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Old 10-09-2007, 01:31 AM   #1
Scooby Specialist
Member#: 135913
Join Date: Dec 2006
Chapter/Region: South East
Location: wellington, fl
96' R33 Skyline

Default quick compression question

on a wrx motor with a vf39 and fmic, hypothetically speaking, would changing the stock pistons (8.2:1 ratio i believe?) to a higher compression (perhaps 9.x:1) increase turbo spool up time? thanks
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Old 10-09-2007, 01:48 AM   #2
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
1990 Legacy wagon
goes 12.387 @ 116.5


hypothetically speaking "yes". More power down low, harder to tune the higher the boost.
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Old 10-09-2007, 08:23 PM   #3
Sammo Hung
Member#: 10613
Join Date: Sep 2001
Chapter/Region: South East
Location: S Ga / N Fla


well depending on the bottom end the life span
could be reduced due to the increase in compression.
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Old 10-09-2007, 09:51 PM   #4
Homemade WRX
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Join Date: Mar 2003
Chapter/Region: MAIC
Location: Mooresville, NC
96 3MI Racing LLC
search FIRST, then PM!!!


your lag would decrease...peak power on pump gas might become a limitation but your power would be more efficient...
this and alky would be a big bonus...even more decreased spool and higher octane for the street.
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