Charles Law is right. As my old engineering prof sagely said "For every complex design problem there will be several answers which are simple, elegant, and wrong."
The Ram air induction method is generally considered to be incrementally valuable above around 80MPH, provided you can get the intake up past the boundary layer. Hard to do on a 911 without looking absurd.
I'm keen for improvements on my 85, as well. Does anyone knows of a good source of tuning/setup info for the Motronic DME?? I'm thinking that 15 years of wear and accumulated gunk around the inlet airflow meter be degrading performance. Someone recently posted about having detected a severe over-rich condition due to loss of airflow meter spring tension. He claimed a really significant improvement by re-tensioning the spring [there is a ratchet adjucter in the air meter], leaning out the [sealed] mixture preset from three turns factory setting to eleven turns, and adjusting the idle to suit the new settting. Sounded like trial and error.
I'd really like to get the induction side of the engine restored to ex-factory-like condition, adn would not be surprised to pick up some of the HP lost to wear and gunk over the years in the process.
Any one BTDT???
Tony K
85 Carrera
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