225 TT loss of boost
 

Hey everybody.

I have had an issue with this TT I bought ever since I purchased it..

Originally the car had an aftermarket manual boost controller installed in it in place of the stock N75 valve. It created a heck of a lot of boost, but caused issues with surging, so I removed it and bought a new n75 Valve.

Even with the new N75 and a new DV, the car still has this nagging problem though.....

Most noticeably going up a hill, plant your foot into it and you get 14 pounds of boost for maybe 2 seconds......Then it flattens out and sits away at 10 pounds. Sometimes though, it will only hold 10 pounds of boost for a few seconds, then go to 5 pounds and be utterly gutless....

You can correct the problem by backing off throttle, cutting boost for a brief moment, then get back on the gas again. Then it will repeat the cycle, and loose boost again.

I had it apart the other day when I was replacing the valve cover gasket, and only noticed the following "wrong"

-Line to the PCV is aged and kinked almost shut (ordered a new one)
-Hose from DV to the charge pipe has a small crack in the end (but checked and found no leak).

Plugged My MaxiDas into the car and it's not tripping any codes..

All I can think of is a MAF sensor throwing the car into limp mode, or a boost leak somewhere.


Thoughts anybody??

Thanks!

Josh

p.s, AMU motor, if that makes a difference??

Re: 225 TT loss of boost
 

Disconnect the MAF sensor and see if it makes any difference to performance. If performance improves replace the sensor. If it doesn't improve it could be a boost leak, visually check for cracks, collapsed hoses ,loose connections etc

or this link explains a little more



hope this helps

Rob

Scotland Uk