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Thread: Noob turbo/sc question - MAP sensor

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    Individual-1 ☚☻☛ Agent☣Orange's Avatar
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    Noob turbo/sc question - MAP sensor

    Iím just curious but do you turbo or supercharger guys with Megasquirts use an aftermarket MAP sensor for your calculations or do you rely on the stock one? I know you eliminate the MAF sensor so what are you using to measure manifold pressure?

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    Original Gearhead pdexta's Avatar
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    Re: Noob turbo/sc question - MAP sensor

    Megasquirts have a built in map sensor. The MAF gets thrown away and a replaced by a vacuum line running from the intake manifold to a port on the megasquirt.
    Scott
    2001 Honda S2000 ♦ 6sp
    2005 Civic Hybrid ♦ 5sp

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    Re: Noob turbo/sc question - MAP sensor

    Oh that’s pretty cool but wouldn’t you want the MAP sensor mounted on the intake manifold itself? Also, what purpose does the stock MAP sensor serve then?

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    Original Gearhead pdexta's Avatar
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    Re: Noob turbo/sc question - MAP sensor

    The only stock air sensor is the restrictive MAF.

    Regarding the MAP sensor location, every MS I've used has had the sensor inside the ECU. I'm assuming you gain some reliability and ease of install by putting it in the ECU. You may lose some incremental accuracy through 6 feet of vacuum line, but I don't think it's significant enough to justify moving the sensor to the engine bay.
    Scott
    2001 Honda S2000 ♦ 6sp
    2005 Civic Hybrid ♦ 5sp

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    Re: Noob turbo/sc question - MAP sensor

    More specifically, the stock Miata MAP sensor is actually labeled “Boost sensor” and sits above the passenger side engine bay. Even though Mazda calls it a boost sensor, it was never designed to measure actual boost, well maybe on a Mazdaspeed with its turbo setup but anyway, is this stock sensor ignored by the Megasquirt or is it used in conjunction with Megasquirt’s built-in MAP sensor?

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    Original Gearhead pdexta's Avatar
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    Re: Noob turbo/sc question - MAP sensor

    That sensor is used by the EGR system to trigger when the car opens the solenoid to recirculate exhaust into the intake manifold. I don't believe it has anything to do with air/fuel metering or tuning. With an aftermarket ECU it would typically go in the trash next to the stock MAF.
    Scott
    2001 Honda S2000 ♦ 6sp
    2005 Civic Hybrid ♦ 5sp

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    Re: Noob turbo/sc question - MAP sensor

    Ah, the stock boost sensor is part of the EGR system, got it. Thanks!

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