|
The original purpose of EGR was to reduce NOX emissions which skyrocket when peak combustion camber temperatures rise above around 3300 degrees. In 1976 California required EGR on the 280Z (Nissan-Datsun), while the Federal emissions versions did not reuqire EGR, but the compression ratios on those early EFI engines was about 8.5 to 1.
To a degree adding EGR will increase efficiency, but mapping the amount, to specific load conditions could get tricky. I really requires precision controls and a dedicated ECU response to really cover all of the parameters.
If you can get precise instsntaneous mileage readings and be able to adjust the flow of EGR based on the gains in mileage you may be able to make it work. Making it work automatically may be quite a project.
regards
Mech
|