Right i just want to know where to take my vacuum feeds from for the turbo. There's two barbs on the turbo for vacuum, one on the actuator, and one on the wastgate?

i presume the wastegate one goes straight from a vacuum on the inlet manifold but i'm not too sure about the actuator one?! same place?!

silly question i know

 

they're pressure feeds really, rather than vacuum, but anyway....

you connect the one on the compressor housing (sorry if this is patronising, but thats the silver aluminium 'snail' on the turbo) directly to the one on the actuator.

this will give you a basic form of boost control, depending on the spring rate inside the actuator, and the pre-load on it (how much you've tightened the rod between the actuator and the wastegate).

how it works is that when you get pressure in the compressor housing (positive boost pressure) this will push on the diaphragm in the actuator. when you get enough pressure to overcome the spring and the pre-load, the rod will start to move and open the wastegate. this makes more air bypass the turbine side of the turbo and keeps the speed down so that it produces less boost. you then have a closed loop system.

be aware that you should first attach the actuator rod to the wastegate with the minimum pre-load possible, that is 3mm. that means that the rod will not fit over the wastegate spindle by 3mm and you'll have to pull it on against the load of the spring. this will give you minimum possible boost so that you can check it and increase it if possible/necessary. depending on the actuator used, your boost may even be too high even at minimum pre-load, and you may have to change to a weaker actuator (for example, a -31 actuator is weaker than a -34).

some systems run a bleed off, either via a mechanical bleed valve, or an electronic one. this is to make it easily adjustable, to reduce the effect of a too strong actuator, or to give the ecu some control over the boost level.

hth.

 

so basically connect the two together?

i had a look at my mates turbo and he has 3 'pressure' feeds, one on the compressor housing, another one on the compressor housing on top of a removable cover (what's under there i do, and that's where mine is too) and one on the actuator...

his connects one form the actuator via his manual boost controller back to the compressor housing, then the one from the top of the cover on the compressor housing goes to the inlet manifold i think.

 

there's no need for one to go from the compressor to the inlet manifold - they're connected anyway via the rather larger air pipe.

just connect the 2 together, but if you have another hole somewhere, make sure it's blocked or the turbo will overspeed and fuck up.

post some pics of the cover thing, i have no idea what you're talking about.

you don't think you're being a bit ambitious here? i know you've got to learn somehow, but a bit of research before you started building all this wouldn't have been a bad idea.

 

nah i turbo'd my civic but that had an external wastegate etc, i just don't have too much of a clue about the actuator/internal wastegate setup.

I know it's a silly question, hence why i said at the start..... if you don't know ask.. consider this the research lol not as if i needed to know this at the start anywhooz

 

http://brickboard.com/FAQ/700-900/Im...GarrettT25.gif

you see how the actuator is connected to the compressor housing, well i don't have one there on the compressor housing, just the other one you can see at the top off the pic on top of the extra 'housing' if you like.

 

This thing on the side of the intake to the compressor is acually integrated recirculation valve. It's Escos T-25. You can either blank it off or use it by connecting it toinlet manifold if you don't have BOV.

 

cheers!

i should have known that's what it was as my mate has one on his!

Still don't know where i'm going to put the actuator one though, if that's the case?

 

You schould feed pressure from the compressor housing to the actuator. BOV you schould feed from the inlet manifold.