makes me lol when people drive their cars on the street and just cruising around then let their turbo timer stay on for a few minutes, its so pointless, unless your hills thrashing or on the track ya turbo's just wont get that hot.
Yeah, im pretty sure the cause was a bad puel pump, its was replaced, but obviously it was to late for it and it ended up dying on me, but it also could have been a bad injector as only one piston was like that, all the others were fine.
yeah, as you can see in this pic a large piece of the piston broke away but was held in place buy the rings, so under boost the piece was pushed back in to fill the whole, only blew big clouds of white smoke every now and then when i took off from the lights.
when my rb20 did a piston, i only noticed cos of the weird sound at idle, boosted hard for the months i drove it around till i did the conversion. It never made the the sound your talking about under boost, def sounds like a turbo/zorst leak.