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I have seen some people have done AAN rebuilds using after market Pistons. Has anybody that ran aftermarket Pistons with Motronic noticed any adverse effects in regards to knock control?
Yes, it's possible to get "ghost" knock with big clearance pistons.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
Yes. Forged 2618 alloy need really big piston/cyl clearance, 4032 can be used with smaller clearance but still clearly bigger than the stock piston/cyl clearance.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
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