TT serious boost problems. Help! (Videos) - AudiWorld Forums

Go Back  AudiWorld Forums > Audi Models > Audi TT / TT-S / TT-RS > TT (Mk1) Discussion
Reload this Page > TT serious boost problems. Help! (Videos)
TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

TT serious boost problems. Help! (Videos)


Old 08-15-2014, 07:01 AM
AudiWorld Newcomer
Thread Starter
Join Date: Aug 2014
Posts: 2
Default TT serious boost problems. Help! (Videos)

Hey guys, I'm having some pretty bad boost issues and thought I'd try here first before throwing a ton of cash for diagnostic fees etc. I just replaced the turbo inlet pipe because it was collapsing under boost but I'm still having some issues. Under accelleration once boost is built it has a lot of stuttering/popping above about 15 psi and then kicks into limp mode until you let off and completely spool down. Also boost will build up to 23-25 psi very frequently, which is very scary for a motor with 190,000 miles (tuned to 18). I'm not too familiar with the turbo systems in these cars and haven't seen anything online that really matches up with my current problems. Could it be a wastegate or n75 isuue? Any help would be GREATLY appreciated. I just bought a FR-S and really need to get this car up for sale. Thanks!
Hopefully you can kind of tell what's going on in these.
Cfarris87 is offline  
Reply With Quote
Old 08-20-2014, 08:10 AM
AudiWorld Newcomer
Thread Starter
Join Date: Aug 2014
Posts: 2

Bump, anyone?
Cfarris87 is offline  
Reply With Quote
Old 09-10-2014, 03:42 AM
AudiWorld Super User
Join Date: Jul 2005
Posts: 6,605

How's your MAF? Pretty old?
roadyTT is offline  
Reply With Quote
Old 09-25-2014, 08:06 AM
AudiWorld Senior Member
Join Date: Jul 2001
Location: Cincinnati, OH
Posts: 1,739

Blowoff or recirc? I tried putting a blowoff on mine so many years ago, but car always went to safe mode because it did not see the air that was blown off. So long ago that I don't remember exactly how it acted, but I had to turn off the car and turn it back on to get it to go to regular boost again.
Power5 is offline  
Reply With Quote
Old 09-25-2014, 07:45 PM
AudiWorld Member
iflywoe's Avatar
Join Date: Jul 2009
Posts: 434

did you run the lines and see if theres a leak?
iflywoe is offline  
Reply With Quote
Old 09-29-2014, 10:23 PM
AudiWorld Newcomer
Join Date: Sep 2014
Posts: 7
Default Turbo? Leaks? Recirculation valve?

Does the turbo have lots of power still or does it feel gutless (gutless could be bad turbo)? Smoking any (bad turbo, might be able to be rebuilt with factory kit)? Does the car have no power off the line and then hammer hard all of a sudden when boost is high (pressure and vacuum leaks can cause this, use a smoker at very low pressure to find them, and bump up pressure slowly as you fix the leaks)? Does it feel good but drop power at near full boost (could be bad recirculation valve, get the 71 model for cheap or go nuts and get a custom one, but the 71's are more than fine for stage 1)? Any high pitched squealing noises under boost (bad turbo, and the spindle and fins are probably running out and hitting the exhaust housing portion of the turbo)?

Have you had anyone check the car with a vagcom type setup to see if it has triggered any codes, those are extremely helpful and key in your troubleshooting. I bought the Ross-Tech vagcom adapter for $250 so I can consistently monitor my car for problems since I am keeping the car long term.

Let us know
Shomare is offline  
Reply With Quote
Old 10-04-2014, 06:46 AM
AudiWorld Super User
Mister Bally's Avatar
Join Date: Jan 2006
Location: Detroit, Michigan USA
Posts: 5,235

If that is your original turbocharger, I would suspect it. Remove and have your original rebuilt by a reputable shop if you are keeping the car long term.

If you were to take the car to an Audi dealer, the diagnosis would be "Replace turbocharger" due to the issue you are having along with the mileage.
Mister Bally is offline  
Reply With Quote

Related Topics
Thread Starter
Last Post
A4 (B5 Platform) Discussion
10-11-2016 05:47 AM
Q5/SQ5 MKI (8R) Discussion
04-05-2016 07:38 AM
A4 (B5 Platform) Discussion
10-01-2015 02:31 AM
A6 / S6 (C5 Platform) Discussion
09-29-2015 12:22 PM
TT (Mk3) Discussion
09-27-2015 03:16 PM

Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -8. The time now is 11:14 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: