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Many turbo cars in racing run no recirculation/atmospheric relief valves at all! (Although these are almost always Journal bearings, which can take more abuse). Slight compressor surge isn't a huge deal, it has a lot to do with physics, momentum of the compressor wheel, and the ability of the charged air to flow back through it quite easily. Seriously, research it on some other sites! The theory is far more complex than what I can write here in a quick post. However, I would still always run a recic/bov on a street car, especially BB turbo, and really, that is all you need to know, and adjust your relief spring pressure accordingly. Also, note that often people confuse the "Ch-ch-ch" noise of a recirc/boc chatter for compressor surge. This is not the case, and it is actually just the BOV spring tensioning and shutting the valve successively when there isn't enough air pressure being relieved to keep it open.
Z32's with recircs/bov's are really not at all prone to damaging compressor surge from what I've read/experienced
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"If Charlie Sheen quit doing cocaine - and a month later, he
died of a heart attack... Nobody would be surprised.". Same
thing with the VG: If the engine was tuned, stopped detting -
and a month later, cracked a wrist pin... Nobody would be
surprised. |
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