Horsepower Reduction?
 

If a motor fits into multiple body styles and 1 body style asks for HP reduction will all body styles receive reduction if they are less then .5 under index?
My 307 Olds fits in Cutlass sedan and station wagon. Will asking for reduction in 1 car effect both cars if granted.

Re: Horsepower Reduction?
 

I'm thinking no...but with that said, NHRA is still a mystery to me..

1969 Chevrolet 441 head 255HP is rated by NHRA at 280, 275 or 263HP depending on body style ...

I still don't understand the NHRA logic on that one?????

The 69 Impala Sport hardtop is rated at 275HP while the wagon is rated at 263HP. They both have the same frontal area (drag) so the only difference is weight.

The 69 Chevelle also has the sedan and station wagon at different horsepower..

The different ratings for a Camaro vs an Impala or a Chevelle make sense because of the difference in drag.

I'm confused

Re: Horsepower Reduction?
 

Thanks I think. In my case the sedan and wagon are at the same HP now. Im thinking of asking for reduction to get my wagon in U at 4300 down some weight to keep up with 302 Fords. The Olds is now 207 up 69 HP over factory.

Re: Horsepower Reduction?
 

Hi,

Just one more question....

Why do you believe that that wagon should have a lower horsepower rating than the sedan???

The class is sorted out by weight to horsepower.

Just sayin'

Re: Horsepower Reduction?
 

It's actually the opposite. The owner of the sedan is thinking about asking. I became curious about getting HP off my same motor in a different car. Then I started thinking do I need to write in or we'll it take fix itself with 1 letter. I don't have much to stand on add the divisional is my first race in years and I have allot of tuning to do.

Re: Horsepower Reduction?
 

OK.....Thanks

Re: Horsepower Reduction?
 

Bob, one of the determining factors is wheelbase. Impala wagon has longer wheelbase than Impala hardtop.
69 Chevelle 2door has shorter wheelbase than 4 door sedan and wagon.
69 Camaro has shorter wheelbase than Nova.
Ya can't make this stuff up!

Re: Horsepower Reduction?
 

Does a wagon have more aero drag because of the long roof and side windows? It seems like it would.

Re: Horsepower Reduction?
 

Just fil out the form and send it in. Its easy. Doesn't hurt to ask especially if nobody has gone fast with the combo in a few years.

Re: Horsepower Reduction?
 

Jeff, call me 443-309-0365

Re: Horsepower Reduction?
 

Now I am really confused...…

69 ChevyII 111" WB vs 68 Camaro 108" WB both rated the same 235/255/280HP

69 Impala Sport 119" WB rated 350/255/275HP...
69 Full Size SW 119" WB rated 350/255/263HP = 12HP less

69 Chevelle 2 door 112" WB & 4 door 116" WB both rated the same 350/255/280HP
69 Chevelle SW 116" WB rated 350/255/275HP
69 Chevelle SW & 4 door same 116" WB = 5HP difference

Re: Horsepower Reduction?
 

You have to request HP off a given combo. If it qualifies for a reduction, that specific combo will get reduced. Similar platform combo's may also get reduced, but only that specific year. I had my 1978 Nova 305/145 reduced, and they reduced the Buick, Pontiac, and Oldsmobile versions of the Nova with the exact same motor as well, but only in 1978. No other cars/body styles were reduced. There are criteria for minimum, maximums, and average et's for the combo that determine eligibility for reduction and how much. Those are spelled out in the NHRAracer website under the Automatic Horsepower Factor System link.

Fill out the form, never hurts to ask!

Re: Horsepower Reduction?
 

This horsepower thing has really got out of hand.
For me an engine hp rating is just that, stick,auto long/short wheelbase, convertible etc.
The biggest reason for this result came when they allowed the combo's to move up one Class,that meaning the same Cars could dominate one more class,thus other Cars started need some help and there we went!
Before that rule was changed the classes where protected from certain Cars.

Re: Horsepower Reduction?
 

That's what I was thinking.
5 minutes to fill out the form.

Worst that could happen is they say no.

Of course the person filling out the request would have to be the driver that drove that combo at a national or Divisional event this year.

Just have to get it done before the Monday after the World Finals in November.

http://www.nhraracer.com/ahfs.asp

Re: Horsepower Reduction?
 

Get the letters in early, it will allow NHRA time to do nessary research to get it correct. I think the cut off date for requests to be reviewed is sometime in October. I could be wrong. If the letter is late it will be considered in the next review period. Reduction in Hp is an annual end of year, so get it in now or wait till next year.

Let me add this if the facts support reduction or additions according to AHFS guidelines it will usually happen.

Re: Horsepower Reduction?
 

1979 malibu wagon 350 287 hp. 1979 nova 350 279 hp. 1979 camaro 350 283 hp. 1979 corvette 350 283 hp. 1979 cutlass wagon 275 hp. with same chevy 350, also it can have aluminum hood & radiator support, same car just different header panel & dash, Malibu wagon with 350 got hp. twice, first time with camaro & corvette, second time with camaro, i looked in nitro joe`s books best run i could find was 6 tens under old index for malibu wagon 350. NHRA took hp. back off camaro & corvette & not the malibu wagon.

Re: Horsepower Reduction?
 

Actually, no this is not the case....

Re: Horsepower Reduction?
 

Im actually going to Div 7 race in 2 weeks. I should be in good weather and I have 1 more night to test. We will see how fast I am and send letter in the following Monday.

Re: Horsepower Reduction?
 

I sent my letter in yesterday for my combo

Re: Horsepower Reduction?
 

If you go to the NHRA Competition page (link on top here) it is all spelled out verbatim on the Automatic Help For Slugs (AHFS) link. Cars are separated by “platform”. Ie Skylark & Regal (1978) are separate one is a Gbody one is Kbody.

Happy HP hunting ... God knows the Ffford 302 2bbl had a good day January 1 2014 😡

Re: Horsepower Reduction?
 

Jack I was waiting for a response from you. I thought you were going to set me on fire for asking for welfare. Im not the smartest guy, but I know I cant keep up with the 302 2v

Re: Horsepower Reduction?
 

In what way ?

What is the correct way then ?

Re: Horsepower Reduction?
 

Let me clue you in.....Anyone that has the talent to send an e mail asking for WELFARE can do it. They don’t need to be the car owner, driver ...etc....

Re: Horsepower Reduction?
 

Interesting....


That's not what Pat C. in Glendale told me. Guess I was mis-informed.

But it's good to hear someone who doesn't even race a certain combo can get a hp reduction....:rolleyes:

Re: Horsepower Reduction?
 

MJ is right ... however most people aren’t in the habit of getting competitors HP off 🤔😬

Re: Horsepower Reduction?
 

It was an early XMAS gift for my little buddy in PENNSYLVANIA. Funny thing is , he never gave his wish list to SANTA ,,,,,SANTA is magical .....

Re: Horsepower Reduction?
 

Some years back:


78 Aspen/Volare Wagon (112.3 WB) 360 Small Cam........289HP
78 Aspen/Volare 2 Dr. (108 WB) 360 Small Cam........270HP

See how often you win Class/Heads Up in the wagon!!