How much horsepower does my car have at the CRANK with the current modifications?
02-20-2006, 07:45 PM
#1
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How much horsepower does my car have at the CRANK with the current modifications? Also, as mentioned before, I might buy some Edelbrock shorty headers for $165. What gain would I see now that I have a Borla catback on the car. Thanks. 
02-20-2006, 07:56 PM
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Originally Posted by infinitebird
headers are usually good for around 20-30.
02-20-2006, 08:39 PM
#4
Originally Posted by Shackleford
I think the K&N CAI is good for like 15 horses, and the Borla catback is probably good for 20-25?
There is no way a cat back system gives as much HP as headers.
02-20-2006, 08:44 PM
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Originally Posted by blind527
There is no way a cat back system gives as much HP as headers.
02-20-2006, 08:53 PM
#7
Originally Posted by Shackleford
Then what are the rough gains for the K&N CAI, Borla catback, and Edelbrock SHORTY headers?
I would say:
20 for the headers
10-15 for the CAI
5-15 for the catback *depending on application*
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02-20-2006, 08:56 PM
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Originally Posted by blind527
I would say:
20 for the headers
10-15 for the CAI
5-15 for the catback *depending on application*
20 for the headers
10-15 for the CAI
5-15 for the catback *depending on application*
02-20-2006, 09:40 PM
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A) Who cares what you make at the crank, its at the wheels that matters
B) Don't buy shorties
C) I estimate about 270-280 to the wheels after headers(if you go with shorties)
B) Don't buy shorties
C) I estimate about 270-280 to the wheels after headers(if you go with shorties)
02-21-2006, 12:13 AM
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Originally Posted by Cammed95Z28
A) Who cares what you make at the crank, its at the wheels that matters
B) Don't buy shorties
C) I estimate about 270-280 to the wheels after headers(if you go with shorties)
B) Don't buy shorties
C) I estimate about 270-280 to the wheels after headers(if you go with shorties)
02-21-2006, 01:26 AM
#12
Shorties are barely worth putting on. These motors need long tubes to breath well above 4500-5000.
I don't think you can count on shorties for more than 10-15HP. I've had 3 sets of shorties and 4 sets of LTs and 1 set of Sanderson cast iron manifolds. The shorties never performed in the same class as the LTs.
Skip the shorty stage and go directly to full headers into an efficient catback. You'll never look back.
Jim
I don't think you can count on shorties for more than 10-15HP. I've had 3 sets of shorties and 4 sets of LTs and 1 set of Sanderson cast iron manifolds. The shorties never performed in the same class as the LTs.
Skip the shorty stage and go directly to full headers into an efficient catback. You'll never look back.
Jim
02-21-2006, 01:31 AM
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Originally Posted by DeltaT
Shorties are barely worth putting on. These motors need long tubes to breath well above 4500-5000.
I don't think you can count on shorties for more than 10-15HP. I've had 3 sets of shorties and 4 sets of LTs and 1 set of Sanderson cast iron manifolds. The shorties never performed in the same class as the LTs.
Skip the shorty stage and go directly to full headers into an efficient catback. You'll never look back.
Jim
I don't think you can count on shorties for more than 10-15HP. I've had 3 sets of shorties and 4 sets of LTs and 1 set of Sanderson cast iron manifolds. The shorties never performed in the same class as the LTs.
Skip the shorty stage and go directly to full headers into an efficient catback. You'll never look back.
Jim
02-21-2006, 05:53 AM
#14
There's this thing called the Law of Diminishing Returns. Here's how it goes:
When one of the factors of production is held fixed in supply, successive additions of the other factors will lead to an increase in returns up to a point, but beyond this point returns will diminish.
http://www.cr1.dircon.co.uk/TB/2/dreturns.htm
The HP gains that various manufacturers claim their product will produce are all based on the engine being completely stock. In other words, if you're looking at a catback exhaust system from so-and-so manufacturer, and so-and-so says that their exhaust will produce 15 more RWHP, BUT you've already got a set of headers and a CAI, that 15RWHP is just about cut in half because the Law of Diminishing Returns is already in effect. It's not as simple as just taking all the HP gains each manufacturer promises and adding them all together, then adding that number to your stock HP number.
Realistically, with a CAI, shorties, and a catback, you'e looking at gaining 30-35FWHP. With a good tune add about another 10 on top of that.
When one of the factors of production is held fixed in supply, successive additions of the other factors will lead to an increase in returns up to a point, but beyond this point returns will diminish.
http://www.cr1.dircon.co.uk/TB/2/dreturns.htm
The HP gains that various manufacturers claim their product will produce are all based on the engine being completely stock. In other words, if you're looking at a catback exhaust system from so-and-so manufacturer, and so-and-so says that their exhaust will produce 15 more RWHP, BUT you've already got a set of headers and a CAI, that 15RWHP is just about cut in half because the Law of Diminishing Returns is already in effect. It's not as simple as just taking all the HP gains each manufacturer promises and adding them all together, then adding that number to your stock HP number.
Realistically, with a CAI, shorties, and a catback, you'e looking at gaining 30-35FWHP. With a good tune add about another 10 on top of that.
02-21-2006, 12:15 PM
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Originally Posted by Shackleford
What does it matter what's at the crank? The two are intrinsically related. Of course, there's a rough generic percentage of drivetrain loss. It's what's at the crank that matters; it's what's at the wheels that matters.
02-21-2006, 12:19 PM
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Originally Posted by Cammed95Z28
I was just simply stating that i think RWHP numbers are much more important... Especially in your case because you lose more to the wheels than a M6 would, therefore you should be more concerned with RWHP than FWHP. Horsepower at the crank is a number used to sell cars. JMHO
02-21-2006, 05:11 PM
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Originally Posted by blind527
I would say:
20 for the headers
10-15 for the CAI
5-15 for the catback *depending on application*
20 for the headers
10-15 for the CAI
5-15 for the catback *depending on application*
02-21-2006, 05:16 PM
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Originally Posted by Renegade
He is probably just about right on, but I think you might only see 15 from the headers, considering they are shortys and our cars see bigger gains from Longtubes. You will probably be pushing around 315-320 at the flywheel.