Hi all a simple question...

I have a 4.9l carby totally stock just an EFI exhaust was installed.

I had the opportunity to upgrade it to a totally stock EFI system BUT I was wondering...

Will produce more power installing one of those special intake manifold AND a Holley 390??? If so... I need info to adjust mechanical advance on my distributor, I'm having some problems...

 

Install a offy dp and a holley 390cfm 4brrl and you should be much happier most say. Keep the efi manifolds if you can though. AS for adjusting the advance on the dizzie no idea all i have is here say. My 300 is efi and i just leave mine alone lol.

 

lots of people claim the EFI engines have more power.
I've towed and hauled alot of weight with several 300 powered trucks all the way up to f600's and would rather have a stock 1bbl setup over a EFI setup any day. The EFI may get a little better milage driving empty around town, but they just don't pack the gear when it comes to really working the truck.

The ONLY thing goood about the EFI setup is the exhaust manifolds.

 

And the fact that in any condition, temperature, altitude-anything, the truck always starts and runs the same. I have owned both, and I say the EFI wins, hands down. No fiddling with anything to make it run right, or start. And I think the efi is definitely more powerful. A lot of engineering went into the fuel injection system on factory rigs, and it shows. They are a huge leap forward, in my opinion.

 

Well, I was evaluating both induction systems, carby and EFI and my guess are:

Carby:
-Still using ventury to work, so always will be a little bit of intake air restriction.
-Carbureter doesn't learn about changes on engine condditions like coolant temp, fuel octane, intake air temp, barometric pressure, etc
- Ignition timing still been a different component with its proper tunning
-Can accept performance modifications with any problem.

EFI
- Provides a fine tune up for every driving conddition, can be fine tuned in real time and stored in memory, so computers "learn" about engine behaviour
- No timing problems since knoking sensor is avaylable and all timeing is controlled by SAME computer
- No matter weather condittions, always start and run fine
- A little bit difficult to diagnose since there are a lot more stuff
- In close loop mode at highways, computer can do a really good fuel milleage with no valve burning or lossing power
- Doesn't stand a lot of performance modifications like cams
- No Idle problems when tranny is in "D" and AC compressor starts

Right now I have installed the stock one barel carby, I'm having a lot of troubles with my distributor tune up since I was unable to obtain the proper timing curve. More over my engine loss a lot of power over 2200 RPM, doesn't produce any torque, I'm tired of perform carby services and tests, same for distributor so I guess I'll try the Stock EFI option.

I just need get the proper the computer, a bit difficult here in Venezuela, if someone knows where can I find one...

Thanks

 

man i recentlyu aquaired a 83 bronco with a stock carbed system and that thing is completly gut less my 87 efi is so much quicker and better on gas hands down ill take efi over carbed but given the right parts they both could have very good potential

 

If you don't plan on trying to make it a decent performance engine then EFI is the way to go.

If you plan on using a lumpy cam along with other mods, then carbed would be the best route due to pre 96 PCM limitations and tuning.

 

Wenll, I don't plan do almost no modifications,an stock EFI will be enoght since here in Venezuela wasn't assembly by Ford trucks using 300 EFI's, then at least; my 300 will be a bit powerfull than all 300's carby here.

Thanks for your comments, what I need now is the F@#!& computer...