Topgear A12 Turbo

Revision as of 06:27, 7 March 2008; view current revision
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Topgear turbo'd an A12 engine and it was a great learning experience. He went from 33 rear-wheel horespower to 128.

• Before: 33 rwhp (very typical for a stock A12 engine)

  

  Air-fuel ratio was extremely rich at 10.2-11.7. Optimum max power is around 12.5 for a naturally aspirated gasoline engine. Max economy is above 14.7:1.

• After: 128 rwhp

  

  Air-fuel ratio was near perfect for a turbo engine. Overly rich for max power with some cooling effect. Notice how flat the a/f curve is (lower lines).