Howling Noise

[lilmartian09]

While im driving normally around 2k rpm the car starts to make this howling noise. Intake and intercooler is all stock except the air filter & I have the bosch BOV. When I lift off the throttle it kinda makes this short release of pressure but it sounds ugly. I wish I could get a vid but I dont think Ill get a good enough sound. If I go past that rpm or under it it doesnt make that sound. I did ask my auto tech teacher and he says its a vortex thats being created but Idk. What do you guys think. Thanks :icon_bigg

 

[hvyman]

Sounds like your teacher is not so smart.

Is it in any gear and in neutral?

 

[lilmartian09]

Yes in gear. No neutral. My teacher is pretty good tho. He was a mechanic for the drag Venom mk4 supra

 

[lilmartian09]

So I guess no one gots an answer. Maybe upgrading the intercooler might make a difference

 

[CyFi6]

The Bosch bpv makes a "hooting" or "howling" noise at part throttle, right around 0 psi on the vacuum gauge. Swap that Bosch for a stock valve and see if it goes away.

 

[toyotanos]

If you take a video and it captures the sound right, I think either I or member Emiliorescigno could confirm whether its the bosch diverter valve noise- I commented on how his sounded at part throttle/tip-in and he said it was the bosch.