phlip wrote:
Thats funny. Reading one of the links in your sig it says never adjust the spring tension of the AFM. Adjusting the spring tension of the AFM is how I went from 128 to 139 horsepower in less then an hour of dyno time. It's also how I've got dozens of pre-OBD2 cars equiped with AFM's to pass state emission tests.
I'm dubious. That's a helova lot of hp increase. Rigorously testing engine management changes via dyno runs is not infantry simple. It's hard for me to buy that Porsche left 11hp on the table that could have been recovered with a few spring clicks.
At a minimum, a careful analysis would have to be done re. what was changing (F/A, spark advance, etc.) in good runs vs. bad runs, and it would have to be repeated multiple times to confirm causality. Once can't just twiddle something, do another run and exclaim "wow, 11hp. Time to go home".