1ggte single turbo not boosting, (standard ecu)

[Rota]

Hi guys hopefully there is someone here that can help.

Recently i put a boost controller on my gen 3 1ggte and one of the vac lines got hot and split resulting in 25+ psi which killed the stock turbos pretty quick.

I have now made up a Y pipe to single inlet for a aftermarket wrx turbo.
It is a AVO 450 and the bloke i bought it off was make about 240wkw on about 22psi on his 2.2l wrx. Reaching full boost by about 3500-4000 (I was shown the dyno graph).

Ok so here is the problem, the turbo has a 15psi actuator and it is only boosting up to about 7psi on my gen 3 1ggte. About 12psi if i pull off the vac hose to the actuator.

Does anyone know why it might not be boosting up to atleast 15psi, or 20+psi when the vac hose is pulled off? The actuator does "seem" to be working ok when playing with it with an air compressor.

Also we chucked a wideband O2 senson in the exhaust pipe and it was getting lean on the 7psi and was rather lean (13.5+) when it was hitting 12psi.
The motor only has a standard ecu and injectors but i have read that a few people on here were getting about 195rwkw out of it with a big single befor having to upgrade to aftermarket ecu and injectors.

So far the plan is to take it into a dyno this week sometime if i can and have a propper look at it, but i though i would ask here first to see if there is anything obvious that i am missing?


Cheers for any help.

[pandaah]

you must have some sort of exhaust leak preventing exhaust gas from spooling the turbo

[Rota]

It does have a smallish leak at the moment.
When i slapped it together i didnt have any manifold and turbo gaskets, i just used gasket silicon, but i will try and get some gaskets this arvo and see how it goes.
I just didnt think that a small leak would have that much of an impact? Although i would be stoked if it was just that

Also does anyone know why it would be leaning out? Is there anything special that people have done to get 195rwkw out of the standard ecu and injectors?

Cheers guys

[Z2TT]

you must have some sort of exhaust leak preventing exhaust gas from spooling the turbo

That will have to be one big leak.

[eeeyan]

I know its not toyota but a LONG time ago i had a cordia and had a similar problem with it not reaching full boost the problem turned out to be an ever so small crack in the manifold and it wasn't getting all the exhaust it needed. 10 seconds with the welder problem solved. I'm not saying your fab isnt good but i would be leaning towards exhaust leak too.

[Rota]

I can easily hear the exhaust leak, so i guess it is relatively big.
I have been taking the dump and turbo off and on a few times and i can see carbon seeping through the flange connections, so first of all i will put in some gaskets and see how i go.
After a bit of searching on the net it seems that even a smallish leak will give a noticable loss in boost and power.

If that doesnt fix it i will look to the y pipe i made (allthough it is thick steam pipe and i have used allot of amps with the arc welder for pentration.)

Also i spoke to the guys at turbotech yesterday and they seem to think the actuator spring may be broken. So once the exhaust leak is fixed i will try wiring the actuator closed and see if that gives me a large boost spike. Then work backwards from there.

[eeeyan]

sounds like a plan try all that and if u still have troubles well... i can talk to a mate who just got a y pipe for his 1G and see if he's willing to see if it works on yours to diagnose if its the turbo or soemthing but try your solutions first.

[SillyCarS]

I can easily hear the exhaust leak..

After a bit of searching on the net it seems that even a smallish leak will give a noticable loss in boost and power.So once the exhaust leak is fixed i will try wiring the actuator closed and see if that gives me a large boost spike...

Then work backwards from there.

hey mate

welcome to the forums, i must say, thats a real doozy youve got there. really got me thinking for a while so i had a look around on the net myself for you

try this link i think it will put you in the right direction

clicky

[Rota]

hey mate
try this link i think it will put you in the right direction

clicky

Hahaha cunny funt

[Rota]

I just thought of a reason why it might be leaning out.

My 1ggte afm is stuffed so i pinched a mates 3sgte afm (looks identical). I plugged it up and it sounded and ran exactly the same as with the 1ggte afm so i assumed that it was the same item pretty much.
Does anyone know if the 3sgte afm's give a different reading to the 1ggte ones?
I will check my old one on the weekend but if someone allready knows it would save the hassel.

Cheers

Brad

[SillyCarS]

i would say theyre theyre the same assuming theyre callibrated for a 2L motor, will be interested to see what u find. too bad i didnt know a fortnight ago i just threw a heap of that 1g shit out

[eeeyan]

fix the exhaust leak and see if it improves would still be a big step forwards

[pato]

how do u know that the turbo is in working order ?
did u get it checked ??

when i did my bigend, i took the turbo down and mtq and gcg turbos in sydney. when it came out of the car it was working perfectly,

$1000 later it was repaired

them bearing kits are tempremental fuckers, especially seeings u dont kno where the turbo has been, or what it has done.

[Rota]

how do u know that the turbo is in working order ?
did u get it checked ??

Well the turbo looks to be in good condition cosmetically. There is no in and out play of the shaft. The shaft spins freely. There is no nics on either of the wheels and it doesnt make any strange noises.

I havent had a chance to fix the exhaust yet, I am saving that for the weekend when its 42 degrees hahaha. But once thats done i will report back.

Also i am considering getting a cheap garrett 32mm external gate for this setup. Does anyone know if it will be big enough. I am hoping for the 330rwhp area at some stage.
Also will i "have" to weld the old internal gate shut. Or can i just wire it closed for a while?

[pato]

neither did mine,

i could blow it and it would spin for ages