GabeFD3s

So ive been having a wierd issue for a while now, Ive read up a ton on EBC and wastegates and keep seeing you should be able to at least double spring pressure with a boost controller.

I am running this wastegate http://imgur.com/gHlucwVconnected to an older style Blitz boost controller http://www.jankuyado.com/TM/BAR1749/PA191676.JPG which only has a gain option on the unit, as well as the "low & high" **** which I assume are duty cycle ? The problem im having is im currently running the (15.6-20psi) bar spring. If I turn the High *** all the way to the right it will barely reach the spring target, usually opened full well before the rating of the spring around 13psi, if I turn it down it opens sooner the more I go down which I thought wasnt popssible as from what I read I always saw the pressure will not go below the designated spring rating ?. I am wondering why the pressure is not exceeding the spring as the way Im seeing it the EBC is doing nothing but letting me open the wastegate sooner ? Pardon my awesome paint skills but this is how I have it plumbed at the moment and it seems correct! http://imgur.com/yH2DqHT

Any help would be appreciated as its driving me nuts, I do have a 20-24psi spring I just bought that I have no put in yet. I had the car running previously with an adjustment bolt on the wastegate which compressed the spring to about 21.5psi @ 85% injector duty cycle with water meth, which is roughly my target. The bolt now broke so I thought id finally try to figure it out. Running a streetport w/ single Borger warner s366, power fc with commander.

Rob XX 7

iTrader: (8)

when the bolt broke did you check the diaphragm?
do you have a manual controller you could throw in there for a test drive?

RXSpeed16

iTrader: (41)

Bypass the controller and attach the signal line directly to the wastegate.
The controller cannot make the wastegate open sooner.

Vicoor

The wastegate works by applying pressure to the lower side of the diaphragm. When this pressure overcomes the tension of the spring, the wastegate opens.

The boost controller works by applying pressure to the topside of the diaphragm, "assisting" the spring holding the wastegate closed.

So no matter what you do with the boost controller the lowest pressure the wastegate will open is determined by the spring tension.

It sounds like the spring you have installed is not as heavy as you think, or there is something mechanically wrong with the wastegate that is preventing it from closing properly, or possibly an exhaust leak before the turbo preventing the turbo from spooling properly. I guess it could even be a boost leak or restriction in the intercooler so that the pressure from the turbo can't make it to the mani

As suggested previously, the first thing I would do is route the pressure tap on the turbo directly to the wastegate lower chamber and see what boost pressure you get.

GabeFD3s

I think ive figured it out! The top of the wastegate had a hole opening where I had my adjustment bolt that broke off. I sealed the top of the wastegate with Jb quicksteel and it now boosts to full spring pressure, Also when I turn down the boost controller it allows the wastegate to open sooner then the full spring pressure. The spring rating is from 15-20 psi so it effectively lets me open the wastegate at 15 or 20 psi. I am still not able to go higher than the spring rating with the boost controller, but at least it does reach the spring rating at the moment.