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2011-2014 Mustangs
Power-Adders
69mm VMP pulley...how much boost?
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<blockquote data-quote="corepwn" data-source="post: 14990249" data-attributes="member: 110539"><p>With a 69mm pulley and stock lower/blower combo I saw 13.5ish PSI. This also had a GT500 throttle body.</p><p>Using a 100mm Metco idler I didn't see any slip but honestly I only ran that pulley for MAYBE 2 street pulls before going back to a larger pulley.</p><p></p><p>Another thing to consider is that the pulley itself is only one of the variables which is why a 69mm will work fine for some and not others.</p><p>What I mean by this is that if you're running more boost for a given pulley size for any reason, the friction requirements of the belt become higher on the same size pulley to not slip.</p><p></p><p>8 rib <strong><u>is</u></strong> the best long term solution, but I stayed 6 rib for now. I calculated and found that by using the mosaleen idler, the amount of belt surface area I'd have with the 6 rib on my 75mm upper pulley would be roughly equivalent to the 8 rib conversion's belt area. After installing this idler I don't see the slip in my datalogs that I had on my test hit at the track at this boost level.</p></blockquote><p></p>
[QUOTE="corepwn, post: 14990249, member: 110539"] With a 69mm pulley and stock lower/blower combo I saw 13.5ish PSI. This also had a GT500 throttle body. Using a 100mm Metco idler I didn't see any slip but honestly I only ran that pulley for MAYBE 2 street pulls before going back to a larger pulley. Another thing to consider is that the pulley itself is only one of the variables which is why a 69mm will work fine for some and not others. What I mean by this is that if you're running more boost for a given pulley size for any reason, the friction requirements of the belt become higher on the same size pulley to not slip. 8 rib [B][U]is[/U][/B] the best long term solution, but I stayed 6 rib for now. I calculated and found that by using the mosaleen idler, the amount of belt surface area I'd have with the 6 rib on my 75mm upper pulley would be roughly equivalent to the 8 rib conversion's belt area. After installing this idler I don't see the slip in my datalogs that I had on my test hit at the track at this boost level. [/QUOTE]
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Power-Adders
69mm VMP pulley...how much boost?
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