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Position of Air Temp sensor in Plenum

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    #16
    Originally posted by burn is weird View Post
    beware the bosch combined IAT and MAP doesn't have great resolution in vacuum (only goes down to 30kPa absolute) so isnt really suitable for very high vacuum engines. i'd put it before the throttle body as you'll peg the sensor on high RPM throttle lift if you were going to run one.
    Looking at some logs from yesterday, mine reads down to 13kpa absolute on throttle off. I'm using this sensor specifically: https://www.bmotorsports.com/shop/pr...ia84ff4p01b065

    And their supplied calibration points of
    P1 -> 11 kPa at 0.25V
    P2 -> 307 kPa at 4.75V

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      #17
      sorry guys, you are correct. I have only used the 4 bar map/temp sensor. it has a much more limited vacuum sensing scale.

      as has been pointed out by the gentlement above, the 3 bar sensor doesn't have this problem (but life starts at 3 bar doesn't it?)

      Oo___oO

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        #18
        3bar would be a challenge with my 11.5:1 compression and 98 octane

        The vac range on the 4bar does look terrible though: https://www.bmotorsports.com/shop/pr...ia84ff4p01b065

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          #19
          I cant find the vac range on the Ballenger site, only the temp data.

          From some avid googling it sounds like the BP often only pulls 20inHg, which the 4bar should cope with (about -8psi)

          Edit: this suggests it goes down to 50kpa, so 7psi vac: https://www.bosch-automotive-catalog...uct/0281006051
          Chris
          ------
          The new nugget
          I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

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            #20
            Originally posted by takai View Post
            MAP sensor...
            Sorry, put the combined map/temp sensor on the intake pipe before the throttle body, and a map only sensor on the intake manifold.

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              #21
              Originally posted by Paul M View Post
              Sorry, put the combined map/temp sensor on the intake pipe before the throttle body, and a map only sensor on the intake manifold.
              This gives nothing over a Honeywell temp sensor and the 3 bar Haltech MAP sensor.
              Chris
              ------
              The new nugget
              I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

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                #22
                Originally posted by takai View Post
                I cant find the vac range on the Ballenger site, only the temp data.

                From some avid googling it sounds like the BP often only pulls 20inHg, which the 4bar should cope with (about -8psi)

                Edit: this suggests it goes down to 50kpa, so 7psi vac: https://www.bosch-automotive-catalog...uct/0281006051
                Hit the specifications tab and it gives you:
                Calibration Data:

                P1 -> 50 kPa at 0.40V
                P2 -> 400 kPa at 4.65V

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                  #23
                  Ah, bummer.
                  I ordered a few of these 4 bar T-Map sensors a week ago.
                  I looked for min/max data, but couldn't find it either, so took a gamble.

                  My 5SGTE idles at 40kpa, and max vac i see is ~20kpa on over-run.
                  So not ideal not reading the correct vac, but im hoping it wont effect my tune so much, or i'll be able to tune around it.
                  I'll soon find out i guess

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                    #24
                    Originally posted by jasonp1977 View Post
                    Hit the specifications tab and it gives you:
                    Calibration Data:

                    P1 -> 50 kPa at 0.40V
                    P2 -> 400 kPa at 4.65V
                    Ah duh. I was too distracted by the images.

                    Originally posted by MWP View Post
                    Ah, bummer.
                    I ordered a few of these 4 bar T-Map sensors a week ago.
                    I looked for min/max data, but couldn't find it either, so took a gamble.

                    My 5SGTE idles at 40kpa, and max vac i see is ~20kpa on over-run.
                    So not ideal not reading the correct vac, but im hoping it wont effect my tune so much, or i'll be able to tune around it.
                    I'll soon find out i guess
                    Interested in how you get on with it. Im still considering it as the 3bar looks like a good thing.
                    Chris
                    ------
                    The new nugget
                    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

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                      #25
                      Originally posted by Paul M View Post
                      Sorry, put the combined map/temp sensor on the intake pipe before the throttle body, and a map only sensor on the intake manifold.
                      Can't you just have both? IAT from the plenum and then IAT2 from before the butterfly, then onboard map in the plenum and map2 in the IC pipe?
                      These sensors hate condensation, so make sure it's not on the bottom.

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                        #26
                        Originally posted by Komdotkom View Post
                        Can't you just have both? IAT from the plenum and then IAT2 from before the butterfly, then onboard map in the plenum and map2 in the IC pipe?
                        These sensors hate condensation, so make sure it's not on the bottom.
                        Can you run both internal map and external map on a PS1000?
                        Chris
                        ------
                        The new nugget
                        I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

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                          #27
                          Not sure, I run both but that's on Motec.

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                            #28
                            yea you would, one would be mapped as the MAP sensor and the other as a boost sensor.

                            Oo___oO

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