Re: WI causing knock?
at that power level, those jets are rather small anyhow.
usually injecting pure water slows flame front speed and increases the ignition delay.
it has the same effect as retarded ignition timing.
As the water has to take steep turns though the intake plenum you will have rather uneven cylinder distribution.
Still this would not cause increased knock with water.
I could envision that the new "tune" applies more ignition advance than the old one. Timing is only pulled once the knock count exceeds a certain level. you might start closer to this knock threshold with the new tune compared to the old one and thus exceed it earlier causing the ECU to pull timing.
What about mounting 4x 0.4mm C jets like I use right before the main fuel injectors. it is tremendously effective. then run water/methanol, just feeling and increase boost to 1.6bar :-).
From my limited 1.8T experience, they take 1.4bar and a tad more even without any water with a bigger T4 turbo.
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