Wow, i thought when you disconnected the vacuum line to the waste gate, you got spring pressure, somthing like 14 psi or so. I got 30 PSI. Am i confused or do i have a problem???? Ray

 

no you did not

 

wtf 30 psi??? i dont think on pump that could have happened without damage

 

how can you get 30psi? do you not have a fuel cut/boost cut?

 

ha, if you have no boost source going to the wastegate, how do you expect it to open?

 

That's how it is suppose to work. No vacuuum, no open.

 

Nope, thats the way its supposed to work.. the actuator uses boost pressure against the spring to open the wastegate.. As you reduce the signal, the boost raises.. Removing the signal altogether with no longer bypass exhaust gas away from the turbine (until there's so much pressure it forces itself open) but I think 30psi is the actual max flow limit of the turbine anyway I don't think the exhaust can spin the wheels any faster due to the mass of the rotating components...

 

Yup Jack is right. And that actually happened to me last night, I put the boost line from my BC to the WG on the top of the Tial wg so it was going up to about 25ish and I shut down right away, I was supposed to put it on the side of the wg.

 

I have a spare short block waiting for ya for when you put a hole through yours

 

no pressure u mean.......?

 

We were data logging and were on top of it. No knock logged. We imediately let off. I guess i had it backwards. I thought the pressure to the actuator helped keep it closed and if you were only on spring pressure it would unseat the WG at around 14 PSI. We were trying to figure out why my friends car has extreme MAF fluctuations and thought it could be a weak waste gate actuator not staying shut.