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Carb or EFI

Discussion in 'Engines and Drivelines' started by Jeff Miller, Mar 25, 2021.

  1. Jeff Miller

    Jeff Miller
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    So I got a new motor last fall. A383 stroker with all forged internals. Right now it has dual Edelbrock 600 cfm carbs on top of a 6-71 blower. If money was no object would it be better to go with Holley EFI? Would it be more responsive? Would it be better for the engine overall?

    Thanks
     
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  2. Spanky

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    I know some die hard tunnel ram fans that swear they have tuned theirs to give instant throttle response, but . . . in the big scheme of things, the EFI is going to give the consistent "no-need-to-fiddle-with-it" response every time, and better MPG to boot.
     
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  3. old round fart

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    I’m dreaming about Holley EFI for my blower motor.
     
  4. Neshkoro

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    Two EFI setups, $2,000 plus! About twice the cost of a couple of Holley carbs. How deep are your pockets?
     
  5. old round fart

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    That’s just the beginning! Now you need fuel pump 2 filters distributer (to let EFI control timing). All in about $3000 for me with a trans. Control for my 4l80E. I’m about half way there with my “Christmas present “ from Me to Me!! Lol
     
  6. Jeff Miller

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    Ya, I figured around $2700. I have a MSD ignition. Does it really need to control the timing if I have it set properly to begin with?
     
  7. old round fart

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    Detonation with boost and crap gas is a real possibility. For what it cost to install verses what it cost to repair it seems like a no brainer to me. When you spend $2700 another $300 seems insignificant in the grand scheme of things. Just my opinion.
     
  8. Jeff Miller

    Jeff Miller
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    Makes sense to me.
     
  9. Jeff Miller

    Jeff Miller
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    So if you are running zoomies, do you just use one pipe for the oxygen censor?
     
  10. old round fart

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    Info would be marginal. I think I would check Holley Tech line.
     
  11. Island Girl

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    Since fuel injection is most advantageous where the climate is always changing, and often cold, so you always get instant starts and smooth off-idle acceleration under all conditions, . . . . .it's kinda antithetical to running a roots blower that's always finicky as hell when it's cold, and problematic until you've built some heat in the engine.

    I'd just stay with the carbs and tune them to your most common weather when you drive the car the most and save the $$$.

    ORF is dead on about boost and crap gas . . .
    I'd be sure to get a boost retard module if your MSD doesn't have it built in so the timing will automatically back out as boost comes up.

    Just an old lady's 2 cents . . . . .
     
  12. 409T

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    Yep. I wouldn't give up on a blower with two 600 cfm carbs. They may need to be 1405's however.
     
    #12 409T, Mar 26, 2021
    Last edited: Mar 26, 2021
  13. old round fart

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    I had 2 AFB’s I think were 500 cfm if I remember right on a 350 and blower driven 20% over and never had a problem in 10 years and about 100,000 miles. I never could keep my foot in it long enough to run out of air I guess.
     
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  14. Gerry

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    After a chat with kinsler I run just one sensor in the pipe from #1 cylinder. Its positioned a long way from the head but I was told as long as there is no 'backwash' of air it should be OK. Not sure how you stop a false signal with short headers from 'clean' air being pulled back into the pipe.

    I made the cover to tidy it up. Remember the sensor also gets a signal from the air on the outside as well as in the pipe.

    o2 sensor cover (2) [640x480] (2015_11_13 11_07_31 UTC).JPG


    o2 sensor2 (10) [640x480] (2015_11_13 11_07_31 UTC).JPG
     
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  15. old round fart

    old round fart
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    That is frickin cool!
     
  16. Island Girl

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    But coming from Gerry, how could we expect anything less . . . . :D
     
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  17. old round fart

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    Absolutely not! His stuff always leaves me feeling so inadequate.
     
  18. Gerry

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    Im no better than most. Just make it shiny to take the eye off the errors.

    Found the pic of it I was looking for.

    on pipe2.JPG
     
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  19. Jeff Miller

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    Ok so I decided to go with 2 of these. They are supposed to be set-up for a roots style blower. They are 650 cfm.
    Q-SERIES CARBURETOR 650CFM DRAW-THRU 2X4 SUPERCHARGER
    -4150
    [​IMG]
     
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  20. Spanky

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    Those should certainly get the job done! If you're not an expert (which I am not either) it might be wise to find a good carb guy/shop to help you tune them once they're installed. When set up properly, they should make that stroked small block a real snappy performer. :D:thumbsup:
     
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