Help with diagnosis

[barraturtle]

Hey all, Having a boost issue with my BA (Cooler, 4 inch dump & exhaust, injectors, X4 with custom tune 297kw@14psi, currently running custom 10psi safe tune), 1st will boost to about 5psi the 0psi, 2nd will spool up then 0psi, currently nursing.

No fault codes appearing,  so far have checked/replaced,

 

-piping, joiners & BOV vacuum lines (replaced the sh*t turbo intake & throttle body joiners & vac lines with silicones and T-bolts)

-intake/exhaust & turbo manifold bolts (exhaust manifold bolts were loosish to my suprise)

-wastegate solenoid to actuator & turbo lines. (solenoid maintenance at the same time)

-wastegate for movement (not sticking)

 

I am leaning towards a failing actuator diaphragm or spring because when I checked that the wastegate was moving it seemed that the spring tension was quite soft (checked the tension on a spare diesel turbo) in comparison.

any input is greatly appreciated.

[Typhoon]

Sounds like you have checked the basics up to now.

 

Have you considered removing the boost pressure sensor and cleaning it or at least having a look at it?

 

The part looks like this

 

http://www.ebay.com.au/itm/GENUINE-FORD-BA-BF-FG-MK2-FALCON-SX-SY-TERRITORY-TURBO-BOOST-PRESSURE-SENSOR/291215473643

 

On a standard BA xr6 turbo it will be located on the intake pipe near the battery. If this is faulty it could cause the problems your describing.

 

Should have a trouble code associated with this type of sensor failure, however with a tuned car who knows.

 

Sounds like a waste gate problem

 

Good luck mate

[barraturtle]

ok for some weird reason my car has fixed itself (not complaining),

 

I will still pull of the BPS for inspection and a clean this weekend,

 

Has this ever happened to anyone before?

[skidxr6t]

yes they love to run inconsistent.

 

things like bad electrical connections (earthing etc), fuel etc make a big difference.

[Chrisooo97]

Any of you guys know where the bps is located on a fg turbo ?

[Puffwagon]