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Old 04-07-2005, 11:25 AM   #1
jblaine
Scooby Guru
 
Member#: 8512
Join Date: Jul 2001
Chapter/Region: South East
Location: St. Pete, FL
Vehicle:
2002 WRX chassis...
stage-infinity.com

Default Big vacuum target AFRs

I realize this isn't a sexy area to talk about but I am curious what kind of AFR targets make sense (and why) for high vacuum situations. I recall datalogging my stock setup targeting ~20:1.

My thinking (hypothesizing) is that maybe a little fuel (14:1?) would be good to run at high RPM + high vacuum in our cases since this is usually indicative of the end of a WOT run and either:
  • a shift up, in which case it might be better left alone
  • engine braking (entering a turn) - could use the time to do a little cooling while off load
  • braking just before a downshift - could use the time to do a little cooling while off load

Perhaps I'm naive, but it seems like this is an area we're kind of free to play with a bit.

I'm not really able to find any good information on it.
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