Boosting Issues

[Camotec]

Ok here we go again.... short story, drove to sydney exhaust fell off bought new stainless zorst (cookies) driving back from sydney and was taking alot longer to boost and somtimes not getting to full boost at all i am putting this down to loose turbo manifold bolts, am just waiting for the car to cool down before i tighten them (if they tighten) just wondering what else the issue could be caused by??

my intercooler/piping is holding boost fine :)

Cheers

[Cookiemonster]

Ben, if the bolts that are holding the turbo onto the manifold were loose then by replacing the exhaust we may have nudged the turbo just enough to make any leaks worse than they were. And it was definitely leaking.. I could see the exhuast fumes come out between the turbo and manifold whilst it was idleing.

Tighten those nuts up (14mm) and let me know how it goes.

[Camotec]

ok i tightened the block/manifold bolts but the turbo/manifold bolts are tight, but boosting is still bad, either not boosting at partial throttle or at full throttle it isn't starting to boost until say 3000 and reaches full boost (1bar) very late in the rev range 5500 or not at all ??? what is going on? i have only put on a 3" stainless exhaust? and i can hear an exhaust leak? i have found a tiny crack in the exhaust manifold but i have been told by a few people with cracks in there own manifolds that it shouldn't affect boost like this? the crack looks old anyways??

Please help.

[Cookiemonster]

Crack in the exhaust manifold will definitely affect your boost. It may have progressively got worse.

Leak between turbo and throttle body will also reduce boost. Leaking vacuum hose will affect boost.

Also check the wastegate is closing fully.

[ja_starion]

your exhaust is to big 3" is to big 2 and a half is big enofe

[Camotec]

I am going to go hang of those bolts and see if i can get them to move
will let you know how i go

[Cookiemonster]

Don't shear them off. ;)

[Camotec]

it's ok i have some spare allen key bolts rofl

WANTSOM: save me that exhaust manifold :)

F%$king starions!! jesus hehe

[StarionChef]

are u sure its leaking that bad? there would be alot of whilling goin on, can you hear it?

doesnt sound like exhaust, vacume, boost sensing more than likely

[Camotec]

ok it's the wastegate cap, turns out that wastegate pipe was what gave me the quick boost, now with cap on the wastegate the boost takes forever to get to my desired level (1bar).

now i have to spend more friggin money to get the pipe sorted out.
Got the shits at the moment :glare:

[StarionChef]

yeah, get a pipe done same as you had. Try to get them to run the pipe into the main pipe after the second bend :)

[Camotec]

Will do, I am going to go to the exhaust shop tomorrow to get it all sorted out. i will get them to take the dump pipe and the wastegate cap off and get them to work there magic.

I might have to put a few things on hold depending on how much this costs me.

[Cookiemonster]

ok it's the wastegate cap, turns out that wastegate pipe was what gave me the quick boost,

How do you know? I don't understand that. I never had any of these problem with that exhaust. Full boost at 4000rpm with a TC06.

[Cookiemonster]

Camotec has discovered the problem. It had nothing to do with the larger exhaust. I let him tell you if he is brave enough. :)

[NXTIME]

This should be good...out with it :D