not making the boost

[SCHWARTZ]

Fitted an escort cosworth actuator (think -31) but Im only getting .5bar (7psi) boost.:scratch: the actuator is taking the feed from the comp housing and I'm not using a bleed valve (did fit one but it made no difference). I made an alloy bracket which does flex a bit is it poss that that is causing the gate to creep? The actuator has a fair bit of preload but still won't hold the boost is like. I have checked for air leaks but can't find any I will pressure test the system at some point to check. Also the gasket between the mani and the turbo is slightly leaking could this cause a problem?

[THE MASTER]

rig up a pressure setting tool . parts needed are a boost gauge a pump and a T piece and a few pipes

rig it up so that its a sealed sys one end of the pipe is on the acctuator the other is on the pump T off so that the boost gauge is in there aswell

pump the pump and watch the acttuator. when it starts to move read off the pressure needed to make it move.

that should be the presure that the turbo is controled to or near abouts

if your way under the pressure setting when driving start looking for any leak in the boost sys

[SCHWARTZ]

That's the sort of thing I was thinking, good idea. I will get on that when I have some to work on the car again.

[SCHWARTZ]

Right havnt had time to pressure test the system but did fit a bleed valve in line (rather than the old in car) from comp housing to actuator. At fully open so max boost it only made .8bar so slightly more boost but something is defo up. Could slight flex in the bracket cause cause this? I think there must be a boost leak somewhere but it idles so well its strange.:scratch:

[adscan]

Have you checked the breather pipe on the back of the turbo pipe? Mine was down on boost because of this.

[TrixNFlix]

Gary, you realy need to pressurise the system, you might be surprised at how many leaks there can be.

[5 turbo]

Adjusted the act propper :p :wasntme:

Sure the wastegates fully closed..assuming its still an internal...

Intercooler Good?

Long chalks :agree:

[Logg]

I think you answered your problem in your first post. You've have an actuator bracket that you can flex I'm sure under load of boost it'll be flexing much more. Had the same issue many years ago.

[SCHWARTZ]

I know I need to check for leaks as I'm loosing boost somewhere, when I get some time that's the 1st thing I will do. Can boost really force open the wastegate that much?
I have about 10mm preload that should be plenty, the bracket didn't flex more than that but I will look at strengthening it. Cheers lads looks like I just need to pull my finger out and pressure test it and go from there.:cooter:

[5 turbo]

I know I need to check for leaks as I'm loosing boost somewhere, when I get some time that's the 1st thing I will do. Can boost really force open the wastegate that much?
I have about 10mm preload that should be plenty, the bracket didn't flex more than that but I will look at strengthening it. Cheers lads looks like I just need to pull my finger out and pressure test it and go from there.:cooter:

Gotta be running some monster boost/or a **** actuator to force wastegate open..

was the act a newun/proven good?

if all else fails i would have a look at the penny washer(wastegate flap) just to be sure its closing fully..long chalk but if its an old housing its possible its distorted allowing gas past thus lowering pressure., also give the carb a check over for leaks :agree:

[SCHWARTZ]

The actuator feels like it has good tension still, its hard to pull out even tho it is not new. I'm sure it must be an air leak somewhere, also its a b18ft so no carb but I will be checking inlet gaskets etc..

[5 turbo]

The actuator feels like it has good tension still, its hard to pull out even tho it is not new. I'm sure it must be an air leak somewhere, also its a b18ft so no carb but I will be checking inlet gaskets etc..

Hmmmmmmm.

work through all the suggestions above, after that might pay to give the turbo itself the once over again if not a newun just to be sure no cracks in the housings or elbow..

give the entire intake system a check, from the filter to the head and all ancilliaries...sure its all plumbed up good on the vaccum side of things..is the gauge good??

the suggestion as to pressurizing the system would be my route first :agree:

[SCHWARTZ]

Pressure tested the boost system and all is good. I did however find a ****ing huge crack in the manifold:sad2: had it made by big Jim log type bout 1.5 years ago. Looks like the weight if the turbo killed it. Welded it up with a bracket and Gona make a brace off the gear box, hopfully no more boost problems:wasntme:

[5 turbo]

Pressure tested the boost system and all is good. I did however find a ****ing huge crack in the manifold:sad2: had it made by big Jim log type bout 1.5 years ago. Looks like the weight if the turbo killed it. Welded it up with a bracket and Gona make a brace off the gear box, hopfully no more boost problems:wasntme:



Good to hear its hopefully sorted now :agree: