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<blockquote data-quote="shiroitenshi" data-source="post: 2581715" data-attributes="member: 27518"><p>That's normal, if you go WOT from low RPMs, there will be a bit of knock, (mine does too, but since it's a P30 with a knock sensor, it retards about 3-5degs upon detecting knock) but if you have it on part throttle, it means you are running lean most probably.</p><p></p><p>Try bumping up fuel pressure a notch or two for starters. If already at 3 bar idle, try 3.2-3.4. It's a rough way of increasing fuelling without messing with VAFC/ECUs. If you're still at 2.5 bar, that's your problem right there then.</p><p></p><p>B20 is tentative, depending on condition of the B16A block. Only if it's worn/damaged to the point it needs a rebore will I change it. I don't think so far yet on what piston to use, but one plan in my head is a stock B20B with the stock head in my car, and slapping a medium size turbo for quick spool and medium hp targets :P.. but that's just one of the possible upgrade paths.</p><p></p><p>With 2cc domed 85mm wiseco's in stock.. well........ no worries about what kind of pistons to use in a pinch eh?</p><p></p><p>The LMA's are EXPENSIVE, yes. With a couple of hundred bucks extra, can buy a used type R head.</p><p>I'm just strange that way, but I wanted new, not used since I plan to keep the car for a long time. Most people would just get a used head.</p><p></p><p>But I don't think my B16A bottom end is in that bad of a condition.. but well.. we'll see.</p></blockquote><p></p>
[QUOTE="shiroitenshi, post: 2581715, member: 27518"] That's normal, if you go WOT from low RPMs, there will be a bit of knock, (mine does too, but since it's a P30 with a knock sensor, it retards about 3-5degs upon detecting knock) but if you have it on part throttle, it means you are running lean most probably. Try bumping up fuel pressure a notch or two for starters. If already at 3 bar idle, try 3.2-3.4. It's a rough way of increasing fuelling without messing with VAFC/ECUs. If you're still at 2.5 bar, that's your problem right there then. B20 is tentative, depending on condition of the B16A block. Only if it's worn/damaged to the point it needs a rebore will I change it. I don't think so far yet on what piston to use, but one plan in my head is a stock B20B with the stock head in my car, and slapping a medium size turbo for quick spool and medium hp targets :P.. but that's just one of the possible upgrade paths. With 2cc domed 85mm wiseco's in stock.. well........ no worries about what kind of pistons to use in a pinch eh? The LMA's are EXPENSIVE, yes. With a couple of hundred bucks extra, can buy a used type R head. I'm just strange that way, but I wanted new, not used since I plan to keep the car for a long time. Most people would just get a used head. But I don't think my B16A bottom end is in that bad of a condition.. but well.. we'll see. [/QUOTE]
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