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Thread: Broken Turbo

  1. 23rd March 2014, 08:34 PM #1
    bidds's Avatar
    bidds
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    Broken Turbo

    Installed a new map about 8 weeks ago. Has been going really well, however...

    Today while dragging a 1100kg'ish trailer home from a camp, up a shallow incline at 110km/hr, the power died. Still ran fine but didn't have any grunt; no obvious problems. I pulled over and checked for faults on the NANOCOM: nothing on engine or gearbox.

    Switched off and on, hoping for an over-boost reset. I had been watching the boost and temps via the NANOCOM (no apparent issues) so it was wishful thinking. No luck in any case.

    Did some aulro searching: found wastegate solenoid bypass - tried that but no joy.

    With the inlet air hose (MAF-turbo) off, I noticed the ends if the impellor seemed to have impacted the housing and the nut on the shaft was loose. It seems the turbine and compressor impellers are no longer connected. Feels like the turbine/exhaust side has seized.

    Drove home at about 80km/hr, dropping to 55km/hr up the hills. Will pull it apart over the next few days and report.

    Has anyone else had something similar? Any idea of a cause (could it be the map ? - it's a very reputable one with emphasis on reliability) or is it just one of those things?

    Cheers,

    Bidds
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  2. 24th March 2014, 06:21 AM #2
    Dougal
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    How much boost was out running and how hot was the egt in a sustained load situation?
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  3. 24th March 2014, 06:58 AM #3
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    bidds
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    1.3 Bar is the max I've ever seen/recorded on the NANOCOM; I think the max yesterday was 1.28.

    No idea about the EGT though - no EGT guage - idea of the conservative map was to avoid having to monitor it.
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  4. 24th March 2014, 07:00 AM #4
    Dougal
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    Quote Originally Posted by bidds View Post
    1.3 Bar is the max I've ever seen/recorded on the NANOCOM; I think the max yesterday was 1.28.

    No idea about the EGT though - no EGT guage - idea of the conservative map was to avoid having to monitor it.
    The only conservative map which doesn't require EGT monitoring; is the factory map.
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  5. 24th March 2014, 07:54 AM #5
    twr7cx
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    Quote Originally Posted by Dougal View Post
    The only conservative map which doesn't require EGT monitoring; is the factory map.
    Debatable, I'd still monitor the EGT.
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  6. 24th March 2014, 10:45 PM #6
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    What sort of temps do you see?
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  7. 25th March 2014, 09:43 AM #7
    twr7cx
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    Quote Originally Posted by bidds View Post
    What sort of temps do you see?
    Anything from 0*C before I start the car in winter to 700*C, after which I back off to keep them down.
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  8. 25th March 2014, 09:46 AM #8
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    Quote Originally Posted by twr7cx View Post
    Debatable, I'd still monitor the EGT.
    Unless you're at max GCM locked in 3rd sport trying to hold 110 up a hill, you're not going to cook it on a stock map.
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  9. 25th March 2014, 10:07 AM #9
    Dougal
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    Quote Originally Posted by Disco Muppet View Post
    Unless you're at max GCM locked in 3rd sport trying to hold 110 up a hill, you're not going to cook it on a stock map.
    You'll see max temps in high gears, particularly when rpm drops and boost also drops. 4th (auto) will give higher EGT than 3rd.

    It is a common and completely wrong misconception that high rpm is required to give high EGT.
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  10. 25th March 2014, 12:43 PM #10
    schuy1 Guest
    I have been told that high RPM will give a lower EGT reading due to the highish through flow of gases, has a sorta cooling effect like when the fan kicks in with a radiator. loaded, low RPM, more fuel burnt, slower though flow of gases, causes the EGT to rise. That is why going down in the gears will lower EGT with a load.
    Sound feasible? Thats what I been told anyway and it makes sense to my mind as thats what happens with a non turbo.ed motor, let it labour in a high gear loaded and the temp gauge goes up.
    Cheers Scott
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