Obscene_CNN

I swapped compressor wheels out using a pre-balanced compressor wheel. I'm trying to figure out if the increased turbo whine is due to the fact I'm running a bigger trim or if its out of balance.

Tom-Guy

Whine is caused by airflow dynamics, both on the compressor and turbine sides of things, but predominantly the intake tract.

Imbalance leads to worn bearings--> scraping against housings, leaky oil smoking turbos, and exploded wheels. Not whining.

Dweezil

I'm going to guess a wheels scrapeing from an balance stack. Basicly from the wheels being balanced seperatly, but not indexed together so the assembly is out of balance.

BigWheeze

Tom-Guy

I'm with Wheezer.

Obscene_CNN

The wheel isn't scraping. However I do know that an imbalanced compressor and turbine assembly does create more whine because it wobbles. This wobbling creates instability in the air flow which results in more whine.

Tom-Guy

You don't know ----, ***** monkey.

Obscene_CNN

" With the increasing popularity of small turbos in automotive applications, stackup unbalance has become more of a factor. Due to the light mass and high rotational speeds of these small units, simply balancing the components to an overly close tolerance may not be enough. The typical symptoms of a slightly unbalanced small turbo are oil leakage from the ends of the bearing housing, and “screaming,” an unbalance induced vibration of the rotating assembly. The fastest, most effective method of eliminating the stackup unbalance that causes these problems is to trim balance the moving parts of the assembled turbo CHRA (center housing rotating assembly)."

http://www.---------------.com/old/letter.htm

Apparently I know more than you ... *** clown :1

Go read some articles on surge and what can induce it.

biscuit

So your asking questions on here why....

Obscene_CNN

To get advice from people smarter than him