DonS4

It's only audible in low rpm's and low gears and when the engine is cold. When the engine warms up, the siren sound turns into the normal turbo whine sound. I never heard the siren sound before, so this is a little troubling. Should I be worried?

NickS

You're sure it's the "siren" sound and not the louder turbo spooling sound you get with the chip??

RocknRoll

the turbos are much louder. I have yet to hear a "siren" sound but the turbos are much more audible now with the chip. Maybe find someone close with a chip and compare, it might just be normal with the added boost application!?

DonS4

I'm guessing that it's the siren sound since it sounds like a siren, but I must admit that I've never heard what the siren sound sounds like. And it does disappear (morphs into the normal turbo whine sound) once the oil temperature goes up.

Mike@VAST

don't be worried...people, stop being so paranoid.

pbs12345

no problems so far. I am sure it is just the cold turbos spooling. I keep it under 3k until oil temp moves off 150

NickS

If it sounds like a whistle or high pitch, it's the turbos spooling up. If it sounds like a police siren, then that is obviously the "siren" sound.

DonS4

You work at Loud Cloud right? That's just a few blocks from where I work (VeriSign). Mind if I listen to your turbos?

RocknRoll

What if it sounds like a truck backing up(beep beep beep)? is that good or bad?

KAOS, AZ (Papa Smurf)

The turbos have a substantial amount of low end boost compared to stock. Also, the oil temps are cold, as they heat the noise goes away. Perfectly normal on my end. It is not the dreaded siren noise that people hear when their turbos are getting ready to quit. You're hearing spooling.