Don't know what the problem is, i was tracking the car this weekend and developed an exhaust leak on the o2 housing, a bolt made its way out. I got that fixed last night and went back to track this morning

Car was boosting fine on the way to the track, then suddenly at the track it wouldn't make more than 15 or so psi in the midrange(should be 20), the boost was acting funny too, bouncing from 10-15psi. It would make 21psi at the top of 4th sometimes, and in 5th sometimes, but mostly it would only make good boost at 3/4 throttle, on the floor it was weak. Seemed to progressively get worse where no matter where the throttle was it wouldn't make boost.

Now, no matter what, it won't make much more than 15psi. Stomp it in first, 11-15psi fluctuating, same in second. PLEASE HELP.

I have no idea what it could be, i checked the xede and made sure map was loaded, even loaded another map. Checked and made sure the boost wire didn't apart on the xede. Checked best i could for boost leaks, can't hear anything when im reving on the throttle body under the hood, and can't hear a leak while im driving.

The way it has progressively gotten worse, i think it must be a leak that has continuesly gotten worse. ANY thoughts would be greatly appreciated.

Thanks fellas

 

Once in a while some Xedes lose boost like this. There is a fix for it but you can just turn your car off and restart it and the problem should be solved. You might want to reset your ecu while you are at it. Disconnect the negative battery terminal for a few minutes. Let us know how it works.

 

yup...seems like a boost leak...I had one that was a ***** to find. Better whip out the pressure tester.

 

Smog, i have turned the car on and off 20 times today, still the same. Pulled the ECU fuse 3 times, still the same.

EJ1, where did you find your boost leak at? Could you hear it? Could you feel air coming from it?

Thanks for the help.

 

is your o2 housing stock?

 

no, I did not even know what it was at first, but it was my first guess. Could not see it, could not hear it, etc. I replaced my IC piping, and it was a hole in one of the welds on the turbo discharge pipe. A pinhole smaller than the eye can see. But with a pressure tester, the car off, and some soapy water it was apparent.

 

how badly did it leak? cost you 6-7psi?

and yes, stock o2 housing

 

well im used to seeing 23lbs in 5th gear peak, and 22lbs in 4th. I could not hit anything higher than 17-18, even turning the MBC all the way up.

 

Just drove my car for first time today, no problems what so ever.

I guess the super hot cuplings moved and allowed a leak. I guess when they completely cooled, they molded back in place. I need to do some adjusting on them i guess.

Still, thats just a guess. Don't know what the real problem is for sure yet.