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Message: <blockquote data-quote="synchron" data-source="post: 818430" data-attributes="member: 115">This is what i have in mind for base on my ideas 20v s/c:-1) Low comp pistons2) bigger injectors3) Piggyback or standalone3) stronger valve if possible4) custom intake manifold5) Custom brackets6) Custom pipings7) Bypass valvesThis is why i think the later 4agze are stronger than the older 4agze:-1) MAP & AFM system, MAP system got less restriction2) MAP & AFM pistons, MAP got 8.9:1 comp ratio & AFM got 8.0:1.3) MAP & AFM ECU, MAP system is much simple.4) MAP & AFM Fuel, MAP Fuel delivery system is also different.5) MAP & AFM Ignition, MAP ignition much more stronger faster.The other reasons will be the same as rollakid.There is no such thing as the semi forged. There is only 2 type of piston manufacturing way, cast and forged. The normal pistons is made out of casting and the material used Eutectics. 4agze pistons is also cast but they have a different material Hypereutectics. Hypereutectics pistons has more silicon content which make the piston stronger. Both MAP and AFM pistons are coated. Why alot of performance engine uses the AFM pistons:-1) Design of the AFM pistons is much stronger than the MAP ones2) AFM piston wall are thicker than the MAP ones.3) AFM pistons has lower compression than the MAP ones.4) More valve clearance on the AFM pistons than the MAP ones.I have seen alot of MAP piston fail when they are boost over 1 bar. I have yet to see a AFM pistons even they are boost till 2 bar.When you use the high comp piston boosting over 1 bar, fuelling is a very important and the engine will feel slugish in the end of mid till top range.</blockquote>

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