Can't Get Any More Boost

[The_Bogan]

wont be an injector fault.

more than likely an exhaust issue. I would say the stock exhaust is holding you back, check and retension your manifold and turbo bolts.

though I would be checking all of your intercooler piping to make sure that nothing has worn a hole through, causing a massive boost leak.

could also be the valve springs.

[BB.]

yeah, I think I have ruled exhaust out, but your right possibly dump pipe, but the turbo has been taken off and put back on so bolts shouldn't be loose.

I bloody hope its not valve springs, they are brand new crow springs.

[The_Bogan]

check your cooler piping mate!

[BB.]

yeah, that's on the list of things to go over tomorrow... But I doubt its the cause... I should be able to hear it if it was a boost leak.

[bluprinturbo]

sh*thouse actuator?

[The_Bogan]

good call!!!

could also be a crap actuator or not what you paid for.

try dropping your exhaust at the dump pipe before the cat and give it a run and see if you make anymore boost, could quite possibly be a collapsed cat.

[01txr]

senna T, Doesn't matter if the stock BOV is wrong way or not, mine is fitted the opposite way.

All that seems to happen is it is louder.

Still runs up to 15psi tapers back to 12psi.

One thing I had noticed is back when my x- force was fitted near 2 years ago

It would over boost to 21 psi first time WOT after 5mins driving then everytime after that

it would go 15 tapered to 12. this was 6am mornings during winter with stock cooler.

It stopped doing that now but dont know why. I never changed anything.

Even with the new tune it hasn't ever boosted higher than 15psi.

Never had IC out so maybe it is blocked up with dirt or the Boost solinoid maybe causing it.

Dont know if its just me getting use to its power and thinking it is slower now or it just is.

Use lift in 2nd & 3rd to the point the tyres felt like they where right on the edge of traction

2nd and 3rd gear right to 5500rpm.

Since then I have changed to the t56, CI Twin Plate and better rubber.

just mentioning all this as maybe something is deteriorating with time and I may also

be limited at a certain boost level like you are.

Engine seems good with oil control and vacume still pulling 25hg.

May have to plumb up a Fuel pressure gauge to see what pressure the injectors are getting under load.

Maybe fuel pumping issue.

There is so many varibles with these cars its amazing.

Not like the old Carb'd V8's and 6's where you just get the timing correct and the carb and jets

correct and away they go.

[ENVY-T]

The cats already been eaten by a dog!

[01txr]

Bloody mungr*l was thinking the cat was gone.

Actually thinking about it if the cat starts clogging up with carbon then boost is going to be restricted.

Whats the actual life of say a X-Force Cat, anyone have one completely fail yet.

Jusy wondering have you cleaned the o2 sensor or maybe it needs replacing.

Maybe causing wrong readings with the PCM and limiting boost.

Or check all sensor plug fittings for connection and that none have got corrossion in them or

any fluid on them as well as earthing.

Maybe something not reading correctly causing your boost problem.

Try finding out all sensor specs and checking them.

[BB.]

Everything does seem to lead to sh*t actuator, the model on the actuator states its a 13 psi, but I guess they couldn have put the sticker on the wrong one, also it may have just been a dodgy one from day dot...

And as Max said, the dog has already ate my cat.

Edited 14/03/09 02:57 PM by BB.