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Old 08-31-2006, 02:54 PM   #40
Scooby Specialist
Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
04 Improved STI
Dirty White


That's another arguement for widening the LSA so that that intake cam is more advanced and the exhaust cam is retarded, you can always bring them closer together with AVCS or a even more sophisticated system that works on both cams. Doing so would elevate the importance to AVCS tuning overall. Maybe some of us should try retarding the exhaust cams with a sprocket.

NA motors can also benefit from tuning of the AVCS following the more classic arguement that cam overlap will increase induction velocity at high RPM. The map for an NA car is just a portion of the one for a force induction car. The big difference to me will be that you can be slightly more aggressive with cam overlap under vacuum because you don't have this big blockage in the exhaust called a turbo. In an NA motor, I'd think that you could keep AVCS active all the way to redline and still have gains, where as under boost there's the blow thru potential that Phil is talking about.

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