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2013-14 Shelby GT500
Octane requirements
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<blockquote data-quote="cluscher" data-source="post: 12372089" data-attributes="member: 77910"><p>Because of knock sensors retarding spark advance, not because 93 octane itself performs better than 91 octane. My point is that if you put 91 or 93 in an 07-09 GT500 with a stock tune, which doesn't have knock sensors, the car will perform the same. The question becomes does the stock tune in the 13 rely on knock sensors to the extent that the knock sensors would retard spark advance with a difference of 2 octane in the tank. It seems this is what OP is trying to clarify. </p><p></p><p>The question for me is how far can the knock sensors go in altering performance and protecting the engine. Could you put 87 in the car and still be safe while in boost? Somebody here knows.</p></blockquote><p></p>
[QUOTE="cluscher, post: 12372089, member: 77910"] Because of knock sensors retarding spark advance, not because 93 octane itself performs better than 91 octane. My point is that if you put 91 or 93 in an 07-09 GT500 with a stock tune, which doesn't have knock sensors, the car will perform the same. The question becomes does the stock tune in the 13 rely on knock sensors to the extent that the knock sensors would retard spark advance with a difference of 2 octane in the tank. It seems this is what OP is trying to clarify. The question for me is how far can the knock sensors go in altering performance and protecting the engine. Could you put 87 in the car and still be safe while in boost? Somebody here knows. [/QUOTE]
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2013-14 Shelby GT500
Octane requirements
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