Cfi 300 Hp ?
Thread Starter
Intermediate
Joined: Jun 2006
Posts: 25
Likes: 0
From: Miami Florida
Cfi 300 Hp ?
Hello to all,
I am the proud owner of an 84 vette, and Say what you will I really like the crossfire induction system...
I have read that it is posible to get a CFI engine above 300 ponies; while keeping it stock.... Is it true??? and if so how?
I am the proud owner of an 84 vette, and Say what you will I really like the crossfire induction system...
I have read that it is posible to get a CFI engine above 300 ponies; while keeping it stock.... Is it true??? and if so how?
Burning Brakes
Joined: May 2000
Posts: 1,243
Likes: 1
From: Charlotte, NC USA
Originally Posted by Zero Limits
Hello to all,
I am the proud owner of an 84 vette, and Say what you will I really like the crossfire induction system...
I have read that it is posible to get a CFI engine above 300 ponies; while keeping it stock.... Is it true??? and if so how?
I am the proud owner of an 84 vette, and Say what you will I really like the crossfire induction system...
I have read that it is posible to get a CFI engine above 300 ponies; while keeping it stock.... Is it true??? and if so how?
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
I have been pursueing that same things lately. Under my corvette photos you can find my dyno results on my 84 with my mods. I am in the process now of making a few more changes. My goal has been 300rwhp. Is it possible? I think so
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
thanks but thats actually 207.7 at the wheels. Using about a 22% loss over the valve train my engine should be making around 260. A stock 84 at the wheels is closer to 140 or so,engine rated at 205. So I figure I picked up only about 50-60 hp with the mods (listed in profile). I think the only way to get up to the 300 mark is you will need a cam, gears. Thats what I'm working on now. Trying to figure out which one to use.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Valve train? That had better not take any power! I think you meant Drive Train?
As for the Xfire, Alcee1 has proven it can be done. Bored TBs, bored intake manifold, Edelbrock heads, highflow cat and a few other tricks.
As for the Xfire, Alcee1 has proven it can be done. Bored TBs, bored intake manifold, Edelbrock heads, highflow cat and a few other tricks.
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Originally Posted by bogus
Valve train? That had better not take any power! I think you meant Drive Train?
As for the Xfire, Alcee1 has proven it can be done. Bored TBs, bored intake manifold, Edelbrock heads, highflow cat and a few other tricks.
As for the Xfire, Alcee1 has proven it can be done. Bored TBs, bored intake manifold, Edelbrock heads, highflow cat and a few other tricks.
. LOL... wasn't thinking when I typed that, trying to do two things at once. Thanks for clearing that up
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by qws
. LOL... wasn't thinking when I typed that, trying to do two things at once. Thanks for clearing that up
Then again, reciprocating mass will cost a little power, but not as much as the transmission!!! If it does, I think there is a little problem...
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by Zero Limits
I have read that it is posible to get a CFI engine above 300 ponies; while keeping it stock.... Is it true??? and if so how?
Originally Posted by bogus
Valve train? That had better not take any power! I think you meant Drive Train?
Originally Posted by bogus
As for the Xfire, Alcee1 has proven it can be done. Bored TBs, bored intake manifold, Edelbrock heads, highflow cat and a few other tricks.
Originally Posted by bogus
Then again, reciprocating mass will cost a little power,
RACE ON!!!
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by CFI-EFI
Considering that it came from the factory with 290 horsepower, 300 shouldn't take much.
Talk about your nit pickers and those that jump on a typo...
"Reciprocating mass"???
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by Zero Limits
I have read that it is posible to get a CFI engine above 300 ponies; while keeping it stock.... Is it true???
You're going to have to change something (probably a LOT of somethings) to get power like that out of the old girl...and then it wouldn't be stock.
300hp can be done, with a judicious choice of parts and the wise use of the checkbook.
Good luck!
Larry
code5coupe
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Knowing what I know now. The first thing I would consider is either porting your intake yourself to save money or you could go the route of the x-ram. I did the second of the two. EITHER ONE will allow more flow.Then think about a set of headers,gears? These mods alone should give you some pretty good results. You could also cut out in your radiator shroud to allow more air to get into your duct work in the hood. Its a free mod except for the couple of bucks spent on the weatherstripping.
Race Director
Joined: Dec 2002
Posts: 13,348
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Wisest use of available funds, in my opinion, would be nitrous. A mild setup (100shot?) will get you close to your goal.
Otherwise, you are looking at cam, heads, intake, and headers at the very least.
Horsepower (real horsepower, not advertised horsepower) is not cheap...my own formula is that you'll spend about $50 for each horsepower you gain....and it adds up quickly.
Larry
code5coupe
Otherwise, you are looking at cam, heads, intake, and headers at the very least.
Horsepower (real horsepower, not advertised horsepower) is not cheap...my own formula is that you'll spend about $50 for each horsepower you gain....and it adds up quickly.
Larry
code5coupe
Last edited by rocco16; Jun 14, 2006 at 03:57 PM.
Thread Starter
Intermediate
Joined: Jun 2006
Posts: 25
Likes: 0
From: Miami Florida
Porting the intake ?
Is that like boring the throttle body or is that somthing else ?
I found a how to of sorts for the throttle body..
http://www.swko.net/~lionsden/crossfire.htm
reccomended or not ????
Is that like boring the throttle body or is that somthing else ?
I found a how to of sorts for the throttle body..
http://www.swko.net/~lionsden/crossfire.htm
reccomended or not ????
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
the internal runners on a stock L83 intake are really small... about 1/2 the size of what they COULD be.
Opening them up is worth serious power.
Also, there is a company that makes an aftermarket aluminum intake for the xfire. It's a modified 4bbl intake that accepts the dual TBs.
Opening them up is worth serious power.
Also, there is a company that makes an aftermarket aluminum intake for the xfire. It's a modified 4bbl intake that accepts the dual TBs.
Racer
Joined: May 2006
Posts: 286
Likes: 0
From: Alpine California
Originally Posted by bogus
Valve train? That had better not take any power! I think you meant Drive Train?
As for the Xfire, Alcee1 has proven it can be done. Bored TBs, bored intake manifold, Edelbrock heads, highflow cat and a few other tricks.
As for the Xfire, Alcee1 has proven it can be done. Bored TBs, bored intake manifold, Edelbrock heads, highflow cat and a few other tricks.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by Blownfuel1
Well actually, being that it is a stock 84 motor, there are quite a few frictional losses in the valve train (no roller cam, standard rockers, etc...but I know you already know this by your later post.)
David Vizzard's Book goes into a lot greater detail on this. Personally, I belive all his books (and Lingerfelter's, Smokey Yunick's, and a few others) should be required reading for someone new to modifying engines
Racer
Joined: Sep 2004
Posts: 317
Likes: 1
From: 84 Blue A4 Garrison Ky
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by bogus
uh, 290? I think that would be the torque rating, the HP is 205. Are you quizing me here?
Originally Posted by bogus
The pot calling the kettle black.
RACE ON!!!