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Gauge Setup; What would you monitor? Need Input

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    #16
    Originally posted by nando View Post
    stock coolant gauge already tells you temp accurately enough if you make sure it's working properly (really not that hard). no use having redundant gauges, especially if it's a street car.

    either AFR or MAP gets my vote. oil temp really just tells you when it's OK to romp on it, maybe not important on a race car, but again, a street car is different. of course, you can also use a pressure gauge to guestimate oil temp too, because your pressure at idle will drop significantly as the oil heats up.
    Hmm, I was under the impression that the stock water temp gauge was really not very accurate and may be reading the same temperature over a vast sweep of the needle.

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      #17
      no, BMW didn't start "buffering" the coolant gauges until around the E36.
      Build thread

      Bimmerlabs

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        #18
        Originally posted by nando View Post
        no, BMW didn't start "buffering" the coolant gauges until around the E36.
        Ah, I know my e39 would read the same temperature throughout the gauge except basically in the blue and red zones.

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          #19
          Originally posted by evandael View Post
          coolant temp, oil temp, oil pressure, and AFR.
          This

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            #20
            Originally posted by 325ix View Post
            Hmm, I was under the impression that the stock water temp gauge was really not very accurate and may be reading the same temperature over a vast sweep of the needle.
            I am not sure of the e30 gauge but in newer cars this is true.

            Most OEM senders used we measured can have a variation around +/- 15 degrees, but the needle shows no change as the ECU is happy since the reading is in its acceptable range. The Water/Oil/Trans temperature sender I supply error range = 2% or +/- 2 deg

            Been trying to tell Josh to turbo his ride as it would make decision making easier!
            Last edited by MC Hammered; 11-22-2012, 02:38 PM.


            My 1989 e30 s52 Touring... this is Betty

            My 1989 325i vert (sold)...this is Nina

            My 1991 M5 (sold)... this is Veronica

            Photo comparison: OEM vs aftermarket windscreen for a convertible

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              #21
              I look at water temp, oil temp, oil pressure primarily,

              and then also do trans temp and diff temp. The trans temp is never a problem.

              The diff gets warm.

              I also log AFR, revs and throttle position. When I rob the box off the other race car,
              I'll log 2 g's and steering position as well. (Innovate LM1. It's old, but it works)

              The logic on oil temp is to be nice to the motor- it takes a LONG time
              to warm up, and unless it's 'green green green'
              then it's not a big challenge to softpedal it just a bit until the temp comes up to
              operating.

              Also, I had an air pocket (or something) in the oil system once, and my cooler didn't work
              for the first oil change. So I was seeing 250- 270 f at first in cool ambients
              when I was nosed under someone.
              Drain and refill (same type of oil) and now never see much over 220.

              Anyway, that's what I do. Fuel pressure's smart to look at... but I don't, yet, as the
              AFR doesn't show problems.
              now, sometimes I just mess with people. It's more entertaining that way. george graves

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