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  • Air Inlet Temps

    Here is one for the gurus,
    Ok have loaded air intake temp on the scan guage but what does it do and what do the temps mean to the average user.
    Is there a danger limit on the temp.
    Thanks in advance

  • #2
    I guess its showing you how effective your intercooler is. The cooler the air is the denser it is, the more energy produced at combustion.

    Out of interest what temps are you getting?

    Aaron
    2012 PB 30th Anniversary Challenger, Arb 2.5m awning, Maxtrax, ORS Platform and MSA dropdown slide, Boo's Bashplates, MSA seat organisers with trays, GME 3120s uhf, GME 4705 UHF, Lovells Springs, Arb Deluxe Bullbar, Mitsubishi tow bar, 265/65 17 D697's At's, triple ram mount with ipad and lots more to come.

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    • #3
      Hi Tilly, I do not have the answer but there are 2 inlet air temperature sensors on the Challenger.

      One is built into the MAF sensor on top of the air-box and it measures under bonnet inlet air temp pre turbo, pre intercooler, etc so it is ambient + additional heat from engine bay.

      The second temp sensor is on the induction manifold and this measures the actual intake air in the manifold just prior to induction into the cylinders so obviously this will be higher than the MAF sensor temps as the air is boosted and the intake manifold will be quite hot .

      I am not sure which temp is measured by the Scangauge, I will take a closer look to see if I can confirm though.

      EDIT: A quick check of the Scangauge User Manual Pg 27 states that CIA (Celsius Inlet Air temp) should be "slightly higher than ambient due to under bonnet temperatures", it is easy for under bonnet temps to reach 70, 80, 90 and even 100 degrees Celsius on a hot day when the engine is working hard and one must remember that most of the air that comes into the engine bay has passed through the radiator, intercooler, transmission cooler and AC condenser first plus the additional heat input from the turbo and exhaust systems.
      So based on this I am thinking the air temp sensor in the MAF sensor is used by the Scangauge.

      cheers, old Jack.
      Last edited by old Jack; 14-11-13, 01:29 PM. Reason: Additional info
      2011 PB Base White Auto, Smartbar, Cooper STMaxx LT235/85R-16,TPMS, HR TB, 3 x Bushskinz, front +40mm Dobinson , rear +50mm EHDVR Lovells, Dobinson MT struts and shockers, Peddars 5899 cone springs, Windcheater rack, GME UHF, Custom alloy drawer system inc. 30lt Engel & 2 x 30 AH LiFePo batteries + elec controls, Tailgate hi-lift/long struts, Phillips +100 LB & HB, Lightforce 20" single row driving beam LED lightbar, Scanguage II.
      MM4x4 Auto Mate, Serial No 1 .

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      • #4
        Isn't the standard air intake on the Challenger mounted on the top radiator support panel so it draws almost directly from the outside, under the front lip of the bonnet?

        It will heat up a little as it passes through the intake tube to the air filter box, but doesn't take quite the circuitous route that you describe. If the vehicle has a snorkel there will be even less preheating. I'd expect a couple of degrees over ambient to be pretty close at the MAF sensor.
        Chris

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        • #5
          Originally posted by aaron.miller View Post
          I guess its showing you how effective your intercooler is. The cooler the air is the denser it is, the more energy produced at combustion.

          Out of interest what temps are you getting?

          Aaron
          In a recent trip to King Ash Bay in the Northern Territory last month outside temps on the road were 35-42 degrees Celsius and on my scan gauge air intake temps got up to 65 degrees Celsius. Was towing a 1200 kg boat and normal water temps were 90-94 degrees touring at 100- 110 km/hr Up hills the temp climbed to the upper limits stated. . The Automatic Transmission temps varied between 70 - 100 degrees with again the higher reading being reached with uphill climbs . Total average diesel consumption for the 7500 km trip was 17L/100km. most of the trip was high speed highway driving towing the boat.

          Alex
          NX GLS MY15 Pajero 265 265 17 BFG AT KO2 Bilsteins & Lovells, ARB Bar Airtec Snorkel Runva XP11 Full BushSkinz Underbody Protection and RockSliders, Donaldson Filter, LRA Tank, Icom 450N 75W HID Spots & Lightbar Drifta Drawers MSA Fridge Slide Engel Fridge CTek 250 120AH Battery 65L Water Tank Paddle & Lockup-Mate
          NL 1999 Pajero 3.5L Cargo Barrier UHF Roof Rack. Dual Battery Engel Fridge No Airbags

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          • #6
            Interesting thread.

            I have recently installed a blue tooth transmitter and hooked it up to the Torque app. on my phone. Quite a cheap method really. I can only assume the figures displayed on the app are correct. After all, the blue tooth reader and app are only visualising the information output by the OBDII

            According to the Torque App, inlet temps on my Challenger have reached 60 C. while the "coolant temp" has reached 97 C. This for only short periods but I would have thought that it was quite high. Usually while only towing a 6x4 with a smallish load or similar, and then up a hill. However given boiling point is approx 100 C. it is a worrying figure.

            I assume boiling point is higher when you add coolant and put it under pressure in a closed system. I don't like watching the figures go that high though.

            The average highway running temperature of my coolant according to the app is 93-94 C. It climbs quickly when engine load and boost pressure rise.

            This on day with an ambient temp of 20 C.

            I would be very interested to see what temps you guys are getting. Should I be worried?
            2012 LS Manual, ARB Deluxe Bar, King Springs and Bilstein Shocks, Kumho AT51's 265/70/17, Narva Ultima 225's, Factory Tow Bar, Tint, Rola Aero Bar and Rolla roof Basket.

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            • #7
              Originally posted by Griff76 View Post
              Interesting thread.

              I have recently installed a blue tooth transmitter and hooked it up to the Torque app. on my phone. Quite a cheap method really. I can only assume the figures displayed on the app are correct. After all, the blue tooth reader and app are only visualising the information output by the OBDII

              According to the Torque App, inlet temps on my Challenger have reached 60 C. while the "coolant temp" has reached 97 C. This for only short periods but I would have thought that it was quite high. Usually while only towing a 6x4 with a smallish load or similar, and then up a hill. However given boiling point is approx 100 C. it is a worrying figure.

              The Challenger has a thermostat that starts to open at 82C and is full open at 95C and as diesels run hotter than petrol engines the 97C is ok, this is what mine sits on most of the time and the gauge is at 1/2. The cooling system runs a 30/60 ratio coolant and a 94-122kpa pressure so this brings the coolant boiling point up to 119-124C so I would not be getting worried until about 112-115C.

              I assume boiling point is higher when you add coolant and put it under pressure in a closed system. I don't like watching the figures go that high though.
              Knowing the above info hopefully you can relax.

              The average highway running temperature of my coolant according to the app is 93-94 C. It climbs quickly when engine load and boost pressure rise.
              I find it is the slow city traffic in summer that push the coolant temps up a little.

              This on day with an ambient temp of 20 C.

              I would be very interested to see what temps you guys are getting. Should I be worried?
              This afternoon I took particular notice of my inlet air temps, around the city in 20C outside I was reading 50-55C inlet in the traffic, highest I can remember seeing is on a 45C+ day last summer on a very long & steep hill climb at 110kph, fully loaded (not towing) and that was about 70C inlet air temp and I seem to recall about 106C coolant temp and 75-80C ATF.



              cheers, old Jack
              2011 PB Base White Auto, Smartbar, Cooper STMaxx LT235/85R-16,TPMS, HR TB, 3 x Bushskinz, front +40mm Dobinson , rear +50mm EHDVR Lovells, Dobinson MT struts and shockers, Peddars 5899 cone springs, Windcheater rack, GME UHF, Custom alloy drawer system inc. 30lt Engel & 2 x 30 AH LiFePo batteries + elec controls, Tailgate hi-lift/long struts, Phillips +100 LB & HB, Lightforce 20" single row driving beam LED lightbar, Scanguage II.
              MM4x4 Auto Mate, Serial No 1 .

              Comment


              • #8
                Thanks OJ. Great information. I had hoped that I was worrying needlessly.
                2012 LS Manual, ARB Deluxe Bar, King Springs and Bilstein Shocks, Kumho AT51's 265/70/17, Narva Ultima 225's, Factory Tow Bar, Tint, Rola Aero Bar and Rolla roof Basket.

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