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      12-13-2013, 11:20 PM   #65
solstice
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Drives: 2015 M3 6MT
Join Date: May 2013
Location: Seattle

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Quote:
Originally Posted by ixse View Post
my evo ran about 21psi tapering down to 16ish stock.. with added 3port and simple pipings it ran safe 23psi tapering to 19psi all day with added near 50whp. there is always room for improvement on timing, afr, boost. factory always have huge safety margin.
The evo has a compression ratio of 9:1. 23psi should compare to about 20 psi at 10.2:1. The S55 is already running 18psi peak stock.
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