people about that on several occasions. We were looking at installing them on our stocker just for safety reasons. They explained that they would be legal in brackets, or in SuperStock, but not in Stock because it alters the suspension design
I didn't know that Tom's made upper control arms for this aplication thanks for the Info. :cheers:
Good Luck the upper control arms that Tom's sells make the 63-82 rear NHRA legal, i have spoke with both Div2 and Div 4 tech people about that on several occasions. We were looking at installing them on our stocker just for safety reasons. They explained that they would be legal in brackets, or in SuperStock, but not in Stock because it alters the suspension design
I didn't know that Tom's made upper control arms for this aplication thanks for the Info. :cheers:
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: NHRA......ET. vs IRS ? (vetteman9368)
The rulebook makes no mention of upgrading the axle, simply the replacement. I don't know why this wouldn't be acceptable, though.
RACE ON!!!
if you read and re-read it says that any IRS w/o upper and lower control arms is illegal, it gives the STOCK 63-82 as an EXAMPLE. From my understanding with Tom's kit it is legal as fast as you wanna go
RACE ON!!!
if you read and re-read it says that any IRS w/o upper and lower control arms is illegal, it gives the STOCK 63-82 as an EXAMPLE. From my understanding with Tom's kit it is legal as fast as you wanna go
RACE ON!!!