TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

Overboosting Issue - Any Ideas? What should I check/replace?

Thread Tools
 
Search this Thread
 
Old Jun 16, 2006 | 05:19 AM
  #1  
Kyle K: TampaS4's Avatar
Thread Starter
AudiWorld Super User
 
Joined: Aug 2000
Posts: 2,720
Likes: 0
Default Overboosting Issue - Any Ideas? What should I check/replace?

Our 225 TT is GIAC Chipped with everything else stock. We replaced the MAF and did a pressure test. The car will boost up to 25psi and possibly over(the gauge doesn't go higher than 25).

EDIT - it never over-boosted like this after the chip install only until about 6 months later it started acting up.

Only things i can think of are N75 valve or the Diverter Valve. Anything else that could be a possibility?

We want to get a boost machine to control some of this, but I don't think we should until this problem is addressed.

<img src="http://pictureposter.audiworld.com/9102/all3.jpg">
Reply
Old Jun 16, 2006 | 05:20 AM
  #2  
TTagz's Avatar
Senior Member
 
Joined: May 2004
Posts: 5,329
Likes: 0
Default

doesn't sound like a problem to me!
Reply
Old Jun 16, 2006 | 05:49 AM
  #3  
TTinCT's Avatar
Rest In Peace
 
Joined: Jun 2000
Posts: 24,689
Likes: 0
Default double check the hose from the N75 valve to the wastegate>>>

if it is cracked and you have a leak, then you can overboost...
Reply
Old Jun 16, 2006 | 06:31 AM
  #4  
nikhil's Avatar
AudiWorld Super User
 
Joined: Apr 2001
Posts: 8,025
Likes: 0
Default is it throwing codes?

if you decide to replace the hose from the N75 to the wastegate, see my writeup from yesterday...
Reply
Old Jun 16, 2006 | 07:33 AM
  #5  
Kyle K: TampaS4's Avatar
Thread Starter
AudiWorld Super User
 
Joined: Aug 2000
Posts: 2,720
Likes: 0
Default No, its not. But that may be because the GIAC chip is more lenient on boost fluctuations..

thanks for the help.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
AudiTT225CT
TT (Mk1) Discussion
1
Jul 1, 2009 11:51 AM
hahnmgh63
TT (Mk1) Discussion
4
Mar 20, 2009 10:51 AM
AWD2KS4
S4 / RS4 (B5 Platform) Discussion
12
Jan 7, 2008 10:18 AM
NevaFolow
A4 (B5 Platform) Discussion
17
Jun 14, 2007 03:03 PM
twoquattros
A4 (B5 Platform) Discussion
15
Aug 7, 2005 07:39 PM




All times are GMT -8. The time now is 03:07 AM.

story-0
New Audi A6 Allroad Is The Market's Coolest Wagon: 9 Things to Know

Slideshow: Audi's latest A6 Allroad gets RS-style fenders, real off-road hardware, and enough personality to stand out in a market obsessed with crossovers.

By Pouria Savadkouei | 2026-06-16 17:31:52


VIEW MORE
story-1
10 Strangest Audi Designs That Actually Made Production

Slideshow: 10 strangest Audi designs that actually made production

By Joe Kucinski | 2026-06-10 16:32:29


VIEW MORE
story-2
2027 Audi Q7 and SQ7: Audi Upgraded EVERYTHING!

Slideshow: Everything you need to know about the 2027 Audi Q7 and SQ7

By Michael S. Palmer | 2026-06-09 06:02:56


VIEW MORE
story-3
Audi Unveils Absurdly Cool New Supercar: 10 Things You Need to Know!

Slideshow: Limited to just 499 units, the 987-horsepower halo car signals a new chapter for Audi performance.

By Verdad Gallardo | 2026-06-04 17:37:15


VIEW MORE
story-4
The Highs & Lows of Every Audi C-Class Generation

Slideshow: The highs and lows of every Audi C-Class generation.

By Joe Kucinski | 2026-05-27 16:05:50


VIEW MORE
story-5
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer

People were more than happy to shell out big bucks for these cars.

By Brett Foote | 2026-05-27 15:32:23


VIEW MORE
story-6
10 Audi Features & Options We Miss the Most!

Slideshow: 10 Audi features and options we miss the most.

By Joe Kucinski | 2026-05-12 19:33:47


VIEW MORE
story-7
Audi Recreates Crazy-Looking Speed Record Breaker From 1935

Slideshow: Audi has recreated one of the wildest machines of the pre-war speed-record era, reviving a streamlined V16 racer that originally exceeded 200 mph in 1935.

By Verdad Gallardo | 2026-05-11 09:49:34


VIEW MORE
story-8
Coachbuilder Recreates the 1995 Audi TTS Concept

Slideshow: A Dutch coachbuilder has reimagined the original Audi TT by finishing what the 1995 concept only hinted at.

By Verdad Gallardo | 2026-05-05 15:17:58


VIEW MORE
story-9
Every Audi V10 Car Ranked!

Slideshow: Ranking every Audi V10 road car

By Joe Kucinski | 2026-04-29 16:11:56


VIEW MORE