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aftermarket fuel injection...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rjfguitar, Jul 22, 2003.

  1. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I need some opionions on the aftermarket fuel injection kits available. I have a performance built 406small block with an edelbrock performer Q-jet. I am looking at the holley commander multi point and TBI systems.Is the multi point a lot better than the TBI ( worth the extra 700 somthing bucks)?What about the edelbrock multi point system
    compared to the holley system? I know that the edelbrock system has the little key pad monitor thing to contol the system and that sounds very conveinient. Is my edelbrock Q-jet a terd and should I just get a better carburetor?Thanks for any help. /forums/images/graemlins/thinking.gif

    85K5 3/4ton,14bolt,10bolt,9"lift,35"boggers,16.5x14welds, big horse 406SBC/700r4 /forums/images/graemlins/k5.gif
     
  2. SUBFAN

    SUBFAN 1/2 ton status

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    Go for a system that uses a MAF sensor and not the MAP....

    Look for sequential fuel injection, not batch fire....

    The above two things will help steer you towards a quality system.
     
  3. fad2blk99

    fad2blk99 1/2 ton status

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    I like accel DFI (a multi point system)... just be ready to drop around 3G's.
    My theory on fuel injection (which I LOVE!!!) is don't do do it unless you can go all the way. That is, given your 406ci set-up, I would strictly go with hi CFM multi piont set-up. If you can't do that, get a good carb and save 'til you can.
    I have to tell you though, I don't know anyone running the aftermarket EFI, so I haven't seen any of this in person. From what I've read in mags (CHP, Car Carft) the Accel DFI w/ CalMap 2 software is king....
     
  4. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Thanks guys, I've heard of accel and that they are very good also, I will check them out some more. I deffinently need a lot of cfm, I'm thinking around 1,000cfm throttle body.
     
  5. Sandman

    Sandman 3/4 ton status Author

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    I bet if you calculate it out, You would be surprised at how much CFM you really need. I acutally gained 22 Horses at the rear wheels of my Chevelle switching from a 750 CFM to a 650 CFM. The motor is far from stock also. I have a 900 CFM Holley system on the Built 454 in my Blazer and I am constantly leaning down the fuel map to get it to run decent. Its just too much CFM for it. I have considered going to a smaller unit so its easier to tune.
     
  6. fad2blk99

    fad2blk99 1/2 ton status

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    Fuel injection can control the air/fuel mixture unlike carbs...
     
  7. Sandman

    Sandman 3/4 ton status Author

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    Fuel injection does it with a computer, Carburators do it with rod and jet changes. Call up Holley or Edelbrock and talk to thier techs. They would give you the strait story.
     

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