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Thread: E38 LS7 exhaust gas temps on idle?

  1. #1
    Member Age08's Avatar
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    Default E38 LS7 exhaust gas temps on idle?

    Does this sound right for exhaust temps on idle which are around 360-400c with the engine @ 90c?
    the motor is a LS7 with heads milled 20' and a cam with .649In/.660Ex lift, 227/243 duration and lsa 115,
    Air fuel on idle is 14.5-14.7, with timing hunting around 15-20.

  2. #2
    Joe (Moderator) joecar's Avatar
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    How are you measuring...?

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    Quote Originally Posted by joecar View Post
    How are you measuring...?
    I am using a Egt probe installed on the number 2 cylinder exhaust port.

  4. #4
    Joe (Moderator) joecar's Avatar
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    Those temps are ok for warm idle.

    What do they hit at WOT...?

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    When I get a chance today I data log it,
    Also I was little out on the temps it's actually 525c not 400c on idle, I calculated wrong from Fahrenheit,
    Now the probe is right on the main against the exhuast port of that makes a difference

  6. #6
    Joe (Moderator) joecar's Avatar
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    Are you running catalytic converters...?

    The key is this:
    - at idle you want barely enough temperature to keep the cats lit (something like 400-600*F).
    - at WOT/load you want to be below the catalyst danger threshold (about 1200* F or under).

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    Member Age08's Avatar
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    I am running cats,

  8. #8
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    Here a log I did while driving steady at 100kmh, its has a short wot burst never the end,
    Attached Files Attached Files

  9. #9
    Joe (Moderator) joecar's Avatar
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    I think you're ok... I see COTP kicking in briefly, this is normal after a WOT pull.

  10. #10
    Joe (Moderator) joecar's Avatar
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    BTW: for E38 log GM.ETCTP instead of GM.ETC, and log GM.HO2Sxx instead of O2Sxx.

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