Strange sound on moderate acceleration
Newbie here. I ran several searches, but could not find any posts directly related to these concerns.
I just bought a 2005 WRX with 26K miles for my wife. It has some mods on it that I am trying to better understand, and an annoying noise I am trying to identify.
Turbo XS UTEC (pn# WRX-UTEC-US)
Turbo XS UTEC Switch
K&N Typhoon short ram intake (pn# 69-8001)
The car runs well, and the installer dyno’d the car at 227hp at the wheels. But it has a strange (to me) noise. At about 3K RPM under moderate acceleration I get an annoying noise similar to a vacuum leak, or like a secondary carb barrel(s) opening up (I'm showing my age). I cannot reproduce the noise when the car is stationary. There has to be moderate engine load. I also get a “Burp” on decel (I assume this is excess boost pressure being bled off, but don’t know).
I am also trying to figure out what the switch settings mean, and how it should, and should not be used. The gentlemen I bought it from is suffering from a terminal health issue, and did not remember what each switch setting was for.
Thanks for any help you all can provide. I am an old car guy, but tuning modern turbo cars is a whole new world to me.