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SVT Shelby GT500
VMP Gen 3 Thoughts
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<blockquote data-quote="Justin@VMP" data-source="post: 16305489" data-attributes="member: 18468"><p>I will also speak to a couple of the installation and tuning comments...</p><p></p><p>The 2650 rotors housed within the VMP Gen3 and Gen3R are around 5mm larger in diameter and 5mm longer in length. Whereas the STB was very close with a 2300, its a no-go with a 2650. Not too big of a deal since the GT500 has not had one since 2010. Overall, the rotors are short and fat compared to other blower upgrades, it's tight in a few places, but its well worth it for the efficiency that the 2650 brings.</p><p></p><p>The boostcurve of the 2650 is a little different than the 2300. We're pulleying them up 3-4 sizes to see the same PEAK boost, but we don't have some of the negatives of the 2300, so we're really only going up 2-3 sizes. The 2300 hits really really hard, and then it falls on its face. It's hard to understand this UNTIL you have a 2650. The 2650 comes on hard around 4k and never stops pulling. Whereas the 2300 boost curve was very flat, the 2650 will make 1-2psi more up top. This is not a bad thing, the engine can tolerate more boost at higher RPM when the piston speed is up. Since you are continuing to accelerate faster and faster they still love timing. </p><p></p><p>Other notes about the Gen3R vs Gen3...when you get into small uppper and overdrive lower pulley combos the R will make 1-2psi more than regular 3 due to how much better the inlet is. On a stock motor GT500 with a 2.4 upper only combo the R makes around 30rwhp more than the old Gen3. I can tell you from installing and dynoing a ton of these at VMP, the R consistently makes more power on average than the regular 3 given the same combo on a stock motor. Built motor combos will see 100rwhp over the 3 with our best R model, competing with blowers over a liter larger in size. All while still fitting under the stock hood, and weighing only 45lbs vs some of the big liter blowers which weigh in at 70lbs. </p><p></p><p>When we install these, we don't use washers. For some novice's at home, I can easily see them falling into injector holes and taking out a motor. We are making some changes to the EVAP arrangement on the back for 07-10 cars that still use a line, unlike 11-14 which have a valve bolted directly to the elbow.</p></blockquote><p></p>
[QUOTE="Justin@VMP, post: 16305489, member: 18468"] I will also speak to a couple of the installation and tuning comments... The 2650 rotors housed within the VMP Gen3 and Gen3R are around 5mm larger in diameter and 5mm longer in length. Whereas the STB was very close with a 2300, its a no-go with a 2650. Not too big of a deal since the GT500 has not had one since 2010. Overall, the rotors are short and fat compared to other blower upgrades, it's tight in a few places, but its well worth it for the efficiency that the 2650 brings. The boostcurve of the 2650 is a little different than the 2300. We're pulleying them up 3-4 sizes to see the same PEAK boost, but we don't have some of the negatives of the 2300, so we're really only going up 2-3 sizes. The 2300 hits really really hard, and then it falls on its face. It's hard to understand this UNTIL you have a 2650. The 2650 comes on hard around 4k and never stops pulling. Whereas the 2300 boost curve was very flat, the 2650 will make 1-2psi more up top. This is not a bad thing, the engine can tolerate more boost at higher RPM when the piston speed is up. Since you are continuing to accelerate faster and faster they still love timing. Other notes about the Gen3R vs Gen3...when you get into small uppper and overdrive lower pulley combos the R will make 1-2psi more than regular 3 due to how much better the inlet is. On a stock motor GT500 with a 2.4 upper only combo the R makes around 30rwhp more than the old Gen3. I can tell you from installing and dynoing a ton of these at VMP, the R consistently makes more power on average than the regular 3 given the same combo on a stock motor. Built motor combos will see 100rwhp over the 3 with our best R model, competing with blowers over a liter larger in size. All while still fitting under the stock hood, and weighing only 45lbs vs some of the big liter blowers which weigh in at 70lbs. When we install these, we don't use washers. For some novice's at home, I can easily see them falling into injector holes and taking out a motor. We are making some changes to the EVAP arrangement on the back for 07-10 cars that still use a line, unlike 11-14 which have a valve bolted directly to the elbow. [/QUOTE]
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