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Engine Improvement questions

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RJ7868:
Ladies and Gentlemen,

Over the next few months, hopefully, I will be doing a lot of work under my car. Replacing all the old bushes, upgrading where possible (brakes included LINK) and cleaning up what I can get to in the process.





I have noticed while working on my 84 that whoever changed it from fuel injection to carburetor has just left electrical cables and many hoses going no where. Not sure if any of the electrical still works or even where they would go.

So what I was thinking was, about changing my 84 from a carburetor back to fuel injection. Does not need to be orginal injection, just a system that will make the car GO.

What I would like to know from the Corvette Gurus out there is:
What difference would fuel injection have over what I have ATM (At The Moment)?
What brand injection should I be looking at?
What extra pieces will I be needing? Inlet manifold, electrical, computer, etc

Cameron 77C3:
Whilst C4's are not my field, I know engine mods can be expensive.

Hope ya got a deep pocket RJ. ;46

daniel42au:
You might be up for a few thousand depending on where you source the missing parts such as but not limited to.... air filter and box, connecting air intake, MAF unit, throttle body, plenum, air intake runners, fuel rails, a set of fuel injectors PLUS the labour of someone who is capable of connecting it all up including all the missing sensors and getting it running right again.... thru the on-board Electronic Control Module( ie computer).

hmmmm...  

My suggestion is to get it DYNO'ed and compare it with a standard fuel injected car.... to see how many extra bangs (if anything) your going to get for your bucks.

Fuel economy is another issue.... with a carb, it looks like your missing the various throttle body/MAF  sensors used by the computer to calculate and set the fuel/air mixture of 14.7 to 1 .... and hence maximise fuel efficiency....  what's the fuel economy like with the carby fitted?

My guess is that the ECM is still there... it is integral to the electrics.

As for the fuel injection to install... the easiest would probably be to restore it to standard.... but I am just a mug punter and no expert.

Thunder Kiss:
RJ, "Corvette Fever" or "Vette" magazine (I can't recall which) recently ran a dyno test on an '85-'91 L89 tune port injected motor, then they took off the TPI injection and installed an Edelbrock Performer RPM manifold and 600cfm Carb.
Guess what made more power? The carb set-up!

Your '84 would have originally come with a cross-fire injection system which never made as much power as the later TPI injection. The cross-fire system also worked with low fuel pressure, same as a carby. Later EFI's used higher fuel pressure so any "upgrade" you do to a later EFI set-up will have to start with a new high pressure fuel pump and associated lines.

Yes, an EFI system will be nicer to drive from cold, it may give you better throttle response at cruising rpm, and it may give you better economy but it won’t necessarily give you more power.

To be honest, if I were in your shoes I would stick with the carburetor.

RJ7868:
OK, I think I am convinced. I am going to leave the carburetor where it is but do a HUGE clean up around it. Clean up hoses and electrical cables going no where and removing what I think can be removed.

Try to hide what I can.

Thank you once again for the advice from a Corvette Community of Corvette Gurus.

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