The blown motor resource thread

Discussion in 'Mazdaspeed 3 Troubleshooting' started by mituc, Feb 14, 2019.

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  1. mituc

    mituc Greenie Member

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    Recently we had a motor letting go out of the blue. There was absolutely no sign of it having any sort of issue, the engine was sounding well and the logs were showing everything was perfect.

    The owner did not open the engine yet, it's going to be a bit expensive. The engine let go during a pull to produce a set of logs for what it was supposed to be the last revision of that tune.
    GTX2867R gen2, Ultimate racing V3 catted DP and catted&resonated TP were installed one day earlier.

    The detonation sound at second 12-13 in the following video clip corresponds to the beginning of the KR trail at line 73 in the attached log.

    Did anyone have a motor fail suddenly without any sign, and smidge of knock, everything in check (load, boost, AFR)?

    The only thing that worth mentioning is that this log was the first one after a 40-50 minutes break following the first logging session with a tune closer to stock values (300g/s of air, max load 2.05-2.1 in mid range). 3 people in the car including the driver, so around 6 seconds for 60-100mph sounds about right for the air flow and timing we see in the logs which indicate there was no significant compression drops or leak downs. Oil was fresh too, 200 miles on it, 0w40 ACEA A3/B4 (Millers).

    The engine was running solely on pump gas, 95OCT/101RON with 8-10% Ethanol content (E10).
     

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  2. Raider

    Raider Administraider Administrator Platinum Member

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    How many miles?
     
    Raider, via a mobile device, Feb 14, 2019
    #2
  3. mangosmoothie

    mangosmoothie Platinum Member

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    mangosmoothie, via a mobile device, Feb 14, 2019
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  4. mituc

    mituc Greenie Member

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    Around 80k... the car was also used for city short trips as part of the commuting, but the oil changes were religiously done at 5-6k miles.
     
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  5. JohnnyTightlips

    JohnnyTightlips Gold Member

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    I was at 155k and I was not doing a log. I got on it a little in 4th and the car said no thanks. Rod broke and put two holes in the block. You can see all the pics in my build thread. Definitely not the cheapest way to start a rebuild. I had no signs of it going bad other then oil consumption which it had been doing since I owned the car and had it tuned for 25k miles.
     
  6. Code Monkey

    Code Monkey Gold Member

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    Mine went out without any signs.
     
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  7. BioBandit

    BioBandit Gold Member

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    My motor went at 118k miles with no warning. I was just going down the street to get some Arby's on the way out in second gear it ate all the oil and shutdown on me in the middle of the road.
     
  8. Eroler1

    Eroler1 Greenie Member

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    mine spun a rod couple years ago when my rock auto $72 oil pump fail. the pressure valve came off where the spring is located and starved the engine when dataloging with pte 6062,
    built block
    manley piston
    clevite bearings
    4x d07 99.99% methanol on jmf manifold
    etc
    still didnt find the cause of why the valve in the oil pump came off but only reason I know that might cause is running thicker oil 20w-50 vr1 synthetic oil.
     
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