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The only way to be sure is to take it off. Can you get a mirror down in there and see if there are any markings on the pulley? Do you have a boost gauge? If so.....how many pounds of boost is the motor making?
The only way to be sure is to take it off. Can you get a mirror down in there and see if there are any markings on the pulley? Do you have a boost gauge? If so.....how many pounds of boost is the motor making?
Where are you located. seems like a lot of rust on your car. Make sure you get tons of penetrating oil and lube everything up before you start taking it apart.
That's an old Helix pulley. Looks like a 15% with the bolt spacing, and they are the most popular. I wouldn't worry about the rust on the screws at it's just surface rust.
