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

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk > S Chassis

S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


Reply
 
Thread Tools Display Modes
Old 08-09-2020, 07:26 PM   #1
goodlucksilvia
 
Join Date: Jul 2019
Location: USA
Posts: 4
Trader Rating: (1)
goodlucksilvia is an unknown quantity at this point
Feedback Score: 1 reviews
SR T25 Sr20det: bad sounding noise from turbo in full boost??

I have a stock redtop 1992 sr20det. I just refreshed all of my turbo gaskets, so far everythings been driving smooth and pulls as it should.
It had the manifold to turbo gasket leaking before and sounded like a tractor, but thats all gone. No power loss now. Only other thing id note is that there was a leak because i hadnt tightened the coolant return line on the turbo enough but that was fixed.
I also repaired part of the egr that connects into the intake box but i dont think that should make a big difference because before then it ran fine.

However there's a new noise now. It wasnt happening at first at all, and it comes and goes now but happens a good 90% of the time I'm getting onto full boost while accelerating quickly. It doesnt come on until FULL boost, up until then everythings all good.

Its loud enough you can hear it over the sound of the engine& exhaust.
It sounds like a shout of a higher pitched rattling or scraping noise.
It is not a turbo death whine noise.

The only other thing i can think of is wastegate. I didnt thoroughly check it myself when i had the turbo apart, but I do at least remember the penny and arm not appearing to be loose in any way. So far, i know there was no shaft play from my memory as well, it felt and looked solid.

Tomorrow I'm going to check the shaft out for play again, and see from the outside if the wastegate arm has play....

Other than that, I wanted to ask around on here if you guys have any ideas of what it could be. I've owned this SR for a year. I've never owned a turbo car before, these are all new things to me but I know that sound isnt right.

Any pointers or speculations would be greatly appreciated. I cant seem to find anything online about this.
goodlucksilvia is offline   Reply With Quote
Sponsored Links
Old 08-10-2020, 04:50 AM   #2
S14rebuild
BANNED
 
Join Date: May 2019
Location: Florida-FAIL
Posts: 2,497
Trader Rating: (8)
S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild
Feedback Score: 8 reviews
Scraping noise? Sounds like ur veins/fins are touching in the housings.

Pull the turbo and inspect it
S14rebuild is offline   Reply With Quote
Old 08-16-2020, 01:43 AM   #3
Matesh
 
Join Date: May 2020
Location: Australia
Age: 34
Posts: 6
Trader Rating: (0)
Matesh is an unknown quantity at this point
Feedback Score: 0 reviews
could be a manifold/dump crack like at a weld

one time i dropped a bolt inside my dump pipe behind the turbo and it was bouncing around on my cat made a hell of a rattle only at certain times


Sent from my iPhone using Tapatalk
Matesh is offline   Reply With Quote
Old 08-16-2020, 04:09 AM   #4
goodlucksilvia
 
Join Date: Jul 2019
Location: USA
Posts: 4
Trader Rating: (1)
goodlucksilvia is an unknown quantity at this point
Feedback Score: 1 reviews
Update, I checked everything out to be fine.
I was able to get a friend to help me listen for the noise and we found the problem immediately.
Before, it would have been hard to figure out where the noise was coming from since nothing seemed broken on the turbo.
An odd piece of my exhaust from the down pipe was broken/loose. It's still a stock exhaust, so there's heat shielding around the area. I last recalled it to be secured.
It' just so weird because you could only hear it coincidentally at rpms that the turbo starts working.... but the case was just that certain rpm range rattling the loose piece. Shit was so loud too.

Yikes... Thanks for anyone who replied to my idiot ass, lol
goodlucksilvia is offline   Reply With Quote
Reply

Bookmarks

Tags
s13 turbo, sr20det turbo, t25 turbo, turbo noise


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 03:12 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
vB.Sponsors
Copyright © 1998 - 2019, Zilvia.net™