Originally posted by CorvallisBMW
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IMO mye28 is the BEST place for m30/turbo information.
"What spark plugs should I use?
It is recommended that when turbocharging that you drop two to three heat ranges on your plugs. NGK and Denso make plugs which work well in turbo applications. I run
NGK BPR7ES which well and are 2 ranges colder than stock. BPR8ES also work well and are 3 ranges colder than stock and work well for higher boost levels. NGK’s numbering system has the heat range decreasing (ie – colder) as the number increases, so the 8 is colder than the 7 (stock is a 5). I gap mine to 0.028” and have no problems with spark blowout. Also keep in mind that heat ranges between brands may not correlate directly. "
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