New IC = turbo flutter

[chadly]

Well I installed a new stretched ic about a month ago and I finally got around to testing it out. All is well at WOT but at partial boost it now flutters and makes all kinds of noise. Any suggestions as to why this would happen.

Thanks
Chad

 

[SNOWBIRD]

Less restiction ,flowing more air ....a ported shroad will fix your problem some will use a bov and a fast fix is a tornado ....

 

[SS_Sean]

That's the sound of horsepower.... How sweet it is.

 

[chadly]

I remember the commercials for the tornado many years ago and I believe there are some opinions of there use on the boards. I will do a search.
I’m still learning so excuse my ignorance but what do you mean by a ported shroud?

 

[couldahadav8]

did you ever fix this condition?

 

[chadly]

No I have not fixed it. It still flutters about half throttle. The boost gage moves aup and down about 2psi and makes a little noise. It's really not that bad just annoying.

 

[TurboDave]

No I have not fixed it. It still flutters about half throttle. The boost gage moves aup and down about 2psi and makes a little noise. It's really not that bad just annoying.

What you are experiencing is compressor stall. Sometimes occurs when the volume/shape of the overall intake tract is changed, such as when you changed to a different intercooler.
I've heard that the tornado can help cancel the effects but it's not something I'd feel comfortable mounting in front of my turbo.
Another route would be to experiment with changing some other geometry of your inlet plumbing. Like maybe a different size up pipe for example.

 

[Mad_Trbo]

Compressor stall

I am curious on how the Tornado tool works?

I am thinking the BOV should resolve your issue.

It does sound like the turbo is stalling, in other words when you are going to part throttle and the turbo is spooled up the blade is shutting and causing a back log of pressure. Which is feeding back against the compressor wheel. Unfortunately the exhaust energy is enough to over come this and the wheel is actually stalling. This is a negative because you have opposing energy between the compressor wheel and the exhaust turbine wheel. This can cause the the shaft to twist and can fail eventually. This will also lead to shaft play which.

I think a BOV equiped with the right spring to relieve that pressure to the atmosphere could be the right answer. The only challenge is if you are using MAF and dealing with the metered air being passed to atmosphere could cause a rich condition.

It wouldn't hurt to at least look into this through conversations with others who understand the effects of compressor stall and what causes it.

Good luck!

 

[stickybones]

As crazy as it sounds, I installed a "Tornado" in the air inlet pipe right in front of the turbo inlet bell and it absolutely got rid of the turbo surge I experienced after I went with a front mount intercooler. Cheap, simple and effective solution.

I don't know what the fear is that some have of this part. It can't fit into the turbo inlet and the likelihood of it "falling apart" and getting sucked into the turbo in pieces is....well....not very likely. There's many more other things that are likely to ruin my day then the tornado falling apart.

 

[t3intercooled]

Other option you have is put a blow off valve in line of the up pipe. Instead of using it as a wastegate, all it does is blow off the excess air, there is nothing that causes your boost to go down or up it simply releases the extra air when you shut the throttle to avoid the surge. Here is a pic that shows where mine is it was a cheap 30 dollar one off of ebay. Dont need anything special like Tial, etc. Any blow off valve will do.

You can see it just in front of my alky nozzle. Very simple modifaction, just cut a hole in ur up pipe and weld it on.

 

[stickybones]

Other option you have is put a blow off valve in line of the up pipe. Instead of using it as a wastegate, all it does is blow off the excess air, there is nothing that causes your boost to go down or up it simply releases the extra air when you shut the throttle to avoid the surge.

This is a totally different application for a totally different problem.

 

[bmackinnon]

Other option you have is put a blow off valve in line of the up pipe. Instead of using it as a wastegate, all it does is blow off the excess air, there is nothing that causes your boost to go down or up it simply releases the extra air when you shut the throttle to avoid the surge. Here is a pic that shows where mine is it was a cheap 30 dollar one off of ebay. Dont need anything special like Tial, etc. Any blow off valve will do.

Sheeesh.... WRONG!!!! What sticky and dave said..... ugh.....:frown:

 

[sabersaw30]

As crazy as it sounds, I installed a "Tornado" in the air inlet pipe right in front of the turbo inlet bell and it absolutely got rid of the turbo surge I experienced after I went with a front mount intercooler. Cheap, simple and effective solution.

I don't know what the fear is that some have of this part. It can't fit into the turbo inlet and the likelihood of it "falling apart" and getting sucked into the turbo in pieces is....well....not very likely. There's many more other things that are likely to ruin my day then the tornado falling apart.

what is the part no.?I got a huge front mount and I will try it.

 

[stickybones]

what is the part no.?I got a huge front mount and I will try it.

KI-75

The 75 is the diameter in mm. You need to get the right size for your MAF pipe (mine is 3" of course).

They're all over ebay if you want one.

 

[t3intercooled]

actually no, i had compressor surge flutter, installed that hmmmm went away, just giving my .02

 

[stickybones]

Then why did you say "it simply releases the extra air when you shut the throttle to avoid the surge"? The compressor stall from the throttle slamming shut is not surge, but it is remedied by a BOV.

That's not the problem chadly said he was experiencing.

 

[couldahadav8]

Yes it seem like 2 different issues, one is when you are on the gas hard and into the boost and maintain it you can get the noise/stall, and the second is when you let off the gas and get the fluttering noise.