TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

cfi to carb,what is needed ,comp change ,fuel pump,or is it a wiring nightmare????

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Old 01-24-2011 | 10:00 AM
  #1  
moondog1h's Avatar
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Joined: Jan 2011
Posts: 3
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Car: 83 z28
Engine: 305 cfi
Transmission: 700r4
cfi to carb,what is needed ,comp change ,fuel pump,or is it a wiring nightmare????

want to go to a carb on my 83z28 w/cfi,lot more comfortable for me in regards to later repairs ,is it a total night mare or a semi simple swap,not trying to build a 305 hot rod ,just dont like all the electronics and etc.,any help or info would be great ,thanks doug
Old 01-24-2011 | 07:19 PM
  #2  
8t2 z-chev's Avatar
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Joined: Jan 2009
Posts: 2,234
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From: belle fourche,s.d.
Car: '82 z28
Engine: L83 5.7
Transmission: 700r4-1985
Axle/Gears: 3.42 posi
Re: cfi to carb,what is needed ,comp change ,fuel pump,or is it a wiring nightmare???

if you are planning to keep the car mostly stock,i'd
keep the CFI-more reliable than a carb setup,
original,and greater"cool"factor just to mention a
couple advantages
My z28 was originally carb,but i swapped it over to
CFI-swapped back and forth between carb and CFI
a few times untill i had the CFI running and modified
how i liked;when i had my C/F manifold off for a
modification/porting operation i just clapped a q-jet
on in the meantime-was easy,just installed the q-jet
and intake manifold along with a vacume advance
HEI and ran it non-computer.The c/f fuel pump is
a turbine style,so fuel can pull through it easily with
the pump inactive-i just ran a seperate engine mount
pump when using the carb.
pretty much had my C/F how i liked since 1995 and
it has been extremely reliable ever since
Old 01-25-2011 | 10:17 PM
  #3  
gheatly's Avatar
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Joined: Jun 2006
Posts: 181
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From: Dallas, TX
Car: 1982 Z-28
Engine: 5.7L Crossfire
Transmission: TH-350
Axle/Gears: GM Posi, 3.73
Re: cfi to carb,what is needed ,comp change ,fuel pump,or is it a wiring nightmare???

I would recommend keeping the CFI as well. It is really not that complicated. You need to buy the GM shop manual. Very good discussions of how system works and how to trouble shoot.

If you are leaving engine roughly stock, I think it would perform much better with fuel injection. I understand you wanting to swap out the carb though. I thought about it a few times myself.
Old 01-26-2011 | 08:02 AM
  #4  
moondog1h's Avatar
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Joined: Jan 2011
Posts: 3
Likes: 0
Car: 83 z28
Engine: 305 cfi
Transmission: 700r4
Re: cfi to carb,what is needed ,comp change ,fuel pump,or is it a wiring nightmare???

i got irunnin yest,with the cfi on it ,it runs rough ,i put in plugs,needs wires, and the basics,it ran good for a bit then acts as if missin,lots of white smoke but no water in oil ,and no sweetness in exhaust ,so i dont beleive thats an issue,has been sittin a bit,any suggestions on bad sensors etc.,would be great,it seems to want to run good,but possibly a sensor bad,who knows right,i got it for the cfi i think it looks cool,im an old schol guy so i got to get used to it ,but any help or suggestions would be cool,thx doug
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