Ford Focus Forum, Ford Focus ST Forum - View Single Post - The duratec long tube headers fit!!! (no check engine light)
View Single Post
Old 04-24-2012, 10:44 PM   #79
darkangelism
Sonic Crew #04
 
darkangelism's Avatar
 
Join Date: May 2011
Fan#: 85425
Location: oklahoma city, OK
What I Drive: 2012 Focus Titanium Hatch

Posts: 7,329
FF Reputation: 9 darkangelism Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by JSR84 View Post
Well first off lets use some more realistic numbers for an intake. Air modification, particularly intakes screw with the MAF calibration. In closed loop its not really an issue because the ECU creates fuel trims to compensate however, when in OL the ECU ignores the fuel trims and fuels totally based of the mass air reading from the MAF. If the MAF isn't calibrated correctly the engine doesn't hit its targeted A:F. In some cars it can be a big issues and cause CEL's, in others its not that big of a deal. I prefer to provide the ECU with the correct information to fuel the engine appropriately. When you start compounding modification without making any adjustments to the tune, you start compounding the fueling errors etc.
He has more than an intake to get his 30HP.
darkangelism is online now  
    Reply With Quote