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SVT Shelby GT500
Guess the numbers
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<blockquote data-quote="99cobraUgotbit" data-source="post: 14712687" data-attributes="member: 18423"><p>What octane and degree of timing on old set up would best answer the question. Also No headers make your numbers seem way to high. </p><p></p><p>I had the exact same combo with a 2.5 as your old set up did but with headers (stock elbow/stock tb) and had it dyno tuned. Tuner had me at </p><p>19* of timing and put down 677rwhp and 696rwtq @ 16psi on 91 pump. The duty cycle was at 70% and a/f was at 12.0. Was running very hard but the high timing and low octane kept blowing out the 02 sensors. </p><p></p><p>Vmp sent me a email tune to get me to Shelby fest. Justin dyno tuned me at 15* for 629/623. A safe tune and very reliable. Must say I was pleased. So obviously higher octane and timing make a huge difference</p><p></p><p>I also recently installed vmp 67mm throttle body and vmp high flow elbow with a 2.4 pulley. have not returned to the dyno. But will be hard to figure gains because I won't make it back to vmps dyno in florida. None the less the new mods made a huge difference!</p></blockquote><p></p>
[QUOTE="99cobraUgotbit, post: 14712687, member: 18423"] What octane and degree of timing on old set up would best answer the question. Also No headers make your numbers seem way to high. I had the exact same combo with a 2.5 as your old set up did but with headers (stock elbow/stock tb) and had it dyno tuned. Tuner had me at 19* of timing and put down 677rwhp and 696rwtq @ 16psi on 91 pump. The duty cycle was at 70% and a/f was at 12.0. Was running very hard but the high timing and low octane kept blowing out the 02 sensors. Vmp sent me a email tune to get me to Shelby fest. Justin dyno tuned me at 15* for 629/623. A safe tune and very reliable. Must say I was pleased. So obviously higher octane and timing make a huge difference I also recently installed vmp 67mm throttle body and vmp high flow elbow with a 2.4 pulley. have not returned to the dyno. But will be hard to figure gains because I won't make it back to vmps dyno in florida. None the less the new mods made a huge difference! [/QUOTE]
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