This is a post from one of the other threads about this topic. I think it is important for everyone to see this if they have not already. I also think the reason that an after market tuner would not catch this is to my knowledge (which is limited) you get your car into a certain gear and do a "pull" on a dyno and they tune according to that. Rinse and Repeat until the tuning is done. During this process you do take the engine to redline, but do not "speed" shift through the gears at redline. Therefore they would never look at the transient ignition retard numbers because they would not see the detonation.
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Originally Posted by Sithspawn
A quick heads up for everybody. This car has issues with detonation with the factory tune. I'm not talking about crappy Cali gas, but the ECU calibration guys at Subaru screwed up here.
This failed engine is a direct result of cascading failures due to a bad tune. Detonation is not normal and anyone who says so, ought to be doing something else for a living.
Detonation over time will damage engine internals. This is a given. The first component to fail on this engine with the detonating tune is the nylon collar on the direct injector tip. When that insulator cracks and breaks off due to detonation, there is nothing left to protect the injector seal from combustion gasses and the seal fails as a result. Then, the failed seal leaks, causing more detonation and misfires until the engine throws in the towel (or a rod).
This car detonates on the 2-3, 3-4, 4-5, 5-6 shifts when driving the car hard. By hard, I mean WOT and shifting with speed and authority. I have attached a log that shows detonation happening at exactly the shift points (you can see the engine speed rising to redline and the shifts). On the 2-3 and 3-4 shifts I logged, there was detonation resulting from too much timing advance which can also be seen in the log. Keep in mind that this is the factory tune and all I did was log what it does.
I have also attached a view of the factory Transient Ignition Retard Table that shows that it is not pulling jack for timing in the high rpm range. It does pull timing at low rpm and low load, but keeps the timing too far advanced up top. This is due to the fact that the base timing map is advanced a lot in the low load range at high rpm (which the engine sees when you close the throttle for your shift).
Apparently, there is a new flash from Toyota that fixes the tune...sadly, the tune is what ultimately caused the engine failures here people. Subaru needs to step up and fix their mistake.
In closing, while not everyone drives their FRS/BRZ like a madman, driving this car hard will eventually kill the engine with the stock tune. Tracking the car only accelerates the inevitable death of the engine since you are shifting like this much more often.
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It should also be noted that @
Sithspawn did another log after updating the transient ingnition table and stated that the detonation was gone.