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Thread: 3A92 1.2L Mirage exhaust header by SuperCircuit

  1. #1
    Administrator Daox's Avatar
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    3A92 1.2L Mirage exhaust header by SuperCircuit

    I was digging for fun stuff and ended up finding a header for the 1.2L 3A92. The blog post is from June 18, 2015, so its a fairly recent development. No idea of the build quality nor do I have any reviews on it, but it does look pretty nice. The dyno chart they provide a picture of is a little odd. It has 3 separate pulls on it so you don't know really what is what. I never saw a picture of the stock exhaust manifold, but it does look pretty horrible haha.

    SuperCircuit is a company in Malaysia. I'm going to email them about a price shipped to the US so we have some idea. SpeedLab quoted someone here I think $250 (currently $180 USD) shipped to Australia.

    Here is the email reply from SuperCircuit:

    The SUPERCIRCUIT 3-1 Headers made for Mitsubishi Mirage 1.2L is USD237.00 each.

    It will be an extra USD70.00 each for the delivery via Post Office's EMS. The normal leadtime will be around 15-20 working days to arrive your doorstep.
    Mitsubishi Mirage (6th Generation) Header


    Name:  Mitsubishi Mirage 1.2 extractor & cat removal (c).jpg
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    Name:  Mitsubishi Mirage 1.2 extractor & cat removal (e).jpg
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    blue = stock
    red = Supercircut header
    green = Supercircuit header plus 2ndary CAT removed

    Name:  Mitsubishi Mirage 1.2 extractor & cat removal (h).jpg
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        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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    DirectNova (12-23-2015)

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    I wonder if it triggers Oxygen sensor2 code after eliminating converter.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.7 mpg (Imp)


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    Uber Mirage alex16's Avatar
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    It should. The double spark plug anti fowler trick should work
    2014 ES F5MBD aka 5MT. I am a full time Uber driver, if you want to drive for uber DO not sign up without my referral code for a bonus .

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.8 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 53.9 mpg (Imp)


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    Quote Originally Posted by alex16 View Post
    It should. The double spark plug anti fowler trick should work
    I am curious if it is already built in in lower port.

    EDIT: looking at pictures the joint between OEM exhaust manifold and converter is flex joint and it is missing with header. How is it going to affect durability?
    Last edited by cyclopathic; 12-24-2015 at 12:54 AM.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.7 mpg (Imp)


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    Senior Member Mitz's Avatar
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    I just wonder why I have only one O2 sensor and not two? Is it only for the Asian models or the Philippine variant only.

    What are the pros and cons of having just one O2 sensor?

    This is my exhaust manifold & primary CAT
    Name:  Exhaust manifold+cat.jpg
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    Name:  Exhaust manifold+cat 2.jpg
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    Had the assembly replaced with Stivo headers (similar to Speedlab's) last year.

    Name:  Stivo Headers.jpg
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    Note:
    There is no flex joint or pipe in the OEM Exhaust system. It is supported by 3 rubber hangers only.
    Last edited by Mitz; 12-24-2015 at 11:00 PM.

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    The sensor after the cat is there to test the performance of the cat itself. It's part of US OBD2 (on board diagnostics) emissions requirements. Not sure about the rest of the planet.

    regards
    mech

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage de 1.2 manual: 55.7 mpg (US) ... 23.7 km/L ... 4.2 L/100 km ... 66.9 mpg (Imp)


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    Uber Mirage alex16's Avatar
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    The old trick for the down stream/ second o2/ after cat o2 is to use two spark plug anti fowlers, one with the tip drilled out as big as possible so the o2 sensor can poke through, then screw it into the second one and screw it all together, the small hole from the first anti fowler prevents a large amount of the exhaust from passing over it so it makes the ecu think there is a functioning cat in place. I think the o2 sensors in our mirage are larger threads than the traditional spark plug threads common to o2 sensors of the past
    2014 ES F5MBD aka 5MT. I am a full time Uber driver, if you want to drive for uber DO not sign up without my referral code for a bonus .

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.8 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 53.9 mpg (Imp)


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    Uber Mirage alex16's Avatar
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    How hard is it to swap to the header? Doesn't look too bad, I might get one, I bet it increases hp and mpg a tiny bit. Possibly 3-5whp and 1-2 mpg. But when figured over 100k miles 1 mpg could pay off $100 at $2 gallon 2 mpg =$200. Header would almost pay for itself in mpg if it actually makes a difference.
    2014 ES F5MBD aka 5MT. I am a full time Uber driver, if you want to drive for uber DO not sign up without my referral code for a bonus .

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.8 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 53.9 mpg (Imp)


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    I think your math is a little bit off. Going from 45 to 46 MPG would save you 48 gal of fuel.

    With respect to Spark foulers no need to drill they sell right size on Amazon and eBay if you ever need one.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.7 mpg (Imp)


  11. #10
    Uber Mirage alex16's Avatar
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    I under estimated the fuel savings usually but my math could be wrong

    48 gallons $2 gallon =$96 which I rounded to $100.


    The issues with the anti foulers was the tip of the o2 sensor is to long sometimes, drilling out the tip of one anti fouler and screwing it into a non drilled anti fouler would give the clearance the sensor needed


    2014 ES F5MBD aka 5MT. I am a full time Uber driver, if you want to drive for uber DO not sign up without my referral code for a bonus .

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.8 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 53.9 mpg (Imp)


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