M30 guys whats your coolant gauge at?

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  • ThatOneEuroE30
    R3V OG
    • Dec 2013
    • 8626

    #1

    M30 guys whats your coolant gauge at?

    So i have my cooling system routed like the one in this picture with an e36 mishimoto rad and 75 degree thermostat. At idle in my drive way it sits directly at half way. How ever when cruising its sits at 1/4 there isn’t any air in the system or leaks. Anyone out there have similar setup and temp?



    Im thinking of wiring in a legit coolant gauge i have to see the actual water temps. Thoughts?


    1989 325is l 1984 euro 320i l 1970 2002 Racecar
    1991 318i 4dr slick top


    Euro spec 320i/Alpina B6 3.5 project(the never ending saga)
    Vintage race car revival (2002 content)
    Mtech 2 turbo restoration
    Brilliantrot slick top "build"
  • kronus
    R3V OG
    • Apr 2008
    • 13000

    #2
    Why do you have a 75 degree t stat
    cars beep boop

    Comment

    • ThatOneEuroE30
      R3V OG
      • Dec 2013
      • 8626

      #3
      Originally posted by kronus
      Why do you have a 75 degree t stat


      Got a low temp thermostat since the car will be mostly driven in the summer to help prevent it from getting hot.


      1989 325is l 1984 euro 320i l 1970 2002 Racecar
      1991 318i 4dr slick top


      Euro spec 320i/Alpina B6 3.5 project(the never ending saga)
      Vintage race car revival (2002 content)
      Mtech 2 turbo restoration
      Brilliantrot slick top "build"

      Comment

      • kronus
        R3V OG
        • Apr 2008
        • 13000

        #4
        Your ecu will see the low temp and fuck around with the mixture to try to get the engine to warm up. You should run a factory temperature thermostat.
        cars beep boop

        Comment

        • ThatOneEuroE30
          R3V OG
          • Dec 2013
          • 8626

          #5
          Originally posted by kronus
          Your ecu will see the low temp and fuck around with the mixture to try to get the engine to warm up. You should run a factory temperature thermostat.
          that would explain the extreme rich running condition


          1989 325is l 1984 euro 320i l 1970 2002 Racecar
          1991 318i 4dr slick top


          Euro spec 320i/Alpina B6 3.5 project(the never ending saga)
          Vintage race car revival (2002 content)
          Mtech 2 turbo restoration
          Brilliantrot slick top "build"

          Comment

          • e30davie
            E30 Mastermind
            • Apr 2016
            • 1788

            #6
            Originally posted by ThatOneEuroE30
            Got a low temp thermostat since the car will be mostly driven in the summer to help prevent it from getting hot.
            This is not How it works.

            A thermostat in working order regulates temperature to its specified temp.

            Your incorrect thermostat is just making your engine run too cool. Probably making it slower and less fuel efficient:)

            Comment

            • ThatOneEuroE30
              R3V OG
              • Dec 2013
              • 8626

              #7
              Well I’ve ordered a new thermostat got an 80 degree one


              1989 325is l 1984 euro 320i l 1970 2002 Racecar
              1991 318i 4dr slick top


              Euro spec 320i/Alpina B6 3.5 project(the never ending saga)
              Vintage race car revival (2002 content)
              Mtech 2 turbo restoration
              Brilliantrot slick top "build"

              Comment

              • lukeADE335i
                E30 Fanatic
                • Apr 2013
                • 1384

                #8
                I run a 71 degree thermostat. BMW ran these from factory in their hot climate pack - places like Australia and Saudi Arabia, so maybe the extra headroom does something?!

                Car runs around 1/3rd (just over 1/4) on the cruise, and gets up to half stopped in traffic due to my 80 degree fan switch. One day I might try a Porsche 75 degree switch if my 80 degree one packs up, but it all works fine.

                I have had zero overheating issues vs. the many problems we seem to hear about on here ;-)
                My e30: OEM+ with M30B35

                Comment

                • e30davie
                  E30 Mastermind
                  • Apr 2016
                  • 1788

                  #9
                  My 82deg one works fine up here in Queensland. No overheating either. Sits at 82deg on my COD temp gauge no matter what temp it is outside.

                  Comment

                  • Bearmw
                    E30 Fanatic
                    • Aug 2010
                    • 1323

                    #10
                    My car runs just about like Luke's car. No issues.
                    Never argue with stupid people, they will drag you down to their level and beat you with experience. -Mark Twain

                    Comment

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