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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Whipple Gen 4 install w/ JDM 650HP upgrade
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<blockquote data-quote="MTF" data-source="post: 1360409" data-attributes="member: 499"><p>Too many factors to say you would need to retune, but typically going one to two steps in size either way, would not require a retune.</p><p>I have all three sizes 3.625, 3.500, 3.375</p><p>Whipple's Tuner didn't want me to try the 3.250 because I may have to much back pressure and heat, I could possibly ruin the cats.</p><p>Keep in mind I only have the Gen 2 compressor, when I upgrade to the Gen 4, I'll have more knowledge.</p><p></p><p>If your not doing the Oil Pump Gears you will need to play it safe as well.</p><p>With JDM's tune and a the smaller Throttle Body ( Twin 65mm TB ) you're probably safe to try smaller pulleys.</p><p></p><p>I would order the 3.500 if your going to put her on a dyno and check things out.</p><p>You can always order more pulley's.</p><p></p><p>You have to understand Whipple is not going to sell a product that could potentially harm your engine, so they are going to play it safe.</p><p>I've been the guinea pig for quite a while in the very beginning, lately I haven't been in the game.</p><p>When I do, I will go up to the 3.500 for the first few runs and go back down to the 3.375</p></blockquote><p></p>
[QUOTE="MTF, post: 1360409, member: 499"] Too many factors to say you would need to retune, but typically going one to two steps in size either way, would not require a retune. I have all three sizes 3.625, 3.500, 3.375 Whipple's Tuner didn't want me to try the 3.250 because I may have to much back pressure and heat, I could possibly ruin the cats. Keep in mind I only have the Gen 2 compressor, when I upgrade to the Gen 4, I'll have more knowledge. If your not doing the Oil Pump Gears you will need to play it safe as well. With JDM's tune and a the smaller Throttle Body ( Twin 65mm TB ) you're probably safe to try smaller pulleys. I would order the 3.500 if your going to put her on a dyno and check things out. You can always order more pulley's. You have to understand Whipple is not going to sell a product that could potentially harm your engine, so they are going to play it safe. I've been the guinea pig for quite a while in the very beginning, lately I haven't been in the game. When I do, I will go up to the 3.500 for the first few runs and go back down to the 3.375 [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Whipple Gen 4 install w/ JDM 650HP upgrade
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