|
OP
I know there is a lot of discussion here regarding detonation. And with some of the reading and images, this does look like detonation. Also the rotating assembly out of balance does not help either.
Here is my input:
Detonation occurs due to not enough motor octane and too high compression ratio. The gas explodes violently instead of burning evenly. Now the DME constantly monitors A/F and knock ( or at least we hope it was ) and if anything registers, it should automatically pull timing. If that is not enough it will add fuel to richen the mixture.
Now all of this being said, and the assumption your DME was working properly even if you ran 87 octane, the computer should compensate and reduce the timing. If the detonation occuring is beyond the computers capability to make adjustments, you get the damage that you had.
As another poster mentioned a leak down test would have shown the problem immediately. Not just a compression test. But like I stated earlier, BMW did the bare minimum to correct the issue, and we all know the end result.
This is the reason why I refuse to put a tune on my car because its a cop out for BMW to fuck you in the end. Good luck with the new build and send us some photos when you get them.
|