Bad Turbo???

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May 15, 2007 | 08:45 AM

#11

akielb

3rd Gear

Joined: Sep 2006

Posts: 2,326

From: Fargo, ND

RE: Bad Turbo???

ok - press on the gas - WOT - car should start out slow and then when it hits 2500-3k RPM you should feel more pull instantly. the first part is refered to as turbo lag - when the turbo kicks in you should be able to feel it (not a ton on stock - but some). If you really think the turbo might be blown - go test drive a few more 1.8t's and see if you can tell the difference.

May 15, 2007 | 10:06 AM

#12

onepoint8tee

Site Moderator

Joined: Sep 2005

Posts: 13,664

RE: Bad Turbo???

Quote:

ORIGINAL: cincyTT

wastegates dont rattle. im sure whatever is rattling isnt turbo/performance related. Pulling the cat wouldnt gain you anything. If the car is not unbelieveably slow, like 80hp, it is running fine.

Your letting the quietness of the airbox make you think the turbo is blown. You want to hear it spool some, take out the airbox and you will here the turbo. Its not very big so the spool will not be all that loud.

The wastegate actuator arm nut can become lose and the arm will rattle. This is actually common on higher mileage A4's. Its normaly noticeable right after you rev and let off the gas. I know someone who this has happend to.

May 15, 2007 | 10:37 AM

#13

The Bishop

Senior Member

Joined: Sep 2006

Posts: 1,209

From: North CO

RE: Bad Turbo???

Quote:

Wastegates DO rattle. I just replaced my bad k03 and the whole wastgate assembly inside the tubo was shot. It was cracked, bent, and the actuator nuts were loose. When driving, mostly at slow speeds is when i could hear it, when I let off the gas it would rattle or buzz for a coupld seconds.
You can check the actuator arm by grabbing it with a long pair of needle nose pliers and seeing if you can jiggle it.