How much boost will my Impreza handle?
This of course depends on the setup. I didn’t originally have an intercooler so I could only run about 7 pounds before hearing any kind of detonation. Realize this is on a 1.8L with 9.5:1 compression. Your results will vary depending on location. To keep it safe, I would recommend keeping it at 5 pounds until you can get some sort of electronics or SAFC to change the fuel ratio and an intercooler to get the intake temperatures down.
