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Just put a boost gauge in and wanted to know when is the best time to get an accurate boost reading ? If i run it in first and second gear it reads about 9# in third and forth it reads 6# !?! Reason I want to know is im up'in the boost and I dont want to go to much over 10# !! Also does anyone know the stock pulley size on a vortech supercharger or does it vary depending on the factory boost from Vortech ?
 

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It should always be constant. Not Falling down.

Check for a boost leak or belt slip bro.

Mine stays a constant 10psi the entire time
 

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The stock pulley on a vortech without a charge cooler for a 96-98 mustang is 3.6". With the charge cooler it would come with a 3.33"
 
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