|
If you have to manually compensate for cam angle adjustments, that really sucks. The wisdom of cam advance for fuel economy comes from the fact that you get more internal EGR with cam advance, but it's a tradeoff. The highest efficiency method is maximum intake cam retard and cooled external EGR.
I would try an external EGR tube feeding ahead of the throttle plate with a restrictor orfice (so that most of the restriction comes from the orfice, not the tube), with a shutoff valve. That will get you your extra EGR with little disruption to fueling.
|