LS1 Horsepower Factors

442OLDS · 01-09-2023, 11:28 AM

I recently bought a copy of Nitro Joe's Stats on Ebay.(Nice job by the way).
I really wasn't aware of some of the horsepower factors in some of the classes I don't compete in.
It appears that there is an LS1 in some bodies that is at 381.
Then there is a manual transmission combo that is something like 40 horsepower less than the 381 of the same body.
Then,if it is in a Corvette,you see 350.But in a Firebird, it's 381
Are these engines all the same or are there differences?

Bobby Lundholm · 01-09-2023, 12:01 PM

Quote:

Originally Posted by 442OLDS

I recently bought a copy of Nitro Joe's Stats on Ebay.(Nice job by the way).
I really wasn't aware of some of the horsepower factors in some of the classes I don't compete in.
It appears that there is an LS1 in some bodies that is at 381.
Then there is a manual transmission combo that is something like 40 horsepower less than the 381 of the same body.
Then,if it is in a Corvette,you see 350.But in a Firebird, it's 381
Are these engines all the same or are there differences?

They are the same. Everyone and their brother ran a Firebird or Camaro with that combo. Corvettes didn't get as much attention until recently and they've done a good job at protecting that combo.

Tar Heel · 01-09-2023, 12:12 PM

How does the GTO fit into that conversation?

Bobby Lundholm · 01-09-2023, 12:58 PM

Quote:

Originally Posted by Tar Heel

How does the GTO fit into that conversation?

Same setup as the Corvette. Factored to 340 hp.

Jack Matyas · 01-09-2023, 08:11 PM

Quote:

Originally Posted by 442OLDS

I recently bought a copy of Nitro Joe's Stats on Ebay.(Nice job by the way).
I really wasn't aware of some of the horsepower factors in some of the classes I don't compete in.
It appears that there is an LS1 in some bodies that is at 381.
Then there is a manual transmission combo that is something like 40 horsepower less than the 381 of the same body.
Then,if it is in a Corvette,you see 350.But in a Firebird, it's 381
Are these engines all the same or are there differences?

Seems to me your real agenda is to bring attention to the cars you do compete against like the GTO with an LS1 style engine .There are now plenty of them out there and they do their best to protect their combos - something more guys ( and gals ) should have done years ago .As for the Firebirds with the 381 rating - well, they didn't do such a good job .We can also talk about the guy from Crawdad Country who is now our World Champ that can win no matter how far under he is but we'll save that for another time ! !

442OLDS · 01-09-2023, 08:44 PM

Quote:

Originally Posted by Jack Matyas

Seems to me your real agenda is to bring attention to the cars you do compete against like the GTO with an LS1 style engine .There are now plenty of them out there and they do their best to protect their combos - something more guys ( and gals ) should have done years ago .As for the Firebirds with the 381 rating - well, they didn't do such a good job .We can also talk about the guy from Crawdad Country who is now our World Champ that can win no matter how far under he is but we'll save that for another time ! !

I don't have an agenda.I just find it fascinating the massive differences in horsepower factors with cars using the exact same engine.40 horsepower difference based on body type?
40 horsepower difference based on transmission type?
It doesn't matter if they were at 340 or 380,I still wouldn't ever outrun one.

Glenn Briglio · 01-09-2023, 11:26 PM

Quote:

Originally Posted by 442OLDS

I don't have an agenda.I just find it fascinating the massive differences in horsepower factors with cars using the exact same engine.40 horsepower difference based on body type?
40 horsepower difference based on transmission type?
It doesn't matter if they were at 340 or 380,I still wouldn't ever outrun one.

Can’t beat them……join their

Billy Nees · 01-10-2023, 08:35 AM

Quote:

Originally Posted by Glenn Briglio

Can’t beat them……join their

Glenn, come on! Ya know that some of us are just born Rebels!

Larry Hill · 01-10-2023, 09:05 AM

The Champ lives in Donaldsonville, La. not the place you mentioned. Louisiana does not have counties.

my69396 · 01-10-2023, 01:50 PM

The horsepower differences between sticks and auto's are reflected in the index's. But it was originally to make up for the way auto's and sticks were back in the day. Now with the evolution of auto transmissions I think the sticks are the ones that need the half a tenth. But then I run a stick. You know there is something up with the horsepower when a engine combo that is 75 ci smaller rated at less horsepower in the same class can be 3 tenths and 4 mph faster. Just saying.

01-09-2023, 11:28 AM	#1
442OLDS VIP Member Join Date: Sep 2004 Location: Elgin,IL Posts: 1,339 Likes: 5 Liked 282 Times in 103 Posts	LS1 Horsepower Factors I recently bought a copy of Nitro Joe's Stats on Ebay.(Nice job by the way). I really wasn't aware of some of the horsepower factors in some of the classes I don't compete in. It appears that there is an LS1 in some bodies that is at 381. Then there is a manual transmission combo that is something like 40 horsepower less than the 381 of the same body. Then,if it is in a Corvette,you see 350.But in a Firebird, it's 381 Are these engines all the same or are there differences?

01-09-2023, 12:12 PM	#3
Tar Heel Junior Member Join Date: Oct 2021 Posts: 22 Likes: 0 Liked 21 Times in 7 Posts	Re: LS1 Horsepower Factors How does the GTO fit into that conversation?

01-10-2023, 09:05 AM	#9
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,638 Likes: 1,929 Liked 10,702 Times in 2,228 Posts	Re: LS1 Horsepower Factors The Champ lives in Donaldsonville, La. not the place you mentioned. Louisiana does not have counties. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

01-10-2023, 01:50 PM	#10
my69396 Member Join Date: Feb 2008 Posts: 286 Likes: 0 Liked 43 Times in 19 Posts	Re: LS1 Horsepower Factors The horsepower differences between sticks and auto's are reflected in the index's. But it was originally to make up for the way auto's and sticks were back in the day. Now with the evolution of auto transmissions I think the sticks are the ones that need the half a tenth. But then I run a stick. You know there is something up with the horsepower when a engine combo that is 75 ci smaller rated at less horsepower in the same class can be 3 tenths and 4 mph faster. Just saying.