SCFM @ Different PSI

If a compressor is rated 5.4 SCFM @ 90 PSI, what SCFM is it capable of producing @ 40 PSI? Thanks!

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Bill says...

No idea!

I have been looking for a formula for this for years, and have asked everyone I know.

If someone reads this, and can help out both this anonymous contributor and this website, please post!

Thanks,

Bill