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  • Methanol injection

    I got my methanol injection installed and took the car for a test drive. http://www.alkycontrol.com/ I got it dialed in so i could start cranking up the boost and discovered had an ignition problem( a lot of breaking up and back firing ) boosting any thing over 10lbs. I ordered a new coil thinking that is the problem. When i installed the turbo i replaced the cap, rotor, coil wire, spark plug wires, and spark plugs. What else could the problem be?
    Black 1986 300zx Turbo coupe (Chuki)
    http://z31performance.com/showthread...86-Turbo-Coupe
    ----------------------------------------------------------------------------------------------------------------
    Pewter 1986 300zx N/A 2 Turbo 2+2 (Chuki)
    http://z31performance.com/showthread...9;s-1986-300zx

  • #2
    How much plug gap are you running?

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    • #3
      plug gap needs to be brought down to about 30mm -35mm.

      make sure that your not spraying too much with the methanol injection.

      plus, spraying at just 10lbs of boost will net a loss in power when compared to not using it all.
      [strike:ff0tp92h]1984 300ZXT[/strike:ff0tp92h]
      [strike:ff0tp92h]1986 300ZX 2x2 NA2T[/strike:ff0tp92h]
      2000 Porsche Boxster
      2007 Toyota Yaris

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      • #4
        methanol injection

        The lower side of factory specks. I have heard of problems because of to much gap so i set them to the lower setting.
        Black 1986 300zx Turbo coupe (Chuki)
        http://z31performance.com/showthread...86-Turbo-Coupe
        ----------------------------------------------------------------------------------------------------------------
        Pewter 1986 300zx N/A 2 Turbo 2+2 (Chuki)
        http://z31performance.com/showthread...9;s-1986-300zx

        Comment


        • #5
          .030" plug gap
          85 Z31 6.0 LSX turbo 766whp/792wtq
          04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

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          • #6
            z

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            • #7
              bemis wrote: plug gap needs to be brought down to about 30mm -35mm.

              make sure that your not spraying too much with the methanol injection.

              plus, spraying at just 10lbs of boost will net a loss in power when compared to not using it all.
              Yes it will. I have to with no intercooler. I checked my plug gap, they are set at .040
              Black 1986 300zx Turbo coupe (Chuki)
              http://z31performance.com/showthread...86-Turbo-Coupe
              ----------------------------------------------------------------------------------------------------------------
              Pewter 1986 300zx N/A 2 Turbo 2+2 (Chuki)
              http://z31performance.com/showthread...9;s-1986-300zx

              Comment


              • #8
                You could even go as low as .028" (That's what I run)!

                bemis wrote: plug gap needs to be brought down to about 30mm -35mm
                You do realize that this is around 1.5 inches of gap!!! :wink:

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                • #9
                  Haha I'm sure he means decimal point :P
                  http://youtube.com/c/zcartube

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                  • #10
                    Some info; stock computer, stock injectors, walbro 255, I went out in the country and did some long boosting and tuning I think i found the problem 9.95:1AFR when the missing starts :shock: Why is my AFR getting so rich as i raise boost without the meth?
                    Black 1986 300zx Turbo coupe (Chuki)
                    http://z31performance.com/showthread...86-Turbo-Coupe
                    ----------------------------------------------------------------------------------------------------------------
                    Pewter 1986 300zx N/A 2 Turbo 2+2 (Chuki)
                    http://z31performance.com/showthread...9;s-1986-300zx

                    Comment


                    • #11
                      Crazy wrote: Some info; stock computer, stock injectors, walbro 255, I went out in the country and did some long boosting and tuning I think i found the problem 9.95:1AFR when the missing starts :shock: Why is my AFR getting so rich as i raise boost without the meth?
                      HOLY CRAP somthing is not right there. What are you using to find your AFR's? I dont understand HOW IN THE HELL a stock ecu could possibly make a 10:1 afr on stock injectors and at 10lbs boost WITHOUT the meth.

                      That shouldnt even be possible.
                      85 Z31 6.0 LSX turbo 766whp/792wtq
                      04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

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                      • #12
                        Fuel pressure?
                        imagination is a virtue

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                        • #13
                          craZed wrote: Fuel pressure?
                          Not unless you have a rising rate regulator that bumps it up somthing grazy like 5psi per lb of boost.
                          85 Z31 6.0 LSX turbo 766whp/792wtq
                          04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

                          Comment


                          • #14
                            a miss , as in blown out spark, will show up as rich mixture on the wide band. best way to explain is with no fire the fuel is just pumped through, and shows on the wide band are real rich mixture. .040 is wide enough for the spark to be blown out. i run .030 on my nitrous car and both my turbo cars.
                            85 300zx turbo BSP autox
                            84 300zx turbo 12 psi DD
                            82 camaro z28 street car 10.12 @ 135.5

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                            • #15
                              You guys do realize that adding methanol IS adding fuel to the engine, even if methanol has a different stoich ratio, octane rating, evaporative cooling and even BTU content.

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