If the whistle noise you hear sounds like my car then its a boost leak.

 

That your Abarth?

 

Yep. Made 194whp 208wtq with just an intake and a boost leak. All of them have boost leaks.

 

Hard to tell on my phone. Mostly hearing exhaust. So what if it is a boost leak and i fail to correct it?

 

It's not a boost leak. All Cobalts do it. Unless there is a factory boost leak... Different car. Could make the same sound for a different reason.

 

Dont really understand it either, Like I said, after replacing the intake mani, and injector seals. Mine stopped. So, it could of been a number of things, I have my theories of course. I will let every one know if i can get it to go away after doing dome fueling mods soon. Ive yet to take anything off my stock LDK

 

This is actually a very good representation of the noise. unfortunately , if its not found in your boost tubing , Its going to be very hard to track down. My tubes are perfectly fine after pressure testing them so it must reside somewhere in the manifold.

 

As long as your car is correcting for fueling and keeping your fuel trims close to 0.0 +/- 5.0, and your peak boost is where it should be, then your fine. worse that could happen is the turbo is working just alittle bit harder than it needs to. no big deal. Ive see dummies with large openings flooring it trying to figure out why they dont generate boost, meanwhile there turbo is losing its **** lol. normally the check engine light will take care of that but it its been deleted/disabled....

 

To help explain, i took this video.

 

The noise is at around :25

 

Anybody watch this video? Thoughts?

 

Mine does this exact noise. of note, I didn't hear it until after I installed my k&N SRI recently. all connections have been double checked. I was thinking it was normal just now audible with the SRI?

 

Yes normal k&n sri sound.

 

I have had the knn for years and didnt hear this sound until my turbo was replaced last month. Blows my mind

 

That is weird. Maybe you weren't making optimal power with the old turbo? The whistle only comes higher up in the RPM. It grew louder going from GMS1 to Trifecta.

 

Hmmm then again I have only been tuned for about 2 months now.

 

just fyi I have been tuned with Trifecta 22psi for about a yr. now. only other mods are DP and exhaust, so stock pipes as well.

 

So im seeing it as common, but being common doesnt answer if its normal. Scared to go WOT lol

 

You think it could be a cracked turbo or something? Or bad install and it's leaking unfiltered air?

To me, mine sounds like a normal turbo. I am confident and will keep rocking that sweet sound.

Check out this vid. It's neat all the cool sounds the car makes up front.

 

All the sounds in that video sound normal to me. Awesome vid BTW. Must have been a lot of humbled drivers there that day after they had to let a Cobalt past. Some of those guys have horrible driving lines though -- I've never driven Laguna Seca in real life, but I have a really good idea of the best line from all the times I've driven it in video games.

 

Dude that turbo was working! Bet it was nice and cherry red at the end

 

Naw wouldn't be that red haha. And he is only GMS1 in vid.

 

I was running GMS1 and had the exact same noise. Making 20psi was almost impossible. I tightened the coupling going to the TB and re-oriented the GMS1 boost sensor on the lower charge pipe so it would not contact anything. Sound went away after that and I could feel that the car had more power and was more responsive. You can hear the "before" in the vid. I have a K&N SRI btw, that's where you hear the blow off from.

 

mygod that looks fun. we only have 1/4 mile and a flat track here

and auto x of course.

 

Yes I have never been to a track either but would love to next year since i'm off warranty now.