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Aurora40 · 07-18-2009

From what I understand (from Todd), you basically divide the duty cycle/puslewidths in half when the secondaries are operating. Datamaster isn't doing that.

Edit: The only thing sorta off is the MAP pressure? Seems sorta low, especially if the ambient pressure was over 100kPa that day. If you scroll back to when you were at WOT but at a low RPM, what is the pressure there? How much is it dropping as the RPMs rise? I usually see about a 2-3kPa drop or so. More than that, and perhaps your air filter is dirty or your duct is collapsing or something like that?

07-18-2009	#5
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: Need help understanding scan data From what I understand (from Todd), you basically divide the duty cycle/puslewidths in half when the secondaries are operating. Datamaster isn't doing that. Edit: The only thing sorta off is the MAP pressure? Seems sorta low, especially if the ambient pressure was over 100kPa that day. If you scroll back to when you were at WOT but at a low RPM, what is the pressure there? How much is it dropping as the RPMs rise? I usually see about a 2-3kPa drop or so. More than that, and perhaps your air filter is dirty or your duct is collapsing or something like that? Last edited by Aurora40; 07-18-2009 at 01:25 PM.