Everything that you said and the video to go along with it is 100% normal, I would not worry about it for even one second, dont listen to the ridiculous advice given by anyone in the thread because if they watched the video (which does work) then they would see that it is the turbo spooling up which is totally normal.

When I got mine tuned my turbo screamed so loud it was ear piercing.

You may be more pronounced if you have a drop in filter so pop open the intake and check it out. You have nothing to worry about, dont go to the dealer period unless you have to, or you are buying parts to DYI.

 

If you feel comfortable with it take it to a local shop and see if they can do a boost leak test but I'm telling u there is nothing wrong. Turbo's are load and even louder with stock exhaust so all u hear is the motor hum and the turbo scream

 

Ok. Thanks a lot 06MRV8Killer! I checked and it does have a drop in filter... I assumeing it is. It's green, oiled, and metal mesh... so yeah.

Thanks again!!

 

So what do you think the deal is with the badge on the back. "Dyno-Comp tuned" Do you think they tuned it with just a drop in filter?

 

He could have it tuned with just that, yes.

But if you call them up, they probably have service records that might indicate whether or not other things were installed on the car previously.

 

I called Dyno-Comp and they needed the name of the previous owner, i don't have that. So, I called up Jeff at Chapman BMW to ask him if he could tell me. He said he couldn't becuase of thier privacy policy. BUT, I is going to find out, call Dyno-Comp for me and then let me know what they say.

 

NP, Did you look over the whole car, all the bolts where bolt-ons would go to see if they have been taken on or off, this will tell you if the car had more mods on it before which would more than likely confirm that it is flashed.

As mentioned before the best thing to do to see if it is flashed is to buy a tactrix cable and down load evoscan, pull the map and compare it to stock.

 

Its probably just the turbine

 

spool play with fins maybe scraping housing?

 

Ok, so I was able to find out that it has been tuned... with Turbo back exhaust (it has stock back on now), high flow fuel pump, and drop in filter and was putting down about 291hp to the wheels.

I think I need to put the exhuast back on. becuase it is tuned for that. That's what I am telling my wife anyway... ha-ha

 

Do a boost leak test first.
But by the sound of it I would say you turbo may be going. Mine sounded similar on spool up. Made all the same power and everything, but it was done. Thrust bearing went. The whirring sound is most likely the compressor rubbing against the housing on spoolup because of too much shaft play. Pull the intake, see if the play is excessive. It's hard to say sometimes though..

But boost leak test first for sure.

 

Why dont you to actually read the posts? ^


Good idea