Anybody running an SP3 with a Quadrajet?

Discussion in 'Small Block Tech' started by Skippy597, Jan 10, 2018 at 3:02 PM.

  1. 8ad-f85

    8ad-f85 Well-Known Member

    Thanks for having a sense of humor, it isn't always taken as lightly :D
    I choose more based on a time vs. $$ thing, as in "who is paying and for what?"
    It makes sense for me to have them start off with something close, so Holley DP.
    For sleepers I've had or daily driven rods, the GM carb, power level notwithstanding.
    Sometimes it depends on what fits the intake or car, whether there's room for a spacer, how much fussing, etc.
    Now most of my GM cores need throttle shaft work and more, so they will sit until I decide the time is worth it.
    Kind of wish I hadn't gotten rid of the barrels of Q's I had in the mid 90's when nobody wanted them (would pay, lol).

    There's enough info in this thread for you to have an idea of what the Q will take to work, and where to look for more info.
     
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  2. Skippy597

    Skippy597 Silver Level contributor

    Absolutely, any input is always welcomed. This thread has been a major help as has this forum as a whole. I'm always looking for some further edu-ma-cation and am willing to admit I am no where near a guru on these subjects, I'm quite further down the chain, like the anchor.
     
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  3. Mark Demko

    Mark Demko Well-Known Member

    DONT RUN VAC SECONDARY:mad:
    I ran a Holley 750 vacuum secondary for years its ok, but for performance, THEY SUCK!
    For example, when I was running the Stage 1 intake with the Holley 750 V/S I couldn't get outta the 15's, put my awesome Q-Jet on from Everyday Performance I went from 15.01 to a 14.78 in the 1/4 mile................ no other changes:D
     
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  4. Skippy597

    Skippy597 Silver Level contributor

    Perfect, that's he type of input I was looking for. Thanks
     
  5. 8ad-f85

    8ad-f85 Well-Known Member

    I think everyone has said that 'Out Of The Box' Holley 750 vac sec's would need more than casual adjustment, just like the Q jet.
    The main body had some changes made in the 70's? that require serious mods to act fully like their earlier versions.
    This should speak volumes about any custom carb... of course a customized Qjet is going to work better OOTB than a generic carb.
    That's EXACTLY what you are buying.
     
    Last edited: Jan 13, 2018 at 12:07 PM
  6. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    My vote is a 750 double pumper
     
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  7. 300sbb_overkill

    300sbb_overkill Well-Known Member

    My vote is a FiTech fuel injection that you won't have to worry about tuning because it is self learning/self tuning.

    http://fitechefi.com/
     
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  8. Skippy597

    Skippy597 Silver Level contributor

    Well, yes I would have to agree. But with the cost being significantly more and then having to spend more money modifying my fuel system it's not really on the radar at least for now. I've really been eyeing the Holley sniper kit and after struggling with my current carb it's definitely a strong temptation. But people still have issues with them as well, so nothing is without flaws.
     
  9. gsjohnny1

    gsjohnny1 Well-Known Member

    you are right grasshopper about outside the box. main idea was to save the aggravation of going thru the q/jet process as we have proven the d/p is the best method for the s/p, not the q/jet.
    beating with 40 q/jet metering rods due.
     
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  10. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    At least the double pumper carb won’t leave you on the side of the road trying to talk to non existent customer support from Fitech.... in 10 years from now how many Fitech equipped vehicles will be on the road? I bet very little.
     
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  11. 300sbb_overkill

    300sbb_overkill Well-Known Member

    So that costs right around $100 for trouble free driving a year, by then he probably would want to swap the Mr. Fusion kit on the engine anyway?
     
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  12. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    Sorry but I am not sold on the low cost EFI solutions....
     
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  13. gsjohnny1

    gsjohnny1 Well-Known Member

    still can't figure out how to make it work on the dragster and zoomies........
     
  14. Swagon

    Swagon Well-Known Member

    Im personally going from atomic efi which is similar to fitech back to a 750 holley. I've had to many issues just trying to get it to run good enough. And I talked to a guy from haltech and he said the TBI style injection doesn't atomize as well as a carb, and if you do use use its really for your stock-ultra mild cruiser. He also wen on to say if you dont use a multi port injection that its just a waste of money and should stay carb'd the engine will be way happier.
     
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  15. stk3171

    stk3171 Well-Known Member

    I run one on drag car. Bone stock 350 8 inch converter 4.88 gear.
    Dan
     
  16. 300sbb_overkill

    300sbb_overkill Well-Known Member

    Its simple, just bolt in on, wire it per the directions, add the O2 sensor in your exhaust and run a fuel pump with enough fuel pressure and a return line and good to go. You will probably need the power adder unit with your setup?

    I have no clue who "haltech" is and why a guy from there would say such things? I think you're a bit confused as well because its the multi-port EFI that doesn't atomize as good as a carburetor, not the throttle body injection. The throttle body injection atomizes just as good as a carb, probably even better because of how the injectors can mist the fuel better than a carb can in the same position in the intake tract as a carb so just as good or better atomization than a carb.

    The multi-port injection feeds fuel further down the intake tract giving it less time for the fuel to atomize than a carb or throttle body fuel injection.

    A friend of mine that I built solid roller Dart headed all forged internals sbc 383 that will spin to 8,500 RPM if the rev limiter is raised up(set to 7,500 now), runs a FAST EZ EFI that runs flawlessly. Drives that thing in the Silver Lake Sand Dunes and basically keeps that thing around 7,000 RPM in second and third for hours at a time without a hiccup.

    That Atomic EFI must be a turd compared to the FAST EZ EFI. The FiTech actually has more features than the FAST unit, I personally have no experience with the FiTech unit but all the reviews I have read are no where close to what you're describing for that Atomic turd setup. A lot more radical engines than yours are running the FiTech unit without any issues.(their fuel command center is a different story though, so I would have to say stay away from that)

    If you think you need multi-port FI, FiTech makes those now. You would have to ask them if they can make one for a Buick engine though of coarse that isn't listed!:rolleyes:
     
  17. gsjohnny1

    gsjohnny1 Well-Known Member

    dan,
    explain the 4:88's to this group. don't think they understand how hard it is to run nhra stk with nothing and still be competetive
     
  18. Skippy597

    Skippy597 Silver Level contributor

    What times are you running with it?
     
  19. Gary Bohannon

    Gary Bohannon Well-Known Member

    So much fun...
    when your old 67 Buick rus a 7.5 sec 1/8 mile at 92 mph and they peep under your hood only to see a quadrajet carb, Buick (350) air cleaner with the lid on and a small dirty filter inside. Also power steering, power brakes, stock fan and clutch, fuel pump in stock location, stock Buick ralley wheels, black vinyl top, stock full interior and a Buick tach, etc.
    However, B4B is painted red, stage 2 heads are red, air cleaner has sneaky cold air into the firewall, and an innocent looking Quadrajet that shoots 2 streams out back just like a Holley double pumper. Then you start the engine and the 36 year old c118 cam idles like a stock engine. Remove the oil cap and show them the stock rocker arms...(hidden deep inside, stock 1970 Buick pistons with cheap cast iron rings).
    But the big secret,... the q-jet shoots fuel out back just like a Holley!
     
  20. stk3171

    stk3171 Well-Known Member

    GS Johnny
    This is my test mule 74 Apollo hatchback used for testing combinations for the NHRA car. Run 4.88 s because I could not find used 4.56 at the time. plus the old motor is the original 350 with 100,000 miles on the odo. I shift it at 5500 . Amazing old motor . Love these reliable old Buicks. You would think it would just give up. Ben testin the spare metrick 200 and it is workin fine.
    T SP3 intake works fine on this combo with Qjet but it is slower than the stock intake with no big cam to help it out. A big cam should wake it up. May try one of the old stocker cams in it this year.

    Dan
     

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