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arghx7 · 12-01-2015, 11:51 PM

I'm not too active on this forum lately but I did get caught up with this thread, as these things tend to die and suddenly get revived.

The AVCS intake side has the negative values @thambu19 and others were talking about because it is a mid lockpin AVCS. That means the intake side can retard, not just advance. The retard is a fuel economy thing. It's the same type of AVCS that's on the FA20DIT. In fact, it's the BorgWarner phaser technology that Ford uses on the 5.0 Mustangs. On those FA20DIT engines when you delete the tumble generator valves you need to advance the AVCS or it runs like crap without all that tumble motion in the combustion chamber.

more details (mostly relevant to FA20DIT) here http://forums.nasioc.com/forums/show....php?t=2687550

12-01-2015, 11:51 PM	#166
arghx7 Senior Member Join Date: Nov 2011 Drives: car Location: cold Posts: 599 Thanks: 72 Thanked 611 Times in 185 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	I'm not too active on this forum lately but I did get caught up with this thread, as these things tend to die and suddenly get revived. The AVCS intake side has the negative values @thambu19 and others were talking about because it is a mid lockpin AVCS. That means the intake side can retard, not just advance. The retard is a fuel economy thing. It's the same type of AVCS that's on the FA20DIT. In fact, it's the BorgWarner phaser technology that Ford uses on the 5.0 Mustangs. On those FA20DIT engines when you delete the tumble generator valves you need to advance the AVCS or it runs like crap without all that tumble motion in the combustion chamber. more details (mostly relevant to FA20DIT) here http://forums.nasioc.com/forums/show....php?t=2687550 Attached Images