Jesuscookies

iTrader: (1)

Okay,

I have a blitz wastegate (same as a greddy). Anyways, I was trying to adjust boost on it using the screw on the top of the WG. However, no matter where I adjust the screw nothing changes on my boost. What I am thinking is that the top piece (or metal cup) that goes over the spring, inside the WG is missing. So, basically the bolt cannot add tension by pushing down on the metal cup. It adjusts nothing.

My question is this. If I hook up my electronic boost controller. Will it also not be able to control boost because the metal cup is missing? I.E. does the WG need that cup to adjust boost with an electronic boost controller?

As a reference, I have 2 ports on the wastegate. One has a stainless steel braided line that runs directly from the side of WG to a hole that has been tapped into the compressor (cold) side of my turbo. The second port on the other side of my WG is a silicone hose running directly to the out port on my boost control solenoid. The in port on my solenoid is running to my intake manifold.

Any help is greatly appreciated.

C. Ludwig

iTrader: (27)

Yes. The controller will increase boost by allowing a metered amount of air pressure on the spring side of the diaphram. That effectively increases the spring pressure and boost as a result. Should be an easy matter of removing the diaphram cover to see what's wrong/missing causing the tension screw to not work.

maxcooper

I have never really understood the spring pre-load stuff that you can adjust on the wastegate. I'm not sure it is really meant to adjust the boost level -- perhaps just how sharp it responds (i.e. soft or spikey) or something. I don't think it will affect your ability to control boost with the EBC.

It sounds like you do have the EBC hooked up correctly. Some solenoids have more than two ports, but it sounds like yours does not. And some EBC controllers have a setting for whether to increase or decrease the duty cycle to raise boost -- that is worth checking on (might be DIP switch settings). Is it a Profec B of some generation? I think GReddy has all the plumbing and DIP switch setting diagrams available online.

-Max

Jesuscookies

iTrader: (1)

Thanks Max, and Dcrosby, who actually spent some time on the phone explaining how this works. My EBC is a blitz dsbc spec R. There are 2 switches on the back of the unit (AC or WG). I do not understand what they are or what they mean, but I am assuming this is what you are referring to with duty cycle? The instructions say to use WG for my particular setup. I looked on the solenoid and cannot find a 3rd port that vents to the atompsphere, so my guess is that this EBC controls boost by adding pressure, not bleeding pressure? Is this bad?

I am going to bust out the mityvac, and see if I can get the EBC to do something. I will post my findings.

maxcooper

The two setting options almost certainly mean:
WG: increase duty cycle to increase boost
AC: decrease duty cycle to increase boost (AC probably means "actuator")

WG is the right option for your setup.

It is okay that it only has two ports. The vent is probably internal or simply not a port that you could attach anything to. The wastegate itself still works the same way.

Supply pressure to EBC's boost sensor. The solenoid will probably start making noise when there is a little pressure (~1 psi?), and it should stop making noise when you exceed your set boost level (>15 psi? -- depends on what it is set to).

How about just driving the car to see if you can control the boost with the EBC? If you are concerned about damage, you could richen up the fuel maps temporarily and set the boost level in the PFC such that it would cut out if you overboost (= you set the desired boost level, and it cuts at 20% over the setting or something like that).

You have it all hooked up correctly. Any issues should be quick to resolve if it isn't working properly when we start dyno tuning. As a backup, you could bring a simple ball-valve controller if you are really worried about it.

-Max

Jesuscookies

iTrader: (1)

Yep, you pretty much hit it on the head. I decided not to try and test by running the car. I still may, but something about melted apex seals just did not sit right with me. Also, at this point I am comfortable that it works, and is hooked up correctly.

I am hoping you are correct about the 3rd port not being visible, but my guess is that this particular EBC controls boost by adding pressure?

We did run a mityvac to the solenoid, and tested it at the various settings. However, it does not open at 15PSI. Since the car was not running, and the WG was not seeing any pressure or boost, we were only able to see the difference in the settings on the EBC by using the mityvac.

maxcooper

Blow through the port on the solenoid that is connected to the top port on the wastegate. I suspect you will hear air venting from the solenoid.

The solenoid controls pressure in the top of the wastegate by adding air. But if there was no vent in the volume/chamber that the air is added to, it would be impossible to reduce the amount of pressure in the top of the wastegate while you are still under boost (it could get no lower than the currect boost pressure -- there must be a vent to go lower!). Typically, the boost controller will add pressure to the top of the gate to keep it closed for spool, and then it will reduce the pressure and maintain a level that will give you your programmed boost level after the turbo is spooled.

I don't want to freak you out if you don't find the vent, though. You clearly have it connected the way that the EBC manufacturer intended, so it should work fine when we hit the dyno.

-Max