Turbo Death Whine or Boost Leak? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

wakeboarder843 · 05-27-2013, 01:30 PM

Trying to figure out what this noise is what does it sound like to you?

Kingtal0n · 05-27-2013, 02:09 PM

hehe that sounds like a boost leak. pressurize the plumbing and I bet you find it, a coupler or around the bypass valve.

speaking of which, I also heard the compressor surge. Check your dedicated vacuum line to the bypass valve. you *do* have a dedicated bypass vacuum line, right?

wakeboarder843 · 05-27-2013, 05:48 PM

Yes I have a vacuum line from the bov to the top right nipple of the intake. the top left goes to the fpr and the bottom nipple running to the wastegate since I dont have a nipple on my hotpipe. and I have no boost controller if that makes any difference.

I will do a pressure test once I build a boost leak tester to see if I have any leaks..

By compressor surge you mean the flutter noise my bov is making? can I fix this by adjusting the bov screw? my bov is located on my hotpipe and is recirculated but with a shitty plastic flex tubing which I will replace shortly. I have the greddy RZ bov

Kingtal0n · 05-27-2013, 05:51 PM

Quote:

Originally Posted by wakeboarder843

Yes I have a vacuum line from the bov to the top right nipple of the intake. the top left goes to the fpr and the bottom nipple running to the wastegate since I dont have a nipple on my hotpipe. and I have no boost controller if that makes any difference.

I will do a pressure test once I build a boost leak tester to see if I have any leaks..

By compressor surge you mean the flutter noise my bov is making? can I fix this by adjusting the bov screw? my bov is located on my hotpipe and is recirculated but with a shitty plastic flex tubing which I will replace shortly. I have the greddy RZ bov

1. make sure you are using a dedicated vacuum source. there is one port on the throttle body that does not provide vacuum when the throttle valve is shut.

2. The flutter is coming from the compressor wheel, not your bypass valve. You need to adjust the bypass valve, or fix the vacuum source, or replace the bypass valve.

w0nderbr3ad · 05-28-2013, 12:45 AM

I have this same issue since I installed my arc smic. I've read that sometimes its a bad bov gasket or a screw. I bought a new gasket, but won't see if this solves the problem for another week until it gets here.

Sounds a lot similar to this.

05-27-2013, 01:30 PM	#1
wakeboarder843 Join Date: Feb 2011 Location: Miami, Fl Age: 35 Posts: 26 Trader Rating: (0) Feedback Score: 0 reviews	Turbo Death Whine or Boost Leak? Trying to figure out what this noise is what does it sound like to you?

05-27-2013, 02:09 PM	#2
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,828 Trader Rating: (17) Feedback Score: 17 reviews	hehe that sounds like a boost leak. pressurize the plumbing and I bet you find it, a coupler or around the bypass valve. speaking of which, I also heard the compressor surge. Check your dedicated vacuum line to the bypass valve. you do have a dedicated bypass vacuum line, right? __________________ 5.3/4l80e/turbo 240sx playthrough: tinyurl.com/4l80er

05-27-2013, 05:48 PM	#3
wakeboarder843 Join Date: Feb 2011 Location: Miami, Fl Age: 35 Posts: 26 Trader Rating: (0) Feedback Score: 0 reviews	Yes I have a vacuum line from the bov to the top right nipple of the intake. the top left goes to the fpr and the bottom nipple running to the wastegate since I dont have a nipple on my hotpipe. and I have no boost controller if that makes any difference. I will do a pressure test once I build a boost leak tester to see if I have any leaks.. By compressor surge you mean the flutter noise my bov is making? can I fix this by adjusting the bov screw? my bov is located on my hotpipe and is recirculated but with a shitty plastic flex tubing which I will replace shortly. I have the greddy RZ bov

05-28-2013, 12:45 AM	#5
w0nderbr3ad Zilvia FREAK! Join Date: Feb 2004 Location: Vantucky Posts: 1,294 Trader Rating: (50) Feedback Score: 50 reviews	I have this same issue since I installed my arc smic. I've read that sometimes its a bad bov gasket or a screw. I bought a new gasket, but won't see if this solves the problem for another week until it gets here. Sounds a lot similar to this.