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SVT Shelby GT500
Have some questions about BPS idlers/setup
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<blockquote data-quote="SCGallo2" data-source="post: 16446581" data-attributes="member: 160791"><p>I have no experience with BPS lightweight pulleys, but I believe GT Premi installed the full set on his GT500. For a 2.9L Whipple with a stock lower, 3.00" upper, and stock length belt, use a 90mm idler and no aux idler. With a Gen 4, you will see 18-20#s of boost with upper only depending on supporting mods and RPM, probably higher if spinning past 6500 RPM. I recommend speaking with your Tuner to see what pulley combo they recommend for the application and type of fuel you will be running before purchasing a new lower balancer. Personally, I prefer the clean look without an aux idler, and when I removed it years ago the bolts were working loose. My new Whipple has been installed since January, but I haven't been able to take my car to my Tuner for a dyno tune revision... maybe in the next couple of weeks. Here is a 3.00" upper with 90mm idler... plenty of belt wrap:</p><p></p><p>[ATTACH=full]1649168[/ATTACH]</p></blockquote><p></p>
[QUOTE="SCGallo2, post: 16446581, member: 160791"] I have no experience with BPS lightweight pulleys, but I believe GT Premi installed the full set on his GT500. For a 2.9L Whipple with a stock lower, 3.00" upper, and stock length belt, use a 90mm idler and no aux idler. With a Gen 4, you will see 18-20#s of boost with upper only depending on supporting mods and RPM, probably higher if spinning past 6500 RPM. I recommend speaking with your Tuner to see what pulley combo they recommend for the application and type of fuel you will be running before purchasing a new lower balancer. Personally, I prefer the clean look without an aux idler, and when I removed it years ago the bolts were working loose. My new Whipple has been installed since January, but I haven't been able to take my car to my Tuner for a dyno tune revision... maybe in the next couple of weeks. Here is a 3.00" upper with 90mm idler... plenty of belt wrap: [ATTACH=full]1649168[/ATTACH] [/QUOTE]
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Have some questions about BPS idlers/setup
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