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Thread: EGT Monitoring

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    dnielsen's Avatar
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    EGT Monitoring

    Anyone monitoring exaust gas temps? If do where would you mount the probe? Wondering if this is feasable and how accurate.


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    Everthing louder than everything else! sHALlow's Avatar
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    Quote Originally Posted by dnielsen View Post
    Anyone monitoring exaust gas temps? If do where would you mount the probe? Wondering if this is feasable and how accurate.
    i know skoepp and beerdart do.

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    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by sHALlow View Post
    i know skoepp and beerdart do.

    My EGT bung is on my header at flange.

    Beer dart has his on the oem manifold at each port where is unjacketed.
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    dnielsen's Avatar
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    Quote Originally Posted by skoepp View Post
    My EGT bung is on my header at flange.

    Beer dart has his on the oem manifold at each port where is unjacketed.
    Thanks skoepp! You said EACH port, so he is monitoring each cylinder/port? I was thinking about trying it with the torque plate.

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    What are the benefits of monitoring EGT. Mainly for engine safety or tuning?

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    dnielsen's Avatar
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    Its good to monitor you EGTs when running these modified boosted engines. If you've ever seen what happens when these engines run lean you get the picture, cooked valves and pistons. There is always the potential for one cylinder to fail due to a bad injector, when monitoring AFRs most (if not all on our machines) are monitoring somewhere near the end of the exaust manifold or a header. This gives you a combined reading of all three cylinders, so if one sees the AFRs out of range they typically adjust fuel by changing injectors, fuel pressure, or duty cycle of the injectors (rude controller). This usually affects all three cylinders at the same time, no way to adjust per cylinder. The EGT monitoring gives you another tool for monitoring lean conditions or excessive heat. It would be good to have the ability to monitor AFRs and EGTs on each cylinder, at minimum it would be nice to monitor each cylinders EGTs.

  7. #7
    Quote Originally Posted by dnielsen View Post
    Anyone monitoring exaust gas temps? If do where would you mount the probe? Wondering if this is feasable and how accurate.
    Looks like you monitor afr's. Simplest way would be to drill and tap the block off plug that goes into the O2 sensor bung. Then mount the t'couple for the Egt there. The dynotune setup works nice, but is only available to read in degrees C. You would need to convert to degrees F. My ski runs between 325 C at idle, 550 C in midrange and up to 860 C at wot. You may also consider monitoring fuel pressure. Once you know where the Egt and fuel pressures run at various rpm's and afr's you don't really need to look at afr's. In the cooler weather you can increase fuel pressure slightly to get the egt's in line and in the summer you can decrease the fuel pressure slightly to lean it out and bring the Egt's back up for that extra 100 rpms.
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