Forge actuator = no boost wtf?!?

[wotagr8bigchief]

My ibiza was losing boost all over the place, spiking 1.5 bar but dropping to .7 almost straight away so i assumed it was the actuator and promtly ordered a new Forge one. Upon removal of the turbo (ko3s) it was clear the actuator probably wasn't at fault as the hot side was riddled in large cracks to the point I'm suprised it made ANY boost. Had a spare k03 with a perfect hot side so swapped them over and thought i may as well stick the new forge actuator on seing as I had it now. So I counted the threads on the old actuator and match it with the forge, warm it up and take it for a test drive expecting it to be hitting 1.5 bar and holding at-least 1.3 and I get .5-.6 at best!!!
At first i thought this must be an electrical problem, sensor not connected or something so I crimped the pipe from the N75 to the actuator and boost is exactly the same?
I then decide that I must of miscounted the turns on the actuator so I adjust a few threads and sure enougth it boosts a little higher. I have now got all the way to the furthest inside thread on the actuator and am now hitting .9-1.0 bar, thing is I'm now out of adjustment! Am I missing something here? Anyone else got any experience with this?

Cheers

 

[Seatmann]

Try disconnecting the pipe to the actuator and see if you get boost, there's not much to the wastegate turbo and the only thing it could be regarding that would be the wastegate is open for some reason. It sounds like the actuator isn't the right one though and you'd be better trying the old one back on.

 

[wotagr8bigchief]

Try disconnecting the pipe to the actuator and see if you get boost, there's not much to the wastegate turbo and the only thing it could be regarding that would be the wastegate is open for some reason. It sounds like the actuator isn't the right one though and you'd be better trying the old one back on.

I disconnected the actuator from the n75 and it made no difference at all! must be an electrical fault then i suppose?

 

[James.Judd.1]

something wrong with the turbo/ wastegate flapper. If you have disconnected the actuator pipe the turbo will be uncontrolled and therefore spike about 30psi or something mad

 

[ibizacupra]

you sure the wastegate is actually being held closed by the actuator?
what spring actuator did you buy???

 

[James.Judd.1]

Bill, if the wastegate was being held closed it would overboost? His problem is lack of boost..

 

[jasso86]

limp mode perhaps

 

[wotagr8bigchief]

Think I've sussed it, no fault codes coming up so i'm gona try a bleed valve tommorow and see if that works.

 

[ibizacupra]

Bill, if the wastegate was being held closed it would overboost? His problem is lack of boost..

lack of boost from open actuator??