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The primary reason for EGR is to reduce peak combustion chamber temperatures which dramatically reduces NOX formation.
That is not a guess.
Federal law provides a $2500 penalty for intentionally disabling emission systems.
That applies to vehicle owners. The penalty for businesses is considerably higher.
If you can advance timing with EGR disconnected then you have other issues.
This is based on 60,000 hours of experience.
I don't read about any significant number of people here who are involved in violating emissions laws, so the rationale of "I do it because every one else does it" seems to be weak logic, and if I did think that I would be very worried about someone in the EPA enforcement section reading about any members willingness to violate emissions laws.
I don't, and I wont, because I understand that when operating properly, emissions controls work fine with my mileage enhancement techniques, and I probably would not come to this forum if I thought the consensus opinion was that following the legal requirements was a matter consensus ignorance of the purpose and the consequences of taking the illegal route, not even considering the fact that from the very inception of emissions controls, beginning with Positive Crankcase Ventilation, in 1963, the significant reductions in airborne pollution has been a positive benefit.
In the early seventies the emissions controls were so poorly designed that many people disconnected them in a flawed effort to increase performance. The principle reason for lower power was lower compression.
As fuel injection took over and precise control of fuel delivery became the norm rather than the exception, EGR started to disappear as DFCO and other operational strategies made EGR unnecessary.
It may see a comeback in the future (EGR) as an essential component of engine power control. Development of HCCI engines has seen significant increases in EGR use.
regards
Mech
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