Kenworth Pyrometer/EGT Gauge

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mitchtazz, Dec 25, 2014.

  1. x1Heavy

    x1Heavy Road Train Member

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    I prefer to have Mr Pyro on the dash, it is the one big piece of information that tells me how she is working. If she is going to burn up or get all hot and bothered Mr Pyro sees it first and I'll drop a gear or two and ease off.

    The other item would be EGT's as long all 6 agree within a few degrees of each other then that tells me the pistons are happy. If one or more do not agree then there is any number of issues ranging from manifold seals to all the way up the wazoo.

    I agree it has nothing to do whatsoever with regen. Thats just BS speak. I guess when those of us old enough to understand Mr Pyro dies off then the younger generation will not know the difference when they hear that BS speak.
     
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  3. mitchtazz

    mitchtazz Road Train Member

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    Exhaust temp isn't actual, it's calculated, I've seen it via the engineering program. It uses other parameters such as fueling rate, boost, engine load, and coolant temp to guess what the exhaust temp is..

    I'm not really sure about the mechanical boost gauge on the new style dash, but what I do know is that the intake manifold pressure sensor is on port 44 of the engine connector.

    The sensor has three pins. Pin#1 is +5vdc supply, pin#2 is sensor return, and pin#3 is signal.

    Try adding another sensor, a better sensor and get it to talk to the ecm instead of that combo sensor. 20190926_133330.jpg 20190926_133316.jpg 20190926_133330.jpg 20190926_133316.jpg
     
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  4. bbechtel16

    bbechtel16 Medium Load Member

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    How are you monitoring all 6 cylinder‘s EGTs individually?
     
  5. x1Heavy

    x1Heavy Road Train Member

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    If you had a Lycoming 4 cylinder in a 152 or a 172 or Archer airplane there is EGR below the pilots panel to the right. All of the temps need to be within a few degrees in flight so that the engine is operating properly.

    I have never seen this in a heavy engine for trucking. Only a Pyro.

    When you have many gauges up there on the dash all of them tell a story and eventually you understand alls well or maybe there is a problem. They could have used sensors on each cylinder at the manifold. If one got too cold or worse way too hot you know which one to look at first.
     
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  6. Ridgeline

    Ridgeline Road Train Member

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    Omg sooo much misinformation.


    The exhaust temps are not calculated.

    The gauges that are installed in many of the trucks are hooked directly up to k type junction sensors which are passive in nature. They are not normally hooked up to the ecm and provided by the manufacturer of the truck, not the engine.


    Those in post #12 are all active sensors which means they need power to provide an output voltage to the ecm.
     
  7. mitchtazz

    mitchtazz Road Train Member

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    So are you telling me that because my truck does not have a factory egt sensor that the engine doesn't know how hot it's exhaust is?

    How would it know when to cut fueling or open the EGR valve?
     
  8. Snow Monster

    Snow Monster Medium Load Member

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    If your ECM hasn't been tampered with neither you or your engine has need to know it's EGT.
    The computer monitors everything else, makes changes according to programming and won't let the engine melt, the new engines are practically driver proof.

    About your pyrometer dilemma.
    Look at the exhaust pipe 6" to 8" behind the turbo, you'll probably see a plug that can be removed.
    That's where the pyro sensor/probe goes.

    A simple google search, (Kenworth Pyrometer), will give you all the pyrometer gauges, sensors and kits than you can shake a stick at, 2" and 3" diameter, analogue or digital, take your pick.

    You can probably find plugs in the exhaust manifold where you can install a sensor for a quicker and more accurate EGT reading, can reach 1500º or 1600º on a warmed over engine.
    Problem here is, if the tip of the probe/sensor burns off it will mess up your turbo when the burnt off tip hits the turbo blades.
     
  9. bbechtel16

    bbechtel16 Medium Load Member

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    I think there is some confusion here which is partially my fault for highjacking the thread. Yes the ISX does calculate EGT, I think. I am talking about a 12.7 powered glider which certainly doesn't calculate or care what the EGT is. I have installed pyrometers before. I am trying to find an actual OEM gauge for boost pressure NOT from the ECM, so it matches the other OEM gauges. The 12.7 ECM can't read boost pressure over 32 psi.
     
  10. mitchtazz

    mitchtazz Road Train Member

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    I'm not familiar with the Detroit engine. But I can take a look at my electrical schematics to see where the CECU gets it's boost information from.

    I know the new style dash has all smart gauges except for the load suspension gauge, and then earlier I found out that older trucks with the new style gauges actually had a mechanical EGT gauge.

    If there's a mechanical boost gauge I won't know until someone chimes in like the other user did and states that his model and year has a mechanical boost gauge from factory.

    I know a guy that replaced pretty much all of his gauges with the teltechs or whatever they're called and he said it's night and day from factory. He said he can watch his water temp rise and fall by 0.1* just by pressing on or backing off of the throttle.

    My #### just magically goes from 180* to 200* to 205* back down to 180* after the fan kicks on.
     
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  11. bbechtel16

    bbechtel16 Medium Load Member

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    Thanks for the help so far guys. I used that VIN and came up with Q43-1144-112K
    Gauge Pyrometer Gen3
    But that is just the gauge. The dealer is telling me the sensor probe/sensor/thermocouple is Q21-1035
    Sensor-Exhaust Pyrometer
    $169?! That's weird the gauge is "only" $111. Typically the sensor is the cheap part of the equation for a pyro kit. You can get a whole kit for the price of the Kenworth gauge no doubt, but it won't match. If you go back to that first part they do call it a kit, so that is a little confusing as well. All it shows is a gauge...
     
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