SR20 T25 whistle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sb253 · 06-09-2008, 05:52 PM

hey all,

So within the last week or so ive noticed when I let off the gas under boost I hear a whistle-like sound. I hear my BOV(Blitz DD) and the usual compressor surge, but there is a whistle noise coming from the engine bay too. Ive searched but have only found "turbo whistle" problems while accelerating but not when letting off the gas. Ive done a visual of my IC piping and everything LOOKS ok. I've also cleaned the piston in my BOV but its still doing it.

It doesn't do it when I just rev the motor so its hard to pin point where its coming from.

Has anyone had this problem before? Im just curious if its a turbo related problem or an air leak somewhere.

thanks,

SB

Moon Ill · 06-09-2008, 05:56 PM

Where is your BOV vacuum reference? My Greddy Type-RS whistles when I let off the gas pedal.

It's reference is the intake manifold.

GSXRJJordan · 06-09-2008, 05:56 PM

Could be an air leak. Do you have a boost gauge? I know that whenever I have a leak, I "feel" or "hear" it first, then look to the boost gauge to look for changes in how it's "acting".

Could also be a high frequency vibration. Dipsticks like to wiggle when they're not in all the way.

It sounds like something to keep an ear on, but unless it changes pitch/volume/etc, don't worry too much about it.

YoungGun · 06-09-2008, 05:58 PM

It's a boost leak, does it sound like a supercharger? Look at the bov flange and make sure your gasket is thick enough that's where mine was. Good luck.
I had the same problem btw.

TURBOMAN · 06-09-2008, 06:17 PM

Due a boost leak test. Water and Dish soap works great to find leaks. mixed it in a spray bottle and spray your couplers and B.O.V. Flange.

sb253 · 06-09-2008, 07:17 PM

Yeah I have a boost gauge and the readings are not out of the ordinary. And yeah, it does sound like a supercharger but only for a quick second when I let off the gas.

Kind of sounds like a hawk call

http://fsc.fernbank.edu/Birding/bird_sounds/rtha.mp3

thanks for the info. Ill check my BOV for leaks here in a minute

smokey240sx · 06-10-2008, 05:45 AM

your turbo sucked in a bird!

06-09-2008, 05:52 PM	#1
sb253 Zilvia Member Join Date: Mar 2004 Location: WA Posts: 286 Trader Rating: (0) Feedback Score: 0 reviews	SR20 T25 whistle hey all, So within the last week or so ive noticed when I let off the gas under boost I hear a whistle-like sound. I hear my BOV(Blitz DD) and the usual compressor surge, but there is a whistle noise coming from the engine bay too. Ive searched but have only found "turbo whistle" problems while accelerating but not when letting off the gas. Ive done a visual of my IC piping and everything LOOKS ok. I've also cleaned the piston in my BOV but its still doing it. It doesn't do it when I just rev the motor so its hard to pin point where its coming from. Has anyone had this problem before? Im just curious if its a turbo related problem or an air leak somewhere. thanks, SB

06-09-2008, 05:56 PM	#3
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	Could be an air leak. Do you have a boost gauge? I know that whenever I have a leak, I "feel" or "hear" it first, then look to the boost gauge to look for changes in how it's "acting". Could also be a high frequency vibration. Dipsticks like to wiggle when they're not in all the way. It sounds like something to keep an ear on, but unless it changes pitch/volume/etc, don't worry too much about it. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

06-09-2008, 05:56 PM	#2
Moon Ill Zilvia Member Join Date: Jan 2007 Location: Fayetteville, NC Age: 38 Posts: 206 Trader Rating: (1) Feedback Score: 1 reviews	Where is your BOV vacuum reference? My Greddy Type-RS whistles when I let off the gas pedal. It's reference is the intake manifold.

06-09-2008, 05:58 PM	#4
YoungGun Post Whore! Join Date: Nov 2007 Location: 818-951 SoCal Posts: 3,961 Trader Rating: (23) Feedback Score: 23 reviews	It's a boost leak, does it sound like a supercharger? Look at the bov flange and make sure your gasket is thick enough that's where mine was. Good luck. I had the same problem btw.

06-09-2008, 06:17 PM	#5
TURBOMAN Leaky Injector Join Date: Apr 2008 Location: Houston, TX Age: 38 Posts: 88 Trader Rating: (0) Feedback Score: 0 reviews	Due a boost leak test. Water and Dish soap works great to find leaks. mixed it in a spray bottle and spray your couplers and B.O.V. Flange.

06-09-2008, 07:17 PM	#6
sb253 Zilvia Member Join Date: Mar 2004 Location: WA Posts: 286 Trader Rating: (0) Feedback Score: 0 reviews	Yeah I have a boost gauge and the readings are not out of the ordinary. And yeah, it does sound like a supercharger but only for a quick second when I let off the gas. Kind of sounds like a hawk call http://fsc.fernbank.edu/Birding/bird_sounds/rtha.mp3 thanks for the info. Ill check my BOV for leaks here in a minute

06-10-2008, 05:45 AM	#7
smokey240sx Leaky Injector Join Date: Jul 2005 Location: PA Posts: 77 Trader Rating: (2) Feedback Score: 2 reviews	your turbo sucked in a bird!