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Old 08-01-2013, 06:19 PM   #1
Tjrommel
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@all the tuning wizards

I had an idea (uhohh). If we were to upgrade coil packs and spark plugs would it be possible to push more fuel and air into the engine with factory throttle body/injectors? I'm sure if we upgraded the ignition we could gain a good chunk of power if it is possible to get more air and fuel in with stock intake?


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Old 08-01-2013, 08:15 PM   #2
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That's assuming that the ignition system is a limiting factor for us making power.
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Old 08-02-2013, 06:04 AM   #3
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That's he exact assumption I was making lol. With direct inject, especially 12:1 compression... The stronger the spark the better, but in the air Fuel ignition setup I don't know what the limiting factor is so I figured why not start with the cheapest and easiest. I've never changed injectors on a direct inject setup so I have no idea what is involved. In regards to that, seeing as the crawl runs at upto 2300 psi I figured it is more than enough to place a larger charge of fuel in the combustion chamber assuming we can get enough air with out forced induction to make a stronger ignition a viable option for a decent gain with mild tuning
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Old 08-02-2013, 07:46 AM   #4
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That's he exact assumption I was making lol. With direct inject, especially 12:1 compression... The stronger the spark the better, but in the air Fuel ignition setup I don't know what the limiting factor is so I figured why not start with the cheapest and easiest. I've never changed injectors on a direct inject setup so I have no idea what is involved. In regards to that, seeing as the crawl runs at upto 2300 psi I figured it is more than enough to place a larger charge of fuel in the combustion chamber assuming we can get enough air with out forced induction to make a stronger ignition a viable option for a decent gain with mild tuning
was just thinking the same thing not to long ago. But alas I don't know that there is anything avail for us to increase spark
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Old 08-02-2013, 08:01 AM   #5
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3 point iridium plugs and I'm sure we could retrofit coil packs on easily
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Old 08-02-2013, 08:54 AM   #6
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3 point iridium are junk , it can only fire to one point at a time , if it only fires to one point at a time then what good are they ???? There not

More fuel can be added through a tune you dont need to change injectors to add more fuel , get a few mods on your engine and going 1 step colder on the plugs helps on this engine , the coil packs seem to be very strong

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Old 08-02-2013, 10:15 AM   #7
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So going with your suggestions, how much power could logically be possible? And with what you said, is the ignition system the weak link or is it the desire for fuel economy that inhibit the development? And 3 points aren't junk, current goes to path of least resistance. There is more surface area and a strong conductor. This results in a "wider" spark. It's not about the volts but it's an issue of surface area
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Old 08-02-2013, 12:28 PM   #8
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current goes to path of least resistance.
Correct. Because it follows the path of least resistance, the spark will only jump from the center wire to one ground wire at a time. Therefore, there really is not more surface area available for the spark. I suppose you might argue that, since there are 3 ground wires, the plug will not wear and increase gap as quickly, but having three ground wires will not give you a fatter spark.
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Old 08-02-2013, 12:54 PM   #9
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Want to know how strong the ignition system is? Set your plugs to some crazy wide gap until you can hear or feel the misfires (so say 0.060).

As for fuel delivery, you don't need to change the injectors till you start pushing 300-450/500whp (limiting factor for the Mazdaspeed crowds). Probably could switch out the High Pressure Fuel pump piston to a larger one to give higher psi in the higher rpms (not that we have lean conditions on high load/rpms).

So you're most likely fine with the stock iridium plugs which really are the best you can get. I might pick up some one step colder (have 3, one broke when removing from previous car) and see how the car reacts stock. For those who want to get different plugs, there isn't a lot of information for the Focus and it's spark plugs but it is virtually the same (other than heat range) as my previous 2006 Mazdaspeed 6.
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