NHRA Stock/Super Stock Classification - Page 2

Mike Carr · 12-01-2010, 11:27 PM

IHRA Super Stock Production is pounds per cubic inch. Weight of the car with driver, divided by the cubic inch of the engine = the class you will run. If it fits into, say, SS/PAA-1 (7 pound class) with a 427, you would weigh 2,989 pounds.

In horsepower to weight categories, IHRA generally mirrors the NHRA ratings, but not always. As an example, the 1990's LT-1 in a Camaro/Firebird for SS/IA, it's rated 279 in NHRA and still at 275 in IHRA.

All the IHRA info, including people to contact regarding a question, can be found here.

http://www.ihra.com/competition/index.php

Ryck Campbell · 12-02-2010, 09:18 PM

Bruno,

Actually there is no such thing as a "natural" class in NHRA SS/GT. Using the 12.98 weight break, the car's shipping weight is 2726. From there you can subtract a maximum of 250 pounds or add a maximum of 250 pounds to calculate what classes the car can fall in. With the maximum removal of 250 pounds the car won't make the top of GT/F(A) with the 230 hp engine but the car could:

run heavy in F @ 2670
G @ 2700
H @ 2815
I @ 2930
J @ 3045

using the 220 HP engine in would be:
heavy in G @ 2670
H @ 2700
I @ 2810
J @ 2920
K @ 3030
L @ 3140

This is using the data available as of today, 12/2/2010. Hope this clears things up a little.

1299 · 12-02-2010, 11:37 PM

so if t have a 83 grand prix (shiping w-3300) with a 327 nhra rated at 299
i can add 250 to it?
so 3550/299=11.87 which is gt/h or remove 250 and get 3050/299=gt/e
so i can run from e-h????

Ryck Campbell · 12-03-2010, 07:10 AM

Yes, a 1983 Grand Prix Coupe 2 door Brougham's shipping weight is 3300. With a 327 rerated to 299 hp the car would run:

heavy in E @ 3220
F @ 3305
G @ 3455
H @ 3605

12-01-2010, 11:27 PM	#11
Mike Carr VIP Member Join Date: Nov 2001 Location: Enon Valley PA Posts: 1,650 Likes: 234 Liked 83 Times in 37 Posts	Re: NHRA Stock/Super Stock Classification IHRA Super Stock Production is pounds per cubic inch. Weight of the car with driver, divided by the cubic inch of the engine = the class you will run. If it fits into, say, SS/PAA-1 (7 pound class) with a 427, you would weigh 2,989 pounds. In horsepower to weight categories, IHRA generally mirrors the NHRA ratings, but not always. As an example, the 1990's LT-1 in a Camaro/Firebird for SS/IA, it's rated 279 in NHRA and still at 275 in IHRA. All the IHRA info, including people to contact regarding a question, can be found here. http://www.ihra.com/competition/index.php __________________ Mike Carr, Tri-State S/SS Association President Looking for 2015 S/SS Race Sponsors Contact me if interested buffdaddy_1302@hotmail.com (724) 510-5912

12-02-2010, 09:18 PM	#12
Ryck Campbell Junior Member Join Date: Dec 2001 Location: Rome, NY Posts: 56 Likes: 176 Liked 46 Times in 10 Posts	Re: NHRA Stock/Super Stock Classification Bruno, Actually there is no such thing as a "natural" class in NHRA SS/GT. Using the 12.98 weight break, the car's shipping weight is 2726. From there you can subtract a maximum of 250 pounds or add a maximum of 250 pounds to calculate what classes the car can fall in. With the maximum removal of 250 pounds the car won't make the top of GT/F(A) with the 230 hp engine but the car could: run heavy in F @ 2670 G @ 2700 H @ 2815 I @ 2930 J @ 3045 using the 220 HP engine in would be: heavy in G @ 2670 H @ 2700 I @ 2810 J @ 2920 K @ 3030 L @ 3140 This is using the data available as of today, 12/2/2010. Hope this clears things up a little. __________________ Ryck Campbell NHRA Technical Specialist

12-02-2010, 11:37 PM	#13
1299 Member Join Date: Aug 2009 Location: howell,nj Posts: 125 Likes: 313 Liked 54 Times in 12 Posts	Re: NHRA Stock/Super Stock Classification so if t have a 83 grand prix (shiping w-3300) with a 327 nhra rated at 299 i can add 250 to it? so 3550/299=11.87 which is gt/h or remove 250 and get 3050/299=gt/e so i can run from e-h????

12-03-2010, 07:10 AM	#14
Ryck Campbell Junior Member Join Date: Dec 2001 Location: Rome, NY Posts: 56 Likes: 176 Liked 46 Times in 10 Posts	Re: NHRA Stock/Super Stock Classification Yes, a 1983 Grand Prix Coupe 2 door Brougham's shipping weight is 3300. With a 327 rerated to 299 hp the car would run: heavy in E @ 3220 F @ 3305 G @ 3455 H @ 3605 __________________ Ryck Campbell NHRA Technical Specialist