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Installed New Turbo And Can't Get Boost?

JET-25L

By JET-25L,
in Engines & Forced Induction

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JET-25L Proficient

JET-25L

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Yeah a mate just suggested it might be the cat blocked.... my dump front and cat are all welded together... i checked the other end of it when i pulled it off the other day and it seemed alright.. i had to turn it upside down and bang it on the concrete and the old turbo wheel and sh!t came out but maybe it did more damage?? completely blocked it up?? That would make it have massive backpressure and not be able to spool up right?

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89CAL Grand Master

89CAL

Posted
Posted

didnt think of that, could have leftovers from the old turbo lodged in the cat

anyways as someone already said... and i know its simple an more then likely not this, but is ur boost gauge connected properly? i.e when under vacum the hose is sucking itself into a sealed position on the back but then when it makes boost its blowing off so that its not sealing.

dare say that blockage in the exhaust is a good one

Granthem Mentor

Granthem

Posted
Posted (edited)

If the wheel has hit the honeycomb material in the cat there is a fair chance its done some damage. It can very easily collapse and be pushed to the rear of the cat where it becomes lodged.

Cut the cat off, fair chance your problem could be lodged there :)

Edited by Granthem
JET-25L Proficient

JET-25L

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ahh well i just spent a few hours pulling the dump and cat off... i smashed all the honeycomb out and stuck the hose through it (closest thing i could find) and the nozzle came out the other end of it... so there's no restriction in that.. and the side of the cat i could see (catback side) was fine.

Started the car up.... no difference... same thing...............................................................

Dammit!

NWR31 Collaborator

NWR31

Posted
Posted
ahh well i just spent a few hours pulling the dump and cat off... i smashed all the honeycomb out and stuck the hose through it (closest thing i could find) and the nozzle came out the other end of it... so there's no restriction in that.. and the side of the cat i could see (catback side) was fine.

Started the car up.... no difference... same thing...............................................................

Dammit!

sorry to hear that, did you check/try to tighten the comp wheel while you had the dump off?

vinnie32GTS4 Mentor

vinnie32GTS4

Posted
Posted

i know this might sound a tad silly as its so bvious but have ya checked the exhaust wheel coz without one you wont be makin boost?? or ur exhaust wheel may be damaged so its not makin boost??

just a suggestion

JET-25L Proficient

JET-25L

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  • Author
Posted (edited)

I was actually in such a hurry to start it up with the cat hollowed out that i started bolting it back on and forget to look up at the exhaust wheel... but it will be the same as it was when it was off a day before... yes there is an exhaust wheel.... i've also though that... coz i had to drive home when i blew the old one and yeah kinda feels the same... just not pouring smoke out like it did with the blown one.

The front wheel on the old turbo had 2 blades that were very slightly chipped... i'm not sure if that was done at the same time or if it was from ages ago... I don't think that would have done much though?? What do you's think??

I just can't accept that it's the turbo... it's 100km old (then previous car got written off) and looks immaculate/spins really well... the wheels aren't rubbing on the housing or anything... no noises... I'm at witts end with it I don't know whether to just take it to a shop or...

Here's the turbo...

ee8d_1.jpg

ef56_1.jpg

Edited by JET-25L
JET-25L Proficient

JET-25L

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Err no it doesn't... that's a steel wheel and you can tell it's been highflowed and bored out because both the wheels are way bigger than standard and on the standard turbo there is a raised edge around the exhaust wheel... whereas this one is level.. only way they can do it without changing housings.

JET-25L Proficient

JET-25L

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Is it even possible for the exhaust wheel to be spinning on the shaft?? That can't even get tightened by the looks of it.. If it can I have no idea how to anyway.. If i try and spin the front one way and the back the other it doesn't work... and there's no up/down side to side play or anything like that so...

Blocked intercooler from blades of the front of the old turbo???:s

NWR31 Collaborator

NWR31

Posted
Posted (edited)
Is it even possible for the exhaust wheel to be spinning on the shaft?? That can't even get tightened by the looks of it.. If it can I have no idea how to anyway.. If i try and spin the front one way and the back the other it doesn't work... and there's no up/down side to side play or anything like that so...

Blocked intercooler from blades of the front of the old turbo???:s

from what you said the old turbo comp wheel didnt break apart so that shouldnt have blocked up the cooler. oil from the old turbo can block it up if seals went.

where does your boost gauge get its pressure signal from? before the cooler or after?

no its not possible for the turbine/exhaust wheel to spin on the shaft, but it is possible for the comp wheel if not torqued/assembled correctly to spin on the shaft.

Edited by NWR31
Angus Smart Grand Master

Angus Smart

Posted
Posted

take the turbo off, and take it to someone who fixes them or can have a look. i would be able to suggest someone here in sydney/woolongong. but your in townsville.

if the turbo spins freely when it was out of the car, and everything has gone back on correctly

its either going to be something very very silly. or as people have said the turbo isnt right..

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