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The Terminator
Terminator Talk
Belt length - 3.5 and 3.25 Whipple pulley
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<blockquote data-quote="Roush6018" data-source="post: 16984303" data-attributes="member: 78571"><p>you need to measure your ALT pulley diameter too. i have a J2 FAB alt , stock lower, stock upper on a eaton and billet idilers. i tried the stock size belt. it didnt work, too tight, but it showed me if i needed shorter or longer. you can install a supercharger belt too tight, you need to check that your tensioner is in the middle of the notch with a NEW belt installed, after 2k-3k miles the belt is worn in and could show different on the tensioner notch. </p><p></p><p>so the stock eaton pulley is 3.65" and you should find a belt to work with your 3.5" pulley first. so find the P/N on your current belt and then order the next size shorter belt to see how it works with your 3.5" pulley. install the shorter belt and check the tensioner notch. if its too loose then try the next size shorter belt. install the next shorter belt with your 3.5" pulley and then check the tensioner notch, if its good then you found the right size. </p><p></p><p>the stock cobra belt is Gates 080751 this is a 75.08" belt </p><p>my car is perfect with a Gates 080765 is a 76.50" belt. (on the LMR chart 77" link)</p><p>The LMR website is where i found this, they have a great chart!!!!!!!</p><p>you should try a 74" belt first the Gates 080740</p><p> (when using the LMR chart , choose the 74.50" link) (080740)</p><p> (if you choose the 74" link it will order you a 73.5" belt) (080734)</p><p></p><p></p><p>so my car needed a 1.5" longer belt with my J2 alt (stock 03 cobra ALT pulley ) and some billet idilers. stock upper and stock lower.</p></blockquote><p></p>
[QUOTE="Roush6018, post: 16984303, member: 78571"] you need to measure your ALT pulley diameter too. i have a J2 FAB alt , stock lower, stock upper on a eaton and billet idilers. i tried the stock size belt. it didnt work, too tight, but it showed me if i needed shorter or longer. you can install a supercharger belt too tight, you need to check that your tensioner is in the middle of the notch with a NEW belt installed, after 2k-3k miles the belt is worn in and could show different on the tensioner notch. so the stock eaton pulley is 3.65" and you should find a belt to work with your 3.5" pulley first. so find the P/N on your current belt and then order the next size shorter belt to see how it works with your 3.5" pulley. install the shorter belt and check the tensioner notch. if its too loose then try the next size shorter belt. install the next shorter belt with your 3.5" pulley and then check the tensioner notch, if its good then you found the right size. the stock cobra belt is Gates 080751 this is a 75.08" belt my car is perfect with a Gates 080765 is a 76.50" belt. (on the LMR chart 77" link) The LMR website is where i found this, they have a great chart!!!!!!! you should try a 74" belt first the Gates 080740 (when using the LMR chart , choose the 74.50" link) (080740) (if you choose the 74" link it will order you a 73.5" belt) (080734) so my car needed a 1.5" longer belt with my J2 alt (stock 03 cobra ALT pulley ) and some billet idilers. stock upper and stock lower. [/QUOTE]
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Belt length - 3.5 and 3.25 Whipple pulley
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