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2013-14 Shelby GT500
Help with a tune
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<blockquote data-quote="Catmonkey" data-source="post: 16617386" data-attributes="member: 124025"><p>Generally the the bigger the throttle body, the more power you'll make, even if it's at the peak. If you're buying new, these TBs go on sale a few times a year. If you can save a few coins, great. I have no issues with that. I'm sure they also pop up used from time to time too. My 67mm is 8 years old, so they've been around a while. </p><p></p><p>Is 2mm worth $90 to me? I would say yes and it's really 2mm times 2. For me, I've owned a 67mm for 8 years now, so upgrading would cost more than $90. I already have a now discontinued 72mm on the shelf I want to tackle tuning next, regardless. In terms of throttle area, the 67mm is 6% larger than the 65mm. The 69mm is another 6% larger than the 67mm. You could be looking at a 75 to 100 cfm increase over each size increment, or 150 to 200 cfm with the 69mm over the 65mm. </p><p></p><p>I believe VMP was looking to manufacture the largest dual throttle body they could make that the OEM motor could still reliably operate and control. Not having run one, I don't know if it has any quirks from a tuning perspective. It just seems like the logical choice to me, if I were shopping throttle bodies today. For all I know the 69mm may not clear the stock elbow. OP would need to research that aspect.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16617386, member: 124025"] Generally the the bigger the throttle body, the more power you'll make, even if it's at the peak. If you're buying new, these TBs go on sale a few times a year. If you can save a few coins, great. I have no issues with that. I'm sure they also pop up used from time to time too. My 67mm is 8 years old, so they've been around a while. Is 2mm worth $90 to me? I would say yes and it's really 2mm times 2. For me, I've owned a 67mm for 8 years now, so upgrading would cost more than $90. I already have a now discontinued 72mm on the shelf I want to tackle tuning next, regardless. In terms of throttle area, the 67mm is 6% larger than the 65mm. The 69mm is another 6% larger than the 67mm. You could be looking at a 75 to 100 cfm increase over each size increment, or 150 to 200 cfm with the 69mm over the 65mm. I believe VMP was looking to manufacture the largest dual throttle body they could make that the OEM motor could still reliably operate and control. Not having run one, I don't know if it has any quirks from a tuning perspective. It just seems like the logical choice to me, if I were shopping throttle bodies today. For all I know the 69mm may not clear the stock elbow. OP would need to research that aspect. [/QUOTE]
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2013-14 Shelby GT500
Help with a tune
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