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2013-14 Shelby GT500
10% Lower + 2.5 Upper on a '13
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<blockquote data-quote="Catmonkey" data-source="post: 15606322" data-attributes="member: 124025"><p>I'm just putting that combo together now. Haven't put a boost gauge in the car yet either, but I've got one on the shelf. I'm running a built 5.8 in a '12 with cams and running a ported VMP G2 and their new twin 72mm and long tubes without cats. I also have ID1000s and a BAP, so I'm not sure how well it would compare. My cams are not that aggressive, so I doubt it loses much boost from them. I did run the car with all this without the blower port and running 67mm TB before I started tearing it down to upgrade the chain drives and other components. I ordered another cam with a bit more duration so that's liable to change up the composition further.</p><p></p><p>I had an ATI stock balancer and a 2.4" upper, so I'm sure I was in the range of 18 psi, at a minimum. I had no traction in first or second and third gets sort of scary with 315s, so I figured reducing the boost wouldn't hurt anything. I just changed the shell on the balancer to the 10%. My thinking was with the adjustable hub, I'd have greater range of adjustability. I got a bigger belt and put a stock sized pulley on my Thump tensioner. I figure I'll probably end up with a 2650, so I'm sure I'll need an ever larger upper pulley. My old VMP Gen I came with 3 pullies and I have pullies up to 3". </p><p></p><p>The way I see it, the planets have to be in perfect alignment to run a 2.4" on a TVS with pump gas. Sure you can reduce your timing to boost it to 20 psi, but spinning the blower faster than you need still produces heat. Hot IAT2 just go to pull more timing. Granted we have knock sensors, but you never know how old the gas is at the gas station, and if it takes you a while to go through a tank of gas, just how much octane you have, or your car sits up in winter, there's not a lot of drawbacks running less than 18psi. I've already blown a head gasket with just a VMP Gen I and a 2.4" pulley, so I know these motors have their limitations. If you have traction issues to boot, it's just more win. If you track the car, an upper pulley swap is a snap with the adjustable hub. I think for a street setup, I'm going to continue increasing the upper pulley until it no longer feels like I'm running on wet pavement. With our annual rainfall, I'm just not comfortable running drag radials on the street. I also like pushing it in the corners.</p><p></p><p>Anyway that's my logic in this process. I'm sure I haven't installed my last pulley either.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 15606322, member: 124025"] I'm just putting that combo together now. Haven't put a boost gauge in the car yet either, but I've got one on the shelf. I'm running a built 5.8 in a '12 with cams and running a ported VMP G2 and their new twin 72mm and long tubes without cats. I also have ID1000s and a BAP, so I'm not sure how well it would compare. My cams are not that aggressive, so I doubt it loses much boost from them. I did run the car with all this without the blower port and running 67mm TB before I started tearing it down to upgrade the chain drives and other components. I ordered another cam with a bit more duration so that's liable to change up the composition further. I had an ATI stock balancer and a 2.4" upper, so I'm sure I was in the range of 18 psi, at a minimum. I had no traction in first or second and third gets sort of scary with 315s, so I figured reducing the boost wouldn't hurt anything. I just changed the shell on the balancer to the 10%. My thinking was with the adjustable hub, I'd have greater range of adjustability. I got a bigger belt and put a stock sized pulley on my Thump tensioner. I figure I'll probably end up with a 2650, so I'm sure I'll need an ever larger upper pulley. My old VMP Gen I came with 3 pullies and I have pullies up to 3". The way I see it, the planets have to be in perfect alignment to run a 2.4" on a TVS with pump gas. Sure you can reduce your timing to boost it to 20 psi, but spinning the blower faster than you need still produces heat. Hot IAT2 just go to pull more timing. Granted we have knock sensors, but you never know how old the gas is at the gas station, and if it takes you a while to go through a tank of gas, just how much octane you have, or your car sits up in winter, there's not a lot of drawbacks running less than 18psi. I've already blown a head gasket with just a VMP Gen I and a 2.4" pulley, so I know these motors have their limitations. If you have traction issues to boot, it's just more win. If you track the car, an upper pulley swap is a snap with the adjustable hub. I think for a street setup, I'm going to continue increasing the upper pulley until it no longer feels like I'm running on wet pavement. With our annual rainfall, I'm just not comfortable running drag radials on the street. I also like pushing it in the corners. Anyway that's my logic in this process. I'm sure I haven't installed my last pulley either. [/QUOTE]
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2013-14 Shelby GT500
10% Lower + 2.5 Upper on a '13
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