New Turbo Installed But Wont Boost

[RamR33]

hi,

ive just replaced my old turbo with my new one and for some reason it wont boost at all as ive only changed the turbo and everything was put back to the way it was as in intake pipe and plumped bov and as soon as i try to hit boost it wont go past 0.

im thinking it might be actuator stuck or something but not sure.

I have taken the intake pipe to see if turbo is seized but spins nice and freely also checked all exhaust bolts all fine.

any ideas on wat it could be? or to no if its the actuator is working or not?

any help would be great.

[Moodles2]

Is the dump pipe a split or bellmouth type? If it's a split type, the flap that controls the wastegate gas might be stuck wide open fouled on the split itself

[RamR33]

its a split dump pipe,but its a straight bolt on turbo to suit RB25det.

what can be done for this to be sorted out?

do i need a new dump pipe or can i buy one like from just jap or something like that?

[RamR33]

Just had a look and at the dump pipe and not sure wat it is. all i no and can see is the back dump pipe bolts on to the turbo and there a lil groove were the dump pipe bolt goes but cant see it being split.

so dont think its a split dump pipe.

looks like the ones they sell on justjap but not stainless steel

[Kris..]

start the car and let it idle, pull actuator line off but so its still connected on actuator end, put and air blower in the hose and force some pressure into it, if it opens ull hear it, if it doesnt then it probably stuck on something

[boostn0199]

Try driving with dump off to see if it boosts then youll know if the flaps getting jammed or not

[RamR33]

Kris do you mean just blow air into the acuator vacume hose line which goes to the turbo with car idling?

[RamR33]

i blew air into the actuator line and it moved back and forth so that seem to be working.

Dont really no what else it could be as all ive done is replaced the turbo with a bigger one, i even checked the oil liine if it was getting oil and thats all fine and good.

even reving it on idle it makes a lil sound from the pod but nothing like the stock turbo as u can feel just from idle and reving it,it doesnt seem or feel right,it just sounds like blocked or something.

hopefully someone can help cause im out of ideas.

[89CAL]

Massive restriction on intake side or massive leak on pressure side. If you've already checked that the wastegate is functioning and the turbo is spinning then has to be one of these

Could also possibly be an exhaust gasket. Did you replace them with new items when you put the new turbo on? (T3 flange gasket will cause more problems then the dump pipe gasket)

[RamR33]

the only thing i have done diff from the stock turbo and intake and pressure side is for the intake to turbo put a 3 inch to 3inch rubber silicone hose which on the stock one i had 3inch to the turbo intake 2.5inch and from the other part that goes to intercooler is a 90 degree bend which ofcourse the factory one wont work and i put new gaskets,bought a gasket kit from autobarn.

the turbo does spin freely and nice with my fingers but cant reall see if its spinning on idle without the front intake coming off and then wont idle ofcourse without the intake/afm.

anyway around seeing if the turbo spins on idle withouth the intake with afm that goes to turbo?

[75coupe]

what turbo is it?

Where did you get it?

Was it brand new or used?

Did you use new gaskets on the exhaust side?

Are you sure the wastegate is sealing, has it got enough preload on the wastegate?

[RamR33]

the turbo is brand new WS-0448 Turbo straight bolt on one.

i got new gaskets for the exhaust manifold and dump pipe.

[75coupe]

whats a WS-0448???

where did you get it?

was it new or used?

[RamR33]

i got it from ws racing on ebay,the brand is ws racing and it is brand new, heres a link

Edited September 21, 2011 by RamR33

[75coupe]

have you adjusted preload?

how did you set preload?

[RamR33]

i kind of put on the actuator rod tight on to the wasgate pin thingy as in adjusted the rod so it can hook on but made it tight so i have to pull the rod a couple of mm to hook on as thought it would close the waste gat flap as i as told.

is that wat you mean by preload or is it something else?

[75coupe]

yep thats preload, do you know what pressure you actuator operated at when you blew air into the actuator line?

[StealthX]

It wouldn't be actuator related. cos if the actuator was blocked, it would overboost.

does it sound like the exhaust is leaking?

what boost gauge are you using? stock? aftermarket? is it hooked up correctly?

double check your BOV. if the BOV was somehow forced open it would recirculate all the air straight back to the turbo.

you can take the AFM off and blow through it, the car will run like shit but you'll be able to see if the turbo spins. just blow lightly like idle.

try to post a pic or vid.

[75coupe]

if the wastegate was too soft though wouldnt it just blow open, hence no or low boost..??

[KEBAB_DRIFTER]

rear wheel still on the turbo?