turbo not boosting?

[Plug]

right got my turbo back from a rebuild and bolted him alll on and connected it back to the car but it doesnt boost now???

any ideas?

[Edd]

Jeeez you got alot of problems with your let lol

Should of got a smallblock :d

Actuator set up right ?

Vacum lines as they should be ?

[Plug]

I wish I did get a small block now or well atleast an xe lol

Every thing is connected up as it was and I've got about 5-10mm pre-load on the actuator

Going to take it off again I suppose and check it over :(

The only other thing I did was changed the spark plugs over to then NGk ones people say to use.

Do you think I should put the Bosch ones back in that where in it? They have 4 bent over bits where the ngk ones have one

[R1CH]

Do you have a boost gauge fitted, what does it read, on idle and whilst driving, plugs won't make any odds to it not coming on boost.

[Sloth]

is the turbo actually spooling?

[Plug]

It has a boost gauge but that doesn't leave -1 bar to 0 bar as far as I'm aware it's spooling as it does dump just doesn't do anything over 2k revs

[Stuart]

just for a test drive, take the boost line off the dump valve (block the little hose obv)

[Plug]

I'm still using the standard kkk dump valve. So I take the hose off and block them both off?

Also a few people have told me to bypass the Amel valve is this ok to do?

[Plug]

:(

[Dom]

Are you sure you havent got any splits or small leaks on any of the boost pipes? With it running spray WD-40 round all the boot pipe joints to see if the revs rise if they do you have a leak.
And if you join the 2 pipes going to the amal valve it should just carry on boosting worth a try if you cant find any leaks.

[Plug]

will have a lookie tomorrow any more ideas would be good and save me taking it off :(

[R1CH]

I take it your oil pressure prob was actually ok then eh ?
Best bet is to go back and check all the pipe work, make sure theres no holes and that everything is tight, check intercooler ect ... is the wastegate valve ok, not stuck open or anything ?

[Plug]

waste gate moves freely,

Oil pressure is fine yea as soon as i took the plugs out and turned it over after an oil change it was coming out of the turbo :)

Will check all the pipes, maybe whip them all off and start again, think im going to bypass the amel valve aswell.

[Benn]

So when you put your foot down the boost rises on the gauge yes?
But wont get over 0?

[Plug]

correct it wont even get up to 0

Its not the actuator thou as i move it and its exactly the same

[Benn]

Can you hear the turbo spool up? As you could be able to... You need to make a vid of the boost gauge and the window open...

[Plug]

it does sound like it spools up but it doesnt much :( over 3k its like a diesel

i dont really want to drive it as it is benn tbh as i dont want to break the turbo :(

Going to whip off all vac hoses and boost hoses tomorrow and restart

[Plug]

right ive removed all boost pipes and put them all back on making sure all connections are tight, With the car running sprayed them all with wd40.


Ive noticed the silicone hose coming off the intercooler inlet side is collapsing when reved.

Im guessing this means the turbo isnt spooling as them pipes should be under pressure?????

Any ideas?

also just for now ive linked the 2 pipe outlets on the amel valve and the turbo to actuator just to bypass it

[General Baxter]

wip the turbo back off, and make sure the inlet blades are connected to the exhaust ones

^ sounds tech honest lol

[Plug]

well im guessing the turbo peoples would have done that wouldnt they?

i had to have a new compresser wheel on it

[General Baxter]

you never know lol

[Plug]

hmm ok i will check

am i right in saying the pipe should be under pressure and not collapse thou?

[Benn]

Sounds a bit odd, but i know Zlets suffer from that quite bad, that's why they all run the hard boost pipes..

When your making boost there should be pressure there. If its just idling it wont be as hard, but it should be collapsing tho.

[General Baxter]

you getting a mega vac, theres no boost at all,

[R1CH]

Whats the air filter like, size wise, will it flow enough ? Its not blocked is it ?

[Plug]

piper cross foam thingy i've taken it off and try'd it does the same

[General Baxter]

i take it when you rev it, the gauge fooks off into the -vac ?

[Plug]

gauge stays in -vac

[General Baxter]

but does it get worse under load ?

[Plug]

yea

[General Baxter]

working your way down the air system

remove air filter, put hand over pipe, rev it, does it give you a love bite? if not, work your way down to the next join, and so on,

past the turbo, try there, then the intercooler, then the otherside, ect:


find that blockage, i bet its the turbo lol

[R1CH]

How was the turbo packaged when you got it back ? were all the inlets / exits all capped off ? something hasn't gone into the inlet side has it, paper / bubblewrap or summet ?

[General Baxter]

if theres no bubble wrap there, check the inlet side of the cooler lol

[Plug]

the turbo came in a sealed bag in a box full of polistirine (sp?) it didnt have anything blocking any of the holes up.

What you mean baxter check the inlet side of the cooler?

[General Baxter]

bubble wrap might have blown down into the cooler lol

its simple ether the turbo is not boosting, or theres an airblock

[Plug]

how i get rid of an airblock?

anyone want to buy a let? lol

[Adam]

So let me get this right, it sits -vac on idle, as it should, goes up to around 0 when driving, but never reaches + pressure (boost) ?
And this is a newly rebuilt turbo?

[Plug]

the turbo has been fully rebuilt and had a new compresser wheel fitted aswell.

I havent even done a mile with it yet, only driving up the road and realising theres no boost so reverse back down.

yes it never hits + vac

also seeing the pipe collapsing is making me think that the turbos not spinning up as it should be pressureised(sp?)

[Sloth]

correct you have a blockage, so the engines sucing all the air out of the intake pipes thus flattening them. strip the lot dowm and check. it may also have a collapsed ic core....

[Plug]

hmm i tryed taking the IC off today and it didnt want to lol think the hoses where glued on there :(

Will have another crack in the morning. well i have only got an hour really thats if im up at 7 :( haha

I think sunday is going to be a mass get this god dam car working spree

So we have come to the conclusion its either a blockage between the turbo and inlet or the turbo isnt spinning?

[Sloth]

yus. as for sticky pips, steal your mums pallet knife and push it between the pipe and cooler. then run it all the way round. :)

[Plug]

Right so im thinking the turbo place wouldnt send out a turbo that the compresser wheel isnt working on so the air block sounds the more reasonable one.

Will try and whip the cooler off tomorrow, How do i see if its blocked? Blow in it? lol

[Sloth]

lol yeah. or looks for blockages in it.

[General Baxter]

before you take the cooler off,

remove the pipe from the turbo to cooler, then see if the pipe sucks in again,

this would means theres a blockage in the cooler

[Plug]

yea but it wont run then baxter lol

Or will it if i leave the AFM connected?

[General Baxter]

connect the AFM to the other bloody side, dumb ass lol

[Plug]

huh? thought the afm had to go before the turbo

the wires wont reach the other bloody side lol