# Single Digit Club - NHRA Comp B/A Class Index at 7.56 Seconds N/A!?

BlackBirds
09-13-2010, 12:32 PM
I've been doing research into the rules of NHRA's Comp Eliminator class, and the indexed times seem impossible! Theres a naturally aspirated class, B/A, that allows a ratio of 5.40 pounds of total car weight to cubic inches of the motor. So if you have a 2500lb F-body, the largest motor you could run is a 462ci. How can a naturally aspirated 462ci get a 2500lb car into mid to low 7's?? I know there are guys on here running in the sevens and sixes but their cars are all FI. The fastest N/A f-body I've been able to find runs mid eights. How can they do it?

TA1364
09-13-2010, 01:22 PM
If the index is 7.56, then the car would have to be pretty close to a 6 second range to be competitive. Is there an f-body running this class? I dont think I have ever seen one.

BlackBirds
09-13-2010, 01:30 PM
I'm not saying there is. I guess I'm just saying how can you get any 2500lb car with a naturally aspirated 462ci to run this fast? Or a 2000lb car with a 370ci would still have the 5.4:1 weight to cubic inch ratio.

Low 7's seems insane for a N/A car that has to have a 5.4:1 weight to cubic inch ratio. Minimum weight for this class is 1,500lbs, but this would force you to have a 277ci engine if you want the car to be this light.

TA1364
09-13-2010, 08:20 PM
Theres 500 cubic inch n/a motors running 6.50s in pro stock, its just all about the combination of parts.

zracer323
09-13-2010, 10:00 PM
Theres 500 cubic inch n/a motors running 6.50s in pro stock, its just all about the combination of parts.

Exactly. The caliber of cars that run in these classes are much different than you will see on this board. Plus they run blueprinted high \$ motors with the best of the best in parts.

BlackBirds
09-14-2010, 07:50 AM
yeah... i guess having the ability to rev to 10k RPM's will give you that.

TA1364
09-14-2010, 10:59 AM
I am willing to guess one of these cars is easily 200k+. Look around in classifieds for drag racing. 100k for a roller and you still need all the trick parts for a motor and transmission.

stumprrp
09-14-2010, 04:16 PM
im guessing a tunnel ram with 2 giant carbs at least 15:1 compression and spinning 9500-10000 RPM, 1 inch of valve lift, 5 inch collectors, who the hell knows.

BlackBirds
09-14-2010, 04:24 PM
yeah, that sounds about right... oh if only i had \$200k lying around haha.

Formula Stocker
09-14-2010, 08:06 PM
Our buddy Pete runs B/A. He has an old Mike Edwards car that was built by Bickel I think. Has a 440 c.i. W.J. motor, Liberty 5 speed, etc... I think he has been mid 6.90's. Pete has loads of money and this is a completely different animal as compared to trying to race an actual production car. Your only chance of that would be a super mod car. Those altered classes are all full tube frame chassis and thats why they can get them that light. This is all super high dollar chit and B/A is a pretty tight index to begin with. I love comp and luckily my friends have the ability and money to run it, but its HIGH DOLLAR. Just the inline 6 trailblazer motor we run is about 60K. Anyways, unless you got plenty of money to spare, stay away from comp, lol.

That why im building a stocker. Take care everybody

BlackBirds
09-15-2010, 08:34 AM
yeah thats what I'm learning, comp is EXPENSIVE. Seems like many of the classes are just pro-stock cars with slightly smaller engines so they can meet the weight to cubic inch requirements.

Panther 2
09-16-2010, 10:11 PM
The present NHRA national record for B/A is 7.01 @ 194.81 , 08 Pontiac

BlackBirds
09-16-2010, 11:05 PM
damn near pro-stock, im sure A/A is running times that are a few tenths off pro-stock

Formula Stocker
09-17-2010, 08:50 AM
The national record might be a 7.01 but as you all know a Record has to be set at a NHRA divisional race. Then you have to back it up. I know Pete has been a high 6.909 and I even think Sean Dodd has been a 6.99 in a B/AA. Here is a link to the D4 race in Houston this year.

6.909 @ 200.44 which was -.651 under on a 7.56 index

http://www.dragracecentral.com/drcstory.asp?ID=201498

Granted, Houston usually has some pretty killer air.

silverls1z28ofdeath
09-30-2010, 10:38 PM
There favorite expression is that loose is fast lol. Ya they have fully blue printed motors and these are not just a modified f-body by no means. These are 100,000 dollar cars without a motor or tranny. They were built just for racing, since they have full race struts and shit like that. I helped do clutches with a buddy that races one and every pass we would pull the clutch and adjust the gram weight on the fingers. They are a lot of work and everything spins like nasa designed so if you want to run with the real big boys you better have plenty of loot. And just member loose is fast.

TA1364
09-30-2010, 11:44 PM