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Old 02-10-2004, 10:58 AM
3.0 BAR
Join Date: Feb 2003
Posts: 9,089
Default Re:CEL with AFC HACK

think about it like this.. the AFC is a voltage modifier. it modifies the voltage of the MAP sensor. so if its 3.0v - 30% or 3.0v - 40%.
88crxSi is offline  
Old 02-10-2004, 11:28 AM
3.0 BAR
Join Date: Feb 2003
Posts: 9,089
Default Re:CEL with AFC HACK

ok.. the higher the MAP voltage the ECU see's is how much boost/vac is currently in the engine.

example, not accurate to actual voltage/vac/psi.

0v = -20vac
.5v = -10vac
1v = 0vac
2v = 1psi
3v = 3psi
4v = 7psi
5v = 10psi

so you have your afc set at -30%

say you're reading 10 psi on the boost gauge..

5v-30% = 3.5v
5v-40% = 3.0v
5v-20% = 4.0v

get it yet?

again you can see why you are getting CEL's. You are not scaling it back enough to keep the ecu from seeing positive pressure (boost) but just if u scale it back any more you risk running lean. Maybe you should get slighly larger injectors or consider a turbo edit solution?

88crxSi is offline  
Old 02-10-2004, 12:23 PM
3.0 BAR
Join Date: Apr 2003
Posts: 2,260
Default Re:CEL with AFC HACK

I spiked over12psi every cold morning. NEver threw a CEL on a -40% to -36% through my RPM range.

Make sure your boost gauge is accurate. Have you tried watching your AFC and getting the bar reading from that? 10psi should be about .69 bar on your AFC.
TurboEF9 is offline  
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