L83 Questions
Thread Starter
4th Gear
Joined: Nov 2007
Posts: 4
Likes: 0
L83 Questions
Hello, I have an 84 CFI c4, now I want to get the most I can out of this car. The engine IS a 350ci engine... so is this possible to build a 383 stroker out of it? And can I switch my CFI to a TPI from a junked vette? Is this all pointless, should I just sell it and buy a later year? I figure I can't just trade it as it is worth a little less than a later year. Idk, can anyone update me on this?
Thanks guys.
Thanks guys.
Racer
Joined: May 2006
Posts: 426
Likes: 16
From: Concord CA
No reason why not to go to 383.. but you will leave a lot on the table if you use the CFI or TPI.. Don't know too much about the CFI.. but the stock TPI will run out of air around 4500-5000 RPM.. you will need to go to a Mini Ram or Ported TPI or Super Ram.
Are you worried about Smog laws ?
Might be cheaper to sell and upgrade...
Are you worried about Smog laws ?
Might be cheaper to sell and upgrade...
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Hello, I have an 84 CFI c4, now I want to get the most I can out of this car. The engine IS a 350ci engine... so is this possible to build a 383 stroker out of it? And can I switch my CFI to a TPI from a junked vette? Is this all pointless, should I just sell it and buy a later year? I figure I can't just trade it as it is worth a little less than a later year. Idk, can anyone update me on this?
Thanks guys.
Thanks guys.
Your real answer is going to come down to your budget and goals. I'm not sure how much I'd invest in an '84 car, but then again if the body and interior is mint it's probably worth it.
-- Joe
Burning Brakes
Joined: Sep 2006
Posts: 1,202
Likes: 3
From: MD
Switching it to a TPI is pointless. The cost/hassle do not outweigh the benefits. You can make a CFI car into a very good driver with plenty of power without breaking the bank. CFI will tell ya, and you should also check out this site:
http://crossfire.home-ip.net
Personally I wouldn't go 383 unless you really want to or the motor needs rebuilding. For a few hundred bucks and some time the stock CFI motor can be made to perform quite well. Port the intake, change the fuel pump to steady the pressure, rebuild the TBs (depending on how many miels are on them), change the exhaust, 1.6 rockers, and gears. Maybe $1k at the most in those mods, and it'll be faster than a stock TPI vette (flame suit on for that one).
http://crossfire.home-ip.net
Personally I wouldn't go 383 unless you really want to or the motor needs rebuilding. For a few hundred bucks and some time the stock CFI motor can be made to perform quite well. Port the intake, change the fuel pump to steady the pressure, rebuild the TBs (depending on how many miels are on them), change the exhaust, 1.6 rockers, and gears. Maybe $1k at the most in those mods, and it'll be faster than a stock TPI vette (flame suit on for that one).
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Definetly check out the crossfire website that Jleatherman suggested. There is a ton of info there for the CFI's.
Also if you do a search here you will find a lot the threads on a CFI to TPI conversion( more of a debate
). Switching to TPI is not a simple thing if you feel that is a must have. There is plenty to do with what you got already, just do some research and you'll see.
Also if you do a search here you will find a lot the threads on a CFI to TPI conversion( more of a debate
). Switching to TPI is not a simple thing if you feel that is a must have. There is plenty to do with what you got already, just do some research and you'll see.
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by JLeatherman
Switching it to a TPI is pointless. The cost/hassle do not outweigh the benefits.
Especially since the benefits are negligible. If you can't satisfy your performance needs with a modified CFI, then you need a different EFI system, but not the restrictive TPI.
Originally Posted by JLeatherman
For a few hundred bucks and some time the stock CFI motor can be made to perform quite well. Port the intake, change the fuel pump to steady the pressure, rebuild the TBs (depending on how many miels are on them), change the exhaust, 1.6 rockers, and gears. Maybe $1k at the most in those mods, and it'll be faster than a stock TPI vette (flame suit on for that one).
Except for the fuel pump. As long as the stock pump can keep up, there is nothing to be gained by more fuel bypassing in the fuel pressure regulator.
Originally Posted by 856SPEED
The runners/ports on an L83 intake are very small diameter limiting air flow. A 383 will be choked and converting to TPI is costly with modest gains at best.
I have about $1300.00 invested in mine, and almost $900.00 of that is the Vigilanti torque converter.
RACE ON!!!
