i went to Church Automotive on Friday to have my car tuned again. the last time i dynoed it, i had a cat. converter which was very restrictive. now, with a Megan test pipe i gained 23hp and 9tq. but now my boost is reading at 13psi

my understanding, this isnt too safe on a stock block. besides a bigger pulley and not red lining my car, what can i do to lower boost?

ps. my current mods are in my sig

 

lower the compression

 

You must have recieved the wrong pulley.

I didn't think you could "overboost" on a supercharger, only turbos had this problem...

 

4.5in pulley?

 

i think he has a 3.25in pulley

 

4.5" is stock.

Hope it wasn't a 3.5" as thats what I fitted to mine the other day, got to be smaller like 3"

 

lower the compression? different head gasket?

 

yea new head gasket. im boosting 11psi at 9200 and my asp pulley is 3.875", which i thought would make less boost. every car is differnt.

 

so then which headgasket?

2mm or 3mm?

InLinePro has them, right?

 

I've seen you made that comment couple times. Can you explain why its different from car to car(or base on what circumstances). For argument sake, lets talk about the same brand pulley, with a S/C(say no aftercooler system).

I know that if people have a FMIC, the piping will change the boost level. But if you have a S/C system, wouldn't it all be the same, since the volume of air to fill in the pipe is the same for all S/C