Hello,

In first time, i'm sorry because i'm french and as you know frenchies don't speak english very well so if you don't understand it's normal.

I have a 996 TT and before the boost presure was always at 1.1b.
Sinc few month, i only have 0.9b.
I have changed the DV and the N75 solenoid and all the boost hoses are OK.

In france, all the professionals don't find something but i'm not sure thuy know what tey have to search.

I have made a tool to test the boost leaks. It's a plate i place in place of the airbox. But when i try to test , i have lot of presure which go out by the oil filling stopper. I don't know where the air can pass in the oil system.

I have also durametric and i can see the value of the maf is at the maximun at 5400tr/min and after he don't evolve.

I can say if you have understand all i wrote but if someone can help, it will be very nice.

In France, lot of people read this forum because we can find lot of nice things

best regards

 

Ist going thru the motor... block off the black hose going to the oil cooler... in back of motor... not easy to get to...

 

In back of motor?. Can you say me more because i don't see this hose.
I have the pet to help me but i don't see the beginning of this hose

 

Is it th e hose which is connect in the circle on this pic?

 

no its on part #11

see the little hose just on top of the aluminum intake... next the the grey hose...

 

Ok I see. Now I see why some people make a toll directly before the turbo!!!

 

Another question. to increase presure, we have to change the value in electronic or only modify the WG. I ask that because if there's a boost presure leak, that could be the fault of a spring defect of the WG??

 

We do. That's how I do it. But that's not what Said.

 

I have asked this question because I thought that the WG fixe the pressure and the DV stop the excess of pressure in the holes when you stop to accelerate. But it's not exact.

If we have a problem with the DV, the pressure regulation could be bad, that function like that???

 

From the TB...




and from the turbos... block the other one off..

 

I think soon Marek will start finding boost leaks with his mind...
You da man!

 

Hello,

I have made a tool to find my boost leak from the TB and I think I have found it

The air goes out by the little hose which is connected here



I think it's this one and the two valves must be bad



Am I right??? And what is the role of tis hose???

 

Thanks for sharing such great info!

And Mark you are the man who benefits entire 6speed community!

 

Yes thats the common check valve that goes bad.. good find... #16
markski

 

+rep for Markski...one of the few tuners who always helps out fellow members.

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