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SVT Shelby GT500
Question about L&M twin 72mm throttle body
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<blockquote data-quote="Catmonkey" data-source="post: 16691712" data-attributes="member: 124025"><p>First off, you're looking at a 44% increase in effective throttle area. It needs a tune. Anyone who tunes your car will be starting from scratch for a tune revision, unless you can find the original tuner that can put his hands on your tune file.</p><p></p><p>According to VMP's deep dive into throttle bodies, the Ford actuator motor is on the small side to properly control the throttle blades on larger throttle bodies. One issue they cite is the high engine vacuum with the stock cams. They had a 72mm at one time and took it off the market. The largest twin they market today is a 69mm. I have not heard any complaints on this throttle body and their 67mm has a proven track record as to reliability.</p><p></p><p>You may find someone to tune it, but it might be in for a long painful search with no guaranty it will ever run right. If this is primarily a street car, I'd pick something smaller and forego the small power pick up at redline. Tuner's are not interested in dealing with continual tune tweaks that are not worth their time and effort, so you may have a hard time finding someone is willing to touch it. Then again, you may find someone that nails it.</p><p></p><p>The 69mm is still a 32% increase in ETA, BTW. FWIW, a 65mm or a 67mm can run okay without tune revisions. It will run better with a tune, but it's an alternative to retuning the car.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16691712, member: 124025"] First off, you're looking at a 44% increase in effective throttle area. It needs a tune. Anyone who tunes your car will be starting from scratch for a tune revision, unless you can find the original tuner that can put his hands on your tune file. According to VMP's deep dive into throttle bodies, the Ford actuator motor is on the small side to properly control the throttle blades on larger throttle bodies. One issue they cite is the high engine vacuum with the stock cams. They had a 72mm at one time and took it off the market. The largest twin they market today is a 69mm. I have not heard any complaints on this throttle body and their 67mm has a proven track record as to reliability. You may find someone to tune it, but it might be in for a long painful search with no guaranty it will ever run right. If this is primarily a street car, I'd pick something smaller and forego the small power pick up at redline. Tuner's are not interested in dealing with continual tune tweaks that are not worth their time and effort, so you may have a hard time finding someone is willing to touch it. Then again, you may find someone that nails it. The 69mm is still a 32% increase in ETA, BTW. FWIW, a 65mm or a 67mm can run okay without tune revisions. It will run better with a tune, but it's an alternative to retuning the car. [/QUOTE]
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Question about L&M twin 72mm throttle body
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