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open loop vs closed loop on pr3

Discussion in 'ECU's, Electronics, and Tuning' started by legutki, Aug 6, 2003.

  1. legutki

    legutki Senior Member

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    I went open loop so i only had to use 1 o2 sensor. Are there any disadvantages?
     
  2. D See 2

    D See 2 Senior Member

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    not that i know of.
     
  3. blundar

    blundar Senior Member

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    something isn't right. My bet is that you get a "mugen" PR3 chip from some chipping company. I say this because on the case of my homie's ECU chipped by prospeed it says sumthin almost exactly like that.

    I've seen a lot of PR3 chips, and they fall into pretty much 3 categories:
    1. Modified stock- still has 2 O2, knock, vtec pressure, closed loop
    2. "Spoon" PR3 - 1 O2, no knock, some have some lack vtec pressure, closed loop
    3. "Mugen" PR3 - NO O2, NO knock, NO vtec pressure, LOTS of fuel, NO closed loop.

    The main drawback of not having closed loop is fuel economy. In all likelyhood, you're running way rich a lot of the time. Other than that, nuttins wrong...

    You probably want to get more accurate info from the person who chipped that ECU. I'd bet money you have the Mugen variant as its the most common.
     
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