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12 Injector 3500 Intake

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  • 12 Injector 3500 Intake

    I got rid of my 7th injector set up and will be fabricating a 12 injector intake for my turbo 3500 intake. The stock 6 injectors will remain in the original location and 6 will be mounted in the plenum pointed right at the intake runners. I can keep my SMT6 tuner to control the added injectors, since the SMT6 will support up to a maximum 6 injectors. Pictured is my drilling template I will be using to keep all the holes spaced evenly.

  • #2
    Re: 12 Injector 3500 Intake

    Cool idea, what size injectors do you plan to run?
    08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
    96' Camaro M5 to A4 conversion, alot of mods . GT35R Turbo full suspension. Built engine

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    • #3
      Re: 12 Injector 3500 Intake

      To start I'm leaving the stock 17s in the lower and 24s up top. I also have a set of 48s I bought that I can install up top if needed.

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      • #4
        Re: 12 Injector 3500 Intake

        Drilled out holes and grinded to an oval shape to allow the bungs to go in on an angle.

        Last edited by 3.4grapeofwrath; 12-25-2013, 04:59 AM.

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        • #5
          Re: 12 Injector 3500 Intake

          Here's the bung and injector installed.

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          • #6
            Re: 12 Injector 3500 Intake

            Is this better than getting bigger injectors?

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            • #7
              Re: 12 Injector 3500 Intake

              It has pros and cons. It's much easier to tune, there's no tuning problems with idle and cold start up as with bigger injectors. All I need to tune is for when I am in boost. The stock tune and emissions is still the same, no need to be concerned at inspection time. I can upgrade to larger injectors without removing the plenum. Using larger injectors is less complicated installing and removing and the stock location is better.

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              • #8
                Re: 12 Injector 3500 Intake

                Here's the injectors mounted in the plenum. Next I need to work on the fuel rails.
                I also deleted the egr mount and straightened out the neck of the plenum, which normally turns to the left.

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                • #9
                  Re: 12 Injector 3500 Intake

                  Started drilling the fuel rails with the drilling template. I miss my bridgeport miller at times like this but some times you have to improvise.

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                  • #10
                    Re: 12 Injector 3500 Intake

                    After drilling all the pilot holes I used a pilot counterbore to finish the job.
                    Careful attention to squareness and depth checking when using my dewalt milling machine.
                    Last edited by 3.4grapeofwrath; 12-25-2013, 04:24 AM.

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                    • #11
                      Re: 12 Injector 3500 Intake

                      I'm impress. That's really creative.

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                      • #12
                        Re: 12 Injector 3500 Intake

                        Originally posted by 2.8 Bird View Post
                        I'm impress. That's really creative.
                        Thanks.

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                        • #13
                          Re: 12 Injector 3500 Intake

                          Test fit of the fuel rails. Next will be the mounting posts and fuel line fittings.

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                          • #14
                            Re: 12 Injector 3500 Intake

                            It's close but it fits.

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                            • #15
                              Re: 12 Injector 3500 Intake

                              That's pretty awesome actually- now just replace those top injectors with nitrous jets :stp:

                              2002 SOM Z28 Camaro - 12.9 @ 104 mph
                              1996 3800 Camaro - 13.43 @ 100.77 mph


                              Project Cars | How To Guides | Scratch Repair | Synthetic Oil

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