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Thread: MGP sensor instead of MAP sensor?

  1. #1
    Fuel Injected!
    Join Date
    Mar 2014
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    42
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    MGP sensor instead of MAP sensor?

    Has anyone here experimented using a Gauge Pressure Transducer instead of a MAP sensor? I've got a 5vdc -14.5psig to +14.5psig on order to experiment on my own supercharged set up.

    The idea of using 100kpa on the tables as actual atmosphere despite altitude and baro conditions sounds interesting. In theory it sounds like a way to utilize the full range and resolution of the tables, also possibly target the same cells under the same driving conditions no matter the elevation.

    Anyone tried it, pro's/con's?

  2. #2
    Fuel Injected!
    Join Date
    Mar 2014
    Age
    42
    Posts
    22

    Re: MGP sensor instead of MAP sensor?

    In anticipation of the +/- PSIg sensor to arrive, today I opted to play with the existing 3 bar MAP sensor on the car. Rescaled the voltage/KPA offsets and give myself the 100kpa reading at atmosphere despite actually being at 84kpa atmosphere.

    With a vacuum gauge (PSIg) hooked up to the engine I saw it idles at a steady 16.5 inHg of manifold vacuum, I adjusted the MAP low offset so it reads 44kpa at idle then readjusted the high offset to get back to 100kpa with the engine off.

    Started the VE table over from scratch with a new Y-axis, new timing table and new target AFR table. So far it's dialing in just fine. I don't have any trips planned outside of this altitude so I don't need to worry about my "100kpa" atmosphere changing with actual atmosphere.

    So far it's dialing in just fine. I did datalog 10psi max output from the supercharger, +2psi over it's normal output above atmosphere leading to me think it's a scaling of the MAP sensor thing instead of it actually making more boost. I'm inclined to hook up an analog PSIg gauge to read vac/boost to make sure it matches the MAP under all conditions.

    To me it's finally nice to think of tuning in traditional terms without transposing to high altitude. I did try to use the transfer function from KPA to PSI for the table Y-axis but found I didn't like using - PSI in vacuum cells because I'm not used to it. KPA and inHg feels most natural. We'll see how it goes with the actual sensor installed and once I get the car out of town to different elevations and dial in the baro tables. Side note, my controller has a separate baro sensor isolated from the MAP so the baro is still accurate.

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