Audi's GT racing team took 1, 2 and 4th position at Le Mans a few years ago running af/ratio between 13.6-16:1 on their turbocharged FSI engine.
The special piston top make the incoming charge tumble vertically, the need to run rich a/f ratio is no longer needed. Needless to say, it was fast and economical - also win races :razz:
If anyone is interested, I will dig out the article and scan it to the board.
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Richard L
aquamist technical support
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