really weird turbo sounds - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

uiuc240 · 11-10-2002, 01:53 PM

Umm, so yeah. Last night I got in my car and started driving home and there was this light tapping sound under boost. I immediately got very scared. But as I tested some things, I found that it was ONLY related to boost...not rpm. I can rev the engine in neutral and there are no sounds.

So today, I went outside and did some investigating. Took the heat shield off, and the compressor outlet elbow and had me a look-see. Nothing special. All the gaskets are there and things look decent.

Now the sound has changed: It's like a screaming chicken is under my hood when I boost!!!!  I don't know what that means  

My main concern is that I won't damage my motor. I'm already in the process of buying an S14 BB turbo, but I'm not planning to put it in until May. So can I keep driving like this?

Please, I need your thoughts.:nervous:

Eric

GamblerZ · 11-10-2002, 03:49 PM

Boost leak?

Something caught in the turbo?

Wastegate problem?

Night Slide Josh · 11-10-2002, 07:06 PM

could also be your bov..
is it a screeching sound at partial throttle?

uiuc240 · 11-10-2002, 10:02 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Night Slide Josh @ Nov. 10 2002,8:06)</td></tr><tr><td id="QUOTE">could also be your bov..
is it a screeching sound at partial throttle?</td></tr></table><span id='postcolor'>
it doesn't matter what the throttle is, really.  if there's boost, there's crazy chicken sounds.  i'm almost positive it's a gasket.  i can hear and smell the evidence.  damn.  i didn't want to change this right now!!!

Eric

*drifterx* · 11-11-2002, 11:22 AM

check your seals around your BOV
last week i had the same problem with my eclipse but it happened that my BOV was becoming unfastened
i have the blitz BOV and i didnt tighten it enough

Foxcolt · 11-11-2002, 11:28 AM

Thats what I say to eric. I think it might be the seal that connects the BOV to the flange pipe. If that's the case a new gasket should be easy to come buy. Also try tightning the BOV. Maybe it's opening a little under boost.

Jed

uiuc240 · 11-11-2002, 01:53 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Foxcolt @ Nov. 11 2002,12:28)</td></tr><tr><td id="QUOTE">Thats what I say to eric. I think it might be the seal that connects the BOV to the flange pipe. If that's the case a new gasket should be easy to come buy. Also try tightning the BOV. Maybe it's opening a little under boost.

Jed</td></tr></table><span id='postcolor'>
you think so???  hmmm...i guess it could be that.  but it really does sound like an out-of-control exhaust leak.  i've always had a little bit of a leak, but now it's really bad.  i'll check the BOV, though...as that would be much easier to fix.

thanks,
Eric

Foxcolt · 11-11-2002, 02:24 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (uiuc240 @ Nov. 11 2002,2:53)</td></tr><tr><td id="QUOTE"></span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Foxcolt @ Nov. 11 2002,12:28)</td></tr><tr><td id="QUOTE">Thats what I say to eric. I think it might be the seal that connects the BOV to the flange pipe. If that's the case a new gasket should be easy to come buy. Also try tightning the BOV. Maybe it's opening a little under boost.

Jed</td></tr></table><span id='postcolor'>
you think so??? hmmm...i guess it could be that. but it really does sound like an out-of-control exhaust leak. i've always had a little bit of a leak, but now it's really bad. i'll check the BOV, though...as that would be much easier to fix.

thanks,
Eric</td></tr></table><span id='postcolor'>
If it was the exhaust I would suspect you would hear it not only under boost but all the time. That's why I think it's the BOV.

An exhaust leak would sound more like a dying pig than a screaming chicken. Much deeper sound <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/laugh.gif" border="0" valign="absmiddle" alt=':laugh:'>

uiuc240 · 11-11-2002, 06:45 PM

well, i'll definitely check it out.  but i still think it's exhaust related...since the *small* exhaust leak sound i used to have got much louder too.  i think the whistle just happens because there is more backpressure when the turbo spools...and the turbo swirls the air all over the place.

but yeah, i'll check the BOV ASAP since it's easier.  if it needs a new gasket, can I just make one out of something?  or what do i do?

Eric

nrcooled · 11-12-2002, 11:37 AM

I had the same sound under boost when I had an exhaust leak between the elbow and the dp.  It was annoying as hell

CoasTek240 · 11-12-2002, 12:01 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (uiuc240 @ Nov. 10 2002,12:02)</td></tr><tr><td id="QUOTE">it doesn't matter what the throttle is, really. if there's boost, there's crazy chicken sounds.i'm almost positive it's a gasket. i can hear and smell the evidence. damn. i didn't want to change this right now!!!

Eric</td></tr></table><span id='postcolor'>
yeah i def agree, sounds like a gasket. My friends 300z had that problem. Good luck <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'>

uiuc240 · 11-12-2002, 01:41 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (nrcooled @ Nov. 12 2002,12:37)</td></tr><tr><td id="QUOTE">I had the same sound under boost when I had an exhaust leak between the elbow and the dp. It was annoying as hell</td></tr></table><span id='postcolor'>
yeah, i'm thinking that's the one...it sounds like it's coming from there when i put my ear down there.  shite.  this is going to be such a biatch.  i'm just gonna do ALL the gaskets if i'm gonna be tearing in to it.  or can you think of a way to get that elbow in an out without taking out the turbo???  i can't seem to get at the bottom two bolts at ALL.  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/sneaky2.gif" border="0" valign="absmiddle" alt=':evil:'>  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/hmmm.gif" border="0" valign="absmiddle" alt=':hmmm:'>

Eric

11-10-2002, 01:53 PM	#1
uiuc240 Nissanaholic! Join Date: Apr 2002 Location: Naperville, IL Age: 46 Posts: 2,093 Trader Rating: (0) Feedback Score: 0 reviews	Umm, so yeah. Last night I got in my car and started driving home and there was this light tapping sound under boost. I immediately got very scared. But as I tested some things, I found that it was ONLY related to boost...not rpm. I can rev the engine in neutral and there are no sounds. So today, I went outside and did some investigating. Took the heat shield off, and the compressor outlet elbow and had me a look-see. Nothing special. All the gaskets are there and things look decent. Now the sound has changed: It's like a screaming chicken is under my hood when I boost!!!!  I don't know what that means   My main concern is that I won't damage my motor. I'm already in the process of buying an S14 BB turbo, but I'm not planning to put it in until May. So can I keep driving like this? Please, I need your thoughts.:nervous: Eric __________________ 2002 Mazda Protege5 1989 S13 w/SR20DET (sold)

11-10-2002, 03:49 PM	#2
GamblerZ Zilvia Junkie Join Date: Aug 2002 Location: West Texas Posts: 414 Trader Rating: (1) Feedback Score: 1 reviews	Boost leak? Something caught in the turbo? Wastegate problem? __________________ Visit WTI - WestTexasImports.net

11-10-2002, 07:06 PM	#3
Night Slide Josh Join Date: Nov 2002 Location: NJ Posts: 39 Trader Rating: (0) Feedback Score: 0 reviews	could also be your bov.. is it a screeching sound at partial throttle? __________________ I LOVE DRIFTING

11-10-2002, 10:02 PM	#4
uiuc240 Nissanaholic! Join Date: Apr 2002 Location: Naperville, IL Age: 46 Posts: 2,093 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Night Slide Josh @ Nov. 10 2002,8:06)</td></tr><tr><td id="QUOTE">could also be your bov.. is it a screeching sound at partial throttle?</td></tr></table><span id='postcolor'> it doesn't matter what the throttle is, really.  if there's boost, there's crazy chicken sounds.  i'm almost positive it's a gasket.  i can hear and smell the evidence.  damn.  i didn't want to change this right now!!! Eric __________________ 2002 Mazda Protege5 1989 S13 w/SR20DET (sold)

11-11-2002, 11:22 AM	#5
drifterx Premium Member Join Date: May 2001 Location: boston, ma Age: 44 Posts: 1,533 Trader Rating: (0) Feedback Score: 0 reviews	check your seals around your BOV last week i had the same problem with my eclipse but it happened that my BOV was becoming unfastened i have the blitz BOV and i didnt tighten it enough __________________ I am GOD!

11-11-2002, 11:28 AM	#6
Foxcolt Zilvia FREAK! Join Date: Apr 2002 Location: Northern VA Posts: 1,264 Trader Rating: (0) Feedback Score: 0 reviews	Thats what I say to eric. I think it might be the seal that connects the BOV to the flange pipe. If that's the case a new gasket should be easy to come buy. Also try tightning the BOV. Maybe it's opening a little under boost. Jed __________________ Driftec www.midatlantic240sx.com

11-11-2002, 01:53 PM	#7
uiuc240 Nissanaholic! Join Date: Apr 2002 Location: Naperville, IL Age: 46 Posts: 2,093 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Foxcolt @ Nov. 11 2002,12:28)</td></tr><tr><td id="QUOTE">Thats what I say to eric. I think it might be the seal that connects the BOV to the flange pipe. If that's the case a new gasket should be easy to come buy. Also try tightning the BOV. Maybe it's opening a little under boost. Jed</td></tr></table><span id='postcolor'> you think so???  hmmm...i guess it could be that.  but it really does sound like an out-of-control exhaust leak.  i've always had a little bit of a leak, but now it's really bad.  i'll check the BOV, though...as that would be much easier to fix. thanks, Eric __________________ 2002 Mazda Protege5 1989 S13 w/SR20DET (sold)

11-11-2002, 02:24 PM	#8
Foxcolt Zilvia FREAK! Join Date: Apr 2002 Location: Northern VA Posts: 1,264 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (uiuc240 @ Nov. 11 2002,2:53)</td></tr><tr><td id="QUOTE"></span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Foxcolt @ Nov. 11 2002,12:28)</td></tr><tr><td id="QUOTE">Thats what I say to eric. I think it might be the seal that connects the BOV to the flange pipe. If that's the case a new gasket should be easy to come buy. Also try tightning the BOV. Maybe it's opening a little under boost. Jed</td></tr></table><span id='postcolor'> you think so??? hmmm...i guess it could be that. but it really does sound like an out-of-control exhaust leak. i've always had a little bit of a leak, but now it's really bad. i'll check the BOV, though...as that would be much easier to fix. thanks, Eric</td></tr></table><span id='postcolor'> If it was the exhaust I would suspect you would hear it not only under boost but all the time. That's why I think it's the BOV. An exhaust leak would sound more like a dying pig than a screaming chicken. Much deeper sound <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/laugh.gif" border="0" valign="absmiddle" alt=':laugh:'> __________________ Driftec www.midatlantic240sx.com

11-11-2002, 06:45 PM	#9
uiuc240 Nissanaholic! Join Date: Apr 2002 Location: Naperville, IL Age: 46 Posts: 2,093 Trader Rating: (0) Feedback Score: 0 reviews	well, i'll definitely check it out.  but i still think it's exhaust related...since the small exhaust leak sound i used to have got much louder too.  i think the whistle just happens because there is more backpressure when the turbo spools...and the turbo swirls the air all over the place. but yeah, i'll check the BOV ASAP since it's easier.  if it needs a new gasket, can I just make one out of something?  or what do i do? Eric __________________ 2002 Mazda Protege5 1989 S13 w/SR20DET (sold)

11-12-2002, 11:37 AM	#10
nrcooled Nissanaholic! Join Date: Mar 2002 Location: Turn 8 'bout to get rolled by a SC'd ITR Age: 46 Posts: 1,849 Trader Rating: (0) Feedback Score: 0 reviews	I had the same sound under boost when I had an exhaust leak between the elbow and the dp.  It was annoying as hell __________________ '91 hatch w/ SR Sold; '03 Evo Sold 401 HP; '03 MS Protege sold; '00 Evo 6.5 TME Sold 300HP

11-12-2002, 12:01 PM	#11
CoasTek240 Post Whore! Join Date: Jan 2002 Location: VA Age: 40 Posts: 3,034 Trader Rating: (3) Feedback Score: 3 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (uiuc240 @ Nov. 10 2002,12:02)</td></tr><tr><td id="QUOTE">it doesn't matter what the throttle is, really. if there's boost, there's crazy chicken sounds.i'm almost positive it's a gasket. i can hear and smell the evidence. damn. i didn't want to change this right now!!! Eric</td></tr></table><span id='postcolor'> yeah i def agree, sounds like a gasket. My friends 300z had that problem. Good luck <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'>

11-12-2002, 01:41 PM	#12
uiuc240 Nissanaholic! Join Date: Apr 2002 Location: Naperville, IL Age: 46 Posts: 2,093 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (nrcooled @ Nov. 12 2002,12:37)</td></tr><tr><td id="QUOTE">I had the same sound under boost when I had an exhaust leak between the elbow and the dp. It was annoying as hell</td></tr></table><span id='postcolor'> yeah, i'm thinking that's the one...it sounds like it's coming from there when i put my ear down there.  shite.  this is going to be such a biatch.  i'm just gonna do ALL the gaskets if i'm gonna be tearing in to it.  or can you think of a way to get that elbow in an out without taking out the turbo???  i can't seem to get at the bottom two bolts at ALL.  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/sneaky2.gif" border="0" valign="absmiddle" alt=':evil:'>  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/hmmm.gif" border="0" valign="absmiddle" alt=':hmmm:'> Eric __________________ 2002 Mazda Protege5 1989 S13 w/SR20DET (sold)