Join Date: Oct 2012
Location: Batten Roodje
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Yeah... because 1970s emissions controls had absolutely zero effect on the efficiency of those engines either. And we all know that removing emissions from later model vehicles has a negative effect on fuel economy...
The only - ONLY - time I've ever seen emissions have a positive effect on anything was with a mid-90s LT4 in an F-body w/ everything in the SLP Catalog thrown at it. Literally. Drag car with a license plate (barely). Exhaust started w/ SLP long tubes. We tried dumps, lakes, dual straights, x-pipe, h-pipe, and stock route Borla collector-back system; all in straight pipe and with cherry bombs. Exhaust design behind the Y-pipe (restricted by body design) is so poor and cylinder scavenging so hampered that the car made better power (chassis dyno confirmed) through the cats. Race cats, granted, but the car needed the backpressure. Much more area under the curve.
Otherwise I've never seen anything improve efficiency of an engine except internal design (reduced parasitic losses) or airflow enhancement. Emissions controls are never "enhancing" to airflow otherwise, so they'll always limit power and thus fuel economy. I'm calling BS on making emissions programming more restrictive having zero effect on real world fuel economy. Maybe in their imaginary 40mph "highway" simulation, but not where real people live and drive.
08 Resistol. Anarchy EFI, 5" TBE, Sinister coolant filter, Carbonite DP sensor, CSS -4" springs, reverse level, CalTracs, Amsoil bypass filter, Revmax VB/TCM, & a madly leaking radiator.