I recently bought a 94 FD which is stock with no mods. i have been reading alot of the forms on what to check for and about adding reliabilty mods. Well the first thing it says I should get a boost gauge and see what my boost settings are, well i did getm the boost gauge hooked it up to my upper manifold nipple but when I start the car up it only read out vacuum of 14 and will never get up to any boost reading no matter how much throttle I give it. I went out on the road to do the boost test but it still does not registar any boost pattern on the gauge. Thought it might be a bad guage so obtained another and still had same results. The car idles, drives and has response, I can feel the turbo kicking in just fine. I took it on a 1500 mile trip 2 weeks ago and didn,t have a bit of trouble with it. I did notice that on of the vacuum hoses to the pressure tank poped off but I replaced it and tye wrapped it back on but still have same issues with boost not regeristting on the gauge.

I am in delima as to what is going on ! It seems to me that if the car didn't show boost on the gauge the primary turbo wouldn't be working !

 

is the gauge mechanical or electrical?
Also, you could just have a monster boost leak, its note exactly unheard of.... Check all of the coupling points, especially from the y-pipe to the crossover pipe, as that joint is particularly prone to failure. Also check that there is still an o-ring between the TB and the TB-elbow. Pics always help too.
That being said welcome to the **********ful world of FD ownership.

 

If O Ring on TB is missing wouldn't you hear air leak there ?

 

No not necessarily, boost leaks are sometimes not loud.

Also pull your stock downpipe if it's there and look to see if it's clogged.

 

Pecat is new, with about 6000 miles !
Could it be the waste gate is stuck open ?

 

it could be but more likely boost leak as others have said,go to the car, take off all the rubber hoses and pinch them to make sure they arent cracked. then u can get under the car and unhook the wastegate from the actuator if you want and see if it moves.

 

Coupling to the Y pipe was split so I replaced and now I get 12 psi boost registered on gauge at wide open throttle !