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  1. #1
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    Why can we tune w/o taking care of EGT?

    Hey guys,
    i just have one simple question (i did not find with the answer with the communitysearch):
    Why can we play with the boost, AFR, timing etc. without getting into critical EGT areas?
    I can not see any value for EGT with BT-Tool in the Engine Management.
    The last car i tuned was injected (not directinjected) and turbocharged fourcylinder and it had two sensors placed between head and turbine housing so i could monitor the temperatures on my notebook and had to go down with the AFR values at WOT to get safe exhaust gas temperatures (~11,5:1).
    So how do you choose your AFR at WOT? Could we drive Lambda 1 at WOT without getting into damaging EGT areas too (i know that this isnŽt as powerful as Lambda ~0,85; iŽm just trying to understand the facts of the N54)?


    Greets from Germany
    Bernd

  2. #2
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    Bump to help with answer, tuners where are you?

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

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    There is an OEM EGT monitoring system but it's not very accurate. EGT is always a factor in mapping particularly the AFR under heavier load. The EGT data is just difficult to collect (and subjective) so we don't share that information on public forums.

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    ^ How exactly can EGT data be subjective?

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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    It's subjective where tuners think they know where the temps get too high and things go boom. On certain cars this can be 1650-2000 under heavy sustained load. Some tuners have found the boom - and adjusted things more conservatively after the failures Click here to enlarge EGT plays a huge role when you manipulate the timing advance as well. Especially under part throttle. Most blindly tune those areas - which is scary. Sometimes a degree or two in the wrong areas can influence the temp by 100-200 degrees.
    Last edited by BrenM3; 02-02-2011 at 03:54 PM.

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    Thanks Terry! I didnt know that there even is a OEM option to show EGT. Thats the answer i waited for.

    But here is the second one: Where can i find this EGT value (with BT-Tool)? Sorry, maybe i just overlooked it.

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    Click here to enlarge Originally Posted by fischergeiz Click here to enlarge
    Thanks Terry! I didnt know that there even is a OEM option to show EGT. Thats the answer i waited for.

    But here is the second one: Where can i find this EGT value (with BT-Tool)? Sorry, maybe i just overlooked it.
    As Terry mentioned it's slow and inaccurate. If you are going to use it as a tuning tool I would be prudent.

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    Click here to enlarge Originally Posted by BrenM3 Click here to enlarge
    As Terry mentioned it's slow and inaccurate. If you are going to use it as a tuning tool I would be prudent.
    Where/how can he find the OEM EGT value?

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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    I don't have a n54 right now to check (Because they are junk) JK

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    if you get lambda codes you will see the temperature of the gases in it:

    2C78:
    2C78 Lambda probe behind catalytic converter 2, signal
    Error will cause a warning light
    Error is not currently present
    Test conditions have been completed
    Timeout

    Freeze Frame Information
    Event 1Odometer 70056kms 43530miles
    exhaust fume temperature behind catalytic converter bank 2 736.00 ∞C
    resistor Lambda probe behind catalytic converter bank 2 65,280.00 ohm
    voltage Lambda probe behind catalytic converter bank 2 0.43 V
    time since start end 1,126.40 s

    Event 2Odometer 70192kms 43615miles
    exhaust fume temperature behind catalytic converter bank 2 768.00 ∞C
    resistor Lambda probe behind catalytic converter bank 2 65,280.00 ohm
    voltage Lambda probe behind catalytic converter bank 2 0.41 V
    time since start end 3,276.80 s

    Event 3Odometer 70408kms 43749miles
    exhaust fume temperature behind catalytic converter bank 2 672.00 ∞C
    resistor Lambda probe behind catalytic converter bank 2 65,280.00 ohm
    voltage Lambda probe behind catalytic converter bank 2 0.35 V
    time since start end 1,254.40 s
    07 335i AT - MOTIV 750 - MHD BMS E85 - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
    Click here to enlarge

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    Why can i just read these temperatures if i get a (fault) code of the lambdas? Should i have to deliberately provoke such a code or can it be saved in a log?
    I think iŽll try it with the OEM EGT monitoring because its even better than no EGT value at all (comparing the percentage alteration, not the absolute values).

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    Click here to enlarge Originally Posted by fischergeiz Click here to enlarge
    Why can i just read these temperatures if i get a (fault) code of the lambdas? Should i have to deliberately provoke such a code or can it be saved in a log?
    I think iŽll try it with the OEM EGT monitoring because its even better than no EGT value at all (comparing the percentage alteration, not the absolute values).
    i did not say YOU CAN JUST see them through codes. 'there is probably a channel in the BT that allows you to monitor them but i have no idea how...
    07 335i AT - MOTIV 750 - MHD BMS E85 - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
    Click here to enlarge

  13. #13
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    It is a BT channel. The JB4 monitors is and uses the data for tuning purposes. But it is slow and potentially inaccurate so take that in to account. Better than nothing though!

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