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Cobra Forums
2013-14 Shelby GT500
20 PSI
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<blockquote data-quote="PhoenixM3" data-source="post: 16290435" data-attributes="member: 140283"><p>My thought is that you should be very careful at that boost level because it doesn't sound like you know anything about the existing tune. These motors are very costly to bend. High RPM is (one of many) killers of all things rotating, so consider limiting yours to about 6K. The stock rods in this motor aren't very robust, but this motor lives comfortably at 100HP over stock, many owners have gone higher. </p><p></p><p>My guess is that you're right regarding a previous owner changed the upper pulley. Someone will very likely post the diameter of the stock pulley, but you should measure yours to better understand what you have and/or post photos of the upper and lower pulleys (I'm not sure if the boost gauge is all that accurate, or if you could even reach 20PSI on only an upper pulley swap). To lower the boost a little, you could install some LTH, or swap back to a stock pulley.</p></blockquote><p></p>
[QUOTE="PhoenixM3, post: 16290435, member: 140283"] My thought is that you should be very careful at that boost level because it doesn't sound like you know anything about the existing tune. These motors are very costly to bend. High RPM is (one of many) killers of all things rotating, so consider limiting yours to about 6K. The stock rods in this motor aren't very robust, but this motor lives comfortably at 100HP over stock, many owners have gone higher. My guess is that you're right regarding a previous owner changed the upper pulley. Someone will very likely post the diameter of the stock pulley, but you should measure yours to better understand what you have and/or post photos of the upper and lower pulleys (I'm not sure if the boost gauge is all that accurate, or if you could even reach 20PSI on only an upper pulley swap). To lower the boost a little, you could install some LTH, or swap back to a stock pulley. [/QUOTE]
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2013-14 Shelby GT500
20 PSI
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