TWO wierd sounds from turbo....
 

I have some sounds that are coming from my turbo that I cant diagnose the source of. Maybe some of you guys have heard them before and fixed the problem.

Sound 1- Began after the instal of a JR high flow cat. Sounds like when you blow through a cardboard paper towel roll. Begins shortly after reaching boost and is louder then the spool of the turbine.

Sound 2- Begins when the turbo starts to spool but goes away when boosts hits at higher rpms. Arrived after the tightening of the wastegate actuator rod. sounds like a rattlesnakes tail. I have a feeling this one is the rod bouncing back between the side of the wastegate and the pin.

Any idea's? I would like to figure it out before NE dyno day on sat although I dont feel any deliverance in performance, its anoying and sounds broken.
Thanks,
7

My guesses

#1 I don't understand what you mean, I can't recall ever blowing into a cardboard tube

#2 downpipe rattling against tranny or WG actuator rod end rattling between WG lever and cotter pin. I had both problems. The first I fixed when I put the tranny back in after the clutch. The second I removed the cotter pin and replaced it with a bent finishing nail.

#2 Can also be fixed by just adding washers behind the arm so that it's right up against the pin.

i am having the same sounds coming from my engine bay.

#1 there is no sound when I blow through a tube.

unless you mean yell or raspberry.

Hmm, maybe it will help if I can get some sound clips. I'm going to give the washer thing a shot later and see if that takes care of #2

listen to mine, it doesnt sound like that does it? if so that's normal boost in the making....

http://youtube.com/watch?v=IxSSi80Lv8s

Heres the video, please help!

http://www.youtube.com/watch?v=UP9mb9kqUWE

so wierd....did it happen before we put the BEGi in? Is it just something rattling?

I heard what sounded like an exhaust rattle at one point. But that's all I heard.

I heard it person last week...listen for the sound that sounds like water pressurizing through an empty lawn hose....best why i can describe it. best heard at 21-25secs.

It was doing it at the time. Remember what we thought was the wastegate rattling or something because of the bigger cat? I tightened it all the way and its still there. I might switch the cat out tomorrow with the stocker and see if the JR cat is bad. Maybe its has a leak but i dont see why it would make that noise. Other then that I'm stumped.

I'm not hearing anything odd. Like ben at one point it sounds like a hi frequency rattle.

So i might have found the problem. The shaft in the turbo has a ever so slight of play in it. Is that normal or is it not supost to move. Can i fix it or does it need to be rebuilt? basically whats my next step?

Would the turbo make sounds like this if it was oil deprived? I dont have the oil return drilled so there might be a kink in it?

most turbos ARE supposed to have a tiny bit of play until the oil gets in the bearings, then its supposed to seal up from what I understand...

But I don't understand that much so IDK.

when you're turbo has enough play that the compressor blades hit the walls, it sounds like this: https://www.miataturbo.net/braineack...s/badspool.wmv

I really don't think it's the turbo per-say...

every needs to listen between 11 - 17secs., dont listen to the exhaust or the turbo spool...you'll hear a crazy rattling....then you can here it on the rest of the clips.

Tranny gears :dunno: i dont think it is compressor blades on the wall. I had my nissan tranny fuck up on me and it sounded kinda like that put in new synchros and it wass all better.

The shaft should have some play up, down, side-to-side (axial/radial) but not back and forth (lateral). The axial movement accounts for the space the oil film will take up, lateral movement just means shit (the thrust bearing) is worn out and the compressor wheel will eventually hit the inside of the housing, if it hasn't already.

Ok, I think I heard it. Sounds like a buzzing sound that is surging a bit. What's being used as a boost controller?

http://www.voodooboost.com/

Checked the oil return and feed and no kinks. Oil level is fine and i guess the play in the shaft is normal. Do you guys really think the noise could be from an exhaust leak?