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Originally Posted by maxferran
That's odd, why do the GT3s not come with a 3.8? Anyway, the point is that all watercooled Porsche engines are plagued with the lottery even this fella's new Porsche.
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Porsche didn't need the extra displacement to hit their hp target. The 3.6L in the GT3 is highly tuned and has the highest hp/liter output of any mass produced naturally aspirated engine built ever. Even higher than anything coming from Italy. It has 415 hp compared to 355hp on the 3.8L giving it a hair over 115hp per liter. Even the 381hp X51 version of the 3.8L is less powerful than the 3.6L in the GT3. They used higher flowing heads/intake and extra high compression along with very trick, extremely light internals. It's a very special engine. The boxster and standard 911 engines are very detuned by comparison. My 258 hp 3.2L boxster only has about 81hp per liter for example. If it was tuned in a similar fashion as the GT3 motor it would have more like 368 hp!