in regards to compression, i know low comp pistons is about 9.1 on a sax.
but in respect to high comp e.g 10.5 .1 that normally limots your boost to about 7 psi ish.
the funny thing is from speaking to ferriday engineering who do de comp plates, he was saying world rally cars run about 13.1 compression with 30psi boost. its only the super advanced engine management that lets it run like that and not blow itself to bits!!!!
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