when im in boost. my boost gauge is maxed out at 10. i didnt think a stock pulley puts out that much boost. any ideas? car is completely stock except shorty headers and exhaust. pulley measures approx 3.8"

 

well i measured my lower crank pulley and it measures a little over 9". so with the stock supercharger pulley 3.65" looks like im running about 12.9 psi of boost based on this website http://www.stangshiftergaskets.com/2...m#_Toc35092344 so it looks like i may need a dyno tune to make sure my a/f ratio is okay. is there a way to tell if my car has been tuned for the lower crank pulley??????????????

 

Factory Boost should be around 8 psi! ....Put an aftermarket gauge in there to test the Boost!

 

but my car also has a larger crank pulley. looks to be a metco. measures 9.1" which would increase boost. rite??

 

Correct ^^^^ ...bigger crank pulley creates more boost!!

 

I was wondering about this also. I knew that 8psi was stock. My needle max out to 10. I might need to check my lower pulley.

 

Same exact **** happened to me